So I have realised there's no mutex on the timer which is not great. The main problem is in LoadTimesTrace() for reporting.

I have a solution on hand.. keeping the lock to an absolute minimum for the LoadTimesTrace().   (lock, copy, then unlock and work on the copy).

I wonder if skipping just the tracing of those control Rx  frame types is going to cost more than it saves.  The timer starts even before we know which control signal we are decoding and then it's all integer operations, a std::map lookup (integers only) and an integer smoothing.
I guess I could check for that one message type and then filter the frame.. however if those frames are not going to be examined - we would be better off skipping the queueing of them and keep it simple.

If we do something like this:
void OvmsPollers::PollerRxCallback(const CAN_frame_t* frame, bool success)
  {
    {
    OvmsMutexLock lock(&m_filter_mutex, 0); // Don't block! (ever)
    // If not locked, just let it through.
    if (lock.IsLocked() && !m_filter.IsFiltered(frame))
      return;
    }
  Queue_PollerFrame(*frame, success, false);
  }
and blocking-mutex the calls to change the filtering...  then the worst that happens is that a few frames get through while we are modifying the filtering.


//.ichael

 

On Sat, 18 Jan 2025 at 17:08, Michael Balzer via OvmsDev <ovmsdev@lists.openvehicles.com> wrote:

I have commented out the line with the Atomic_Increment statement. Now I no longer receive any messages with “RX Task Queue Overflow Run”
Here is the output of poller times status:

The main question is if you still get the CAN bus crash (vehicle running into issues) with that modification in active mode. Timing statistics were not expected to change.


Nearly 2800 frames per second is quite a lot, and most is on can1 with many frame periods at 20 ms. Yet the total processing time averages at 30-40 ms, so there is no actual CPU capacity issue for that amount of frames.

@Derek: can you please supply these statistics for the Leaf in drive mode as well?


Am 18.01.25 um 02:42 schrieb Michael Geddes via OvmsDev:
Maybe try setting CONFIG_OVMS_VEHICLE_CAN_RX_QUEUE_SIZE = 160   and see if that reduces the overflow?

Simons car sends at least 91 process data frame IDs on can1 and 84 on can2. Worst case would be these come all in within the shortest possible time span, that would mean the queue needs to be able to hold 175 frames. I'd add some headroom and round up to 200.

But keep in mind, if the Incoming processing actually occasionally gets blocked for up to 60 ms -- as indicated by Simons statistics --, the queue may need to be twice as large.


Am 18.01.25 um 02:42 schrieb Michael Geddes via OvmsDev:
 I was thinking that the frame filter would be here:
void OvmsPollers::PollerRxCallback(const CAN_frame_t* frame, bool success)
  {
  Queue_PollerFrame(*frame, success, false);
  }
which I guess is executed in  the task handling the CAN queue.  (we don't know how many frames get dropped there).

Actually we do know that, or at least have some indication, as we count the CAN transceiver queue overruns. That info is included as "Rx overflw" in the can status output & as "rxovr" in the logs.

Adding a filter before queueing the frame would exclude the filtered IDs from all vehicle processing. I meant adding a filter just to exclude IDs from the timing statistics, assuming those are the culprits, as Simon wrote the issue only appears after enabling the timing statistics and printing them. That's why I asked if printing might need to lock the statistics for too long in case of such a long list.

Completely blocking ID ranges from processing by the vehicle should normally not be necessary, unless the Incoming handler is written very poorly.


Yet, if we add that, a mutex in the CAN RX callback must be avoided, or would need to be non-blocking:

The only real concern is thread safety between checking and adding to the filter - so the check itself might have to be mutexed.
void OvmsPollers::PollerRxCallback(const CAN_frame_t* frame, bool success)
  {
  // Check filter
    {
  OvmsRecMutexLock lock(&m_filter_mutex);
    if (! m_filter->IsFiltered(frame))
      return;     
    } 
  Queue_PollerFrame(*frame, success, false);
  }

A mutex like that could block the CAN task, which must be avoided at all cost. I introduced CAN callbacks for vehicles & applications that need to react to certain frames as fast as possible, e.g. to maintain control precedence, so cannot use the standard CAN listener mechanism (frame queueing).

The current poller callback use is OK, if (!) the atomic type really isn't the culprit, ie doesn't block.

So if (!) an ID filter needs to be added before queueing, it needs to be done in a way that needs no mutex. But I don't see an issue with the vehicle passing a fixed filter when registering with the poller/buses. The filter doesn't need to by mutable on the fly.


Regards,
Michael



Am 17.01.25 um 19:42 schrieb Simon Ehlen via OvmsDev:
The poller statistics can help you track this down, but you need to have at least 10 seconds of statistics, the more the better. Rule of thumb: PRI average at 0.0/second means you don't have enough data yet.

There were again many messages with “RX Task Queue Overflow Run”.
Here are the statistics of poller times status:

OVMS# poll times status
Poller timing is: on
Type           | count  | Utlztn | Time
               | per s  | [%]    | [ms]
---------------+--------+--------+---------
Poll:PRI    Avg|    1.00|  0.0043|    0.004
           Peak|        |  0.0043|    0.052
---------------+--------+--------+---------
RxCan1[010] Avg|   34.26|  1.6741|    0.015
           Peak|        |  1.6741|    1.182
---------------+--------+--------+---------
RxCan1[030] Avg|   34.06|  1.7085|    0.020
           Peak|        |  1.7085|    1.390
---------------+--------+--------+---------
RxCan1[041] Avg|   49.89|  0.8109|    0.016
           Peak|        |  0.8541|    1.098
---------------+--------+--------+---------
RxCan1[049] Avg|   50.00|  1.5970|    0.019
           Peak|        |  1.7154|   32.233
---------------+--------+--------+---------
RxCan1[04c] Avg|   49.92|  0.8340|    0.014
           Peak|        |  0.8933|    1.995
---------------+--------+--------+---------
RxCan1[04d] Avg|   34.43|  1.6211|    0.014
           Peak|        |  1.6756|    1.318
---------------+--------+--------+---------
RxCan1[076] Avg|   50.00|  0.8362|    0.024
           Peak|        |  0.8784|    2.185
---------------+--------+--------+---------
RxCan1[077] Avg|   50.00|  0.7837|    0.014
           Peak|        |  0.8083|    1.156
---------------+--------+--------+---------
RxCan1[07a] Avg|   34.31|  2.1870|    0.017
           Peak|        |  2.3252|    1.888
---------------+--------+--------+---------
RxCan1[07d] Avg|   50.00|  0.8001|    0.013
           Peak|        |  0.8434|    1.150
---------------+--------+--------+---------
RxCan1[0c8] Avg|   49.96|  0.8359|    0.013
           Peak|        |  0.8715|    1.171
---------------+--------+--------+---------
RxCan1[11a] Avg|   34.35|  1.6701|    0.020
           Peak|        |  1.6981|    1.273
---------------+--------+--------+---------
RxCan1[130] Avg|   50.00|  0.7902|    0.018
           Peak|        |  0.8513|    0.980
---------------+--------+--------+---------
RxCan1[139] Avg|   49.92|  0.7872|    0.013
           Peak|        |  0.8219|    0.795
---------------+--------+--------+---------
RxCan1[156] Avg|   10.00|  0.1620|    0.014
           Peak|        |  0.1729|    0.919
---------------+--------+--------+---------
RxCan1[160] Avg|   50.04|  0.7977|    0.014
           Peak|        |  0.8232|    1.495
---------------+--------+--------+---------
RxCan1[165] Avg|   49.85|  0.7976|    0.014
           Peak|        |  0.8486|    1.015
---------------+--------+--------+---------
RxCan1[167] Avg|   34.39|  1.6025|    0.016
           Peak|        |  1.6888|    1.354
---------------+--------+--------+---------
RxCan1[171] Avg|   50.00|  0.8150|    0.017
           Peak|        |  0.8488|    1.091
---------------+--------+--------+---------
RxCan1[178] Avg|   10.00|  0.1614|    0.014
           Peak|        |  0.1702|    0.903
---------------+--------+--------+---------
RxCan1[179] Avg|   10.00|  0.1630|    0.017
           Peak|        |  0.1663|    1.336
---------------+--------+--------+---------
RxCan1[180] Avg|   50.00|  0.8137|    0.014
           Peak|        |  0.8605|    1.566
---------------+--------+--------+---------
RxCan1[185] Avg|   50.04|  0.8033|    0.013
           Peak|        |  0.8393|    1.126
---------------+--------+--------+---------
RxCan1[1a0] Avg|   49.92|  0.7748|    0.013
           Peak|        |  0.8169|    1.184
---------------+--------+--------+---------
RxCan1[1e0] Avg|   49.92|  0.7738|    0.014
           Peak|        |  0.8028|    1.049
---------------+--------+--------+---------
RxCan1[1e4] Avg|   49.89|  0.9692|    0.018
           Peak|        |  1.0096|    1.332
---------------+--------+--------+---------
RxCan1[1f0] Avg|   33.22|  0.5544|    0.014
           Peak|        |  0.5855|    0.848
---------------+--------+--------+---------
RxCan1[200] Avg|   49.92|  0.7879|    0.015
           Peak|        |  0.8345|    1.206
---------------+--------+--------+---------
RxCan1[202] Avg|   34.28|  1.7075|    0.016
           Peak|        |  1.7874|    1.218
---------------+--------+--------+---------
RxCan1[204] Avg|   34.35|  1.5641|    0.013
           Peak|        |  1.6427|    1.235
---------------+--------+--------+---------
RxCan1[213] Avg|   49.89|  0.7814|    0.015
           Peak|        |  0.8232|    0.910
---------------+--------+--------+---------
RxCan1[214] Avg|   49.92|  0.7736|    0.014
           Peak|        |  0.8216|    0.800
---------------+--------+--------+---------
RxCan1[217] Avg|   34.31|  1.6294|    0.014
           Peak|        |  1.7165|    1.153
---------------+--------+--------+---------
RxCan1[218] Avg|   49.86|  0.7877|    0.013
           Peak|        |  0.8290|    1.068
---------------+--------+--------+---------
RxCan1[230] Avg|   50.00|  0.7596|    0.014
           Peak|        |  0.7660|    1.021
---------------+--------+--------+---------
RxCan1[240] Avg|   10.00|  0.1669|    0.013
           Peak|        |  0.1835|    0.887
---------------+--------+--------+---------
RxCan1[242] Avg|   24.96|  0.4764|    0.020
           Peak|        |  0.4963|    1.501
---------------+--------+--------+---------
RxCan1[24a] Avg|    9.89|  0.1789|    0.015
           Peak|        |  0.2009|    0.874
---------------+--------+--------+---------
RxCan1[24b] Avg|    9.89|  0.1702|    0.014
           Peak|        |  0.1870|    1.195
---------------+--------+--------+---------
RxCan1[24c] Avg|    9.89|  0.2146|    0.019
           Peak|        |  0.2187|    1.242
---------------+--------+--------+---------
RxCan1[25a] Avg|   10.00|  0.1603|    0.013
           Peak|        |  0.1667|    0.720
---------------+--------+--------+---------
RxCan1[25b] Avg|   49.94|  0.7918|    0.017
           Peak|        |  0.8454|    1.666
---------------+--------+--------+---------
RxCan1[25c] Avg|   34.24|  1.5331|    0.013
           Peak|        |  1.5997|    1.538
---------------+--------+--------+---------
RxCan1[260] Avg|   10.00|  0.1626|    0.014
           Peak|        |  0.1682|    0.718
---------------+--------+--------+---------
RxCan1[270] Avg|   49.90|  0.8120|    0.014
           Peak|        |  0.8460|    1.671
---------------+--------+--------+---------
RxCan1[280] Avg|   49.92|  0.7777|    0.019
           Peak|        |  0.8447|    1.157
---------------+--------+--------+---------
RxCan1[2e4] Avg|   19.89|  0.5778|    0.032
           Peak|        |  0.6648|    2.226
---------------+--------+--------+---------
RxCan1[2ec] Avg|   10.00|  0.1701|    0.014
           Peak|        |  0.1755|    0.928
---------------+--------+--------+---------
RxCan1[2ed] Avg|   10.00|  0.1650|    0.013
           Peak|        |  0.1747|    0.917
---------------+--------+--------+---------
RxCan1[2ee] Avg|    9.98|  0.1544|    0.013
           Peak|        |  0.1588|    1.312
---------------+--------+--------+---------
RxCan1[312] Avg|   10.00|  0.1648|    0.017
           Peak|        |  0.1690|    0.922
---------------+--------+--------+---------
RxCan1[326] Avg|    9.89|  0.1603|    0.015
           Peak|        |  0.1833|    1.230
---------------+--------+--------+---------
RxCan1[336] Avg|    1.00|  0.0146|    0.015
           Peak|        |  0.0150|    0.349
---------------+--------+--------+---------
RxCan1[352] Avg|    6.66|  0.1223|    0.022
           Peak|        |  0.1338|    1.015
---------------+--------+--------+---------
RxCan1[355] Avg|    2.00|  0.0424|    0.019
           Peak|        |  0.0431|    0.786
---------------+--------+--------+---------
RxCan1[35e] Avg|    9.96|  0.1570|    0.013
           Peak|        |  0.1644|    0.579
---------------+--------+--------+---------
RxCan1[365] Avg|   10.00|  0.1600|    0.014
           Peak|        |  0.1653|    0.961
---------------+--------+--------+---------
RxCan1[366] Avg|   10.00|  0.1716|    0.013
           Peak|        |  0.1890|    0.987
---------------+--------+--------+---------
RxCan1[367] Avg|    9.93|  0.1793|    0.015
           Peak|        |  0.1864|    0.984
---------------+--------+--------+---------
RxCan1[368] Avg|   10.00|  0.1645|    0.014
           Peak|        |  0.1778|    0.768
---------------+--------+--------+---------
RxCan1[369] Avg|   10.00|  0.1562|    0.016
           Peak|        |  0.1606|    0.724
---------------+--------+--------+---------
RxCan1[380] Avg|   10.00|  0.1619|    0.014
           Peak|        |  0.1644|    0.605
---------------+--------+--------+---------
RxCan1[38b] Avg|   25.00|  0.3991|    0.016
           Peak|        |  0.4280|    1.448
---------------+--------+--------+---------
RxCan1[3b3] Avg|   10.00|  0.1537|    0.013
           Peak|        |  0.1610|    0.380
---------------+--------+--------+---------
RxCan1[400] Avg|    4.00|  0.0626|    0.014
           Peak|        |  0.0626|    0.251
---------------+--------+--------+---------
RxCan1[405] Avg|    3.90|  0.1019|    0.028
           Peak|        |  0.1019|    0.781
---------------+--------+--------+---------
RxCan1[40a] Avg|    7.90|  0.1256|    0.020
           Peak|        |  0.1256|    0.991
---------------+--------+--------+---------
RxCan1[410] Avg|   10.00|  0.1643|    0.016
           Peak|        |  0.1839|    1.634
---------------+--------+--------+---------
RxCan1[411] Avg|   10.00|  0.1532|    0.013
           Peak|        |  0.1645|    0.824
---------------+--------+--------+---------
RxCan1[416] Avg|   10.00|  0.1516|    0.016
           Peak|        |  0.1582|    0.807
---------------+--------+--------+---------
RxCan1[421] Avg|   10.00|  0.1648|    0.013
           Peak|        |  0.1740|    0.839
---------------+--------+--------+---------
RxCan1[42d] Avg|   10.00|  0.1548|    0.014
           Peak|        |  0.1658|    0.741
---------------+--------+--------+---------
RxCan1[42f] Avg|   10.00|  0.1527|    0.013
           Peak|        |  0.1578|    0.667
---------------+--------+--------+---------
RxCan1[430] Avg|   10.00|  0.1730|    0.016
           Peak|        |  0.1880|    1.209
---------------+--------+--------+---------
RxCan1[434] Avg|   10.00|  0.1620|    0.021
           Peak|        |  0.1712|    1.140
---------------+--------+--------+---------
RxCan1[435] Avg|    6.66|  0.1104|    0.014
           Peak|        |  0.1121|    1.011
---------------+--------+--------+---------
RxCan1[43e] Avg|   20.00|  0.3194|    0.013
           Peak|        |  0.3434|    1.212
---------------+--------+--------+---------
RxCan1[440] Avg|    1.00|  0.0160|    0.014
           Peak|        |  0.0175|    0.315
---------------+--------+--------+---------
RxCan1[465] Avg|    1.00|  0.0172|    0.015
           Peak|        |  0.0194|    0.404
---------------+--------+--------+---------
RxCan1[466] Avg|    1.00|  0.0198|    0.015
           Peak|        |  0.0252|    0.890
---------------+--------+--------+---------
RxCan1[467] Avg|    1.00|  0.0152|    0.014
           Peak|        |  0.0160|    0.217
---------------+--------+--------+---------
RxCan1[472] Avg|    0.70|  0.0533|    0.075
           Peak|        |  0.0546|    0.990
---------------+--------+--------+---------
RxCan1[473] Avg|    0.65|  0.0325|    0.051
           Peak|        |  0.0361|    0.774
---------------+--------+--------+---------
RxCan1[474] Avg|    1.00|  0.0146|    0.014
           Peak|        |  0.0151|    0.189
---------------+--------+--------+---------
RxCan1[475] Avg|    2.00|  0.0332|    0.015
           Peak|        |  0.0362|    0.513
---------------+--------+--------+---------
RxCan1[476] Avg|    2.00|  0.0305|    0.014
           Peak|        |  0.0307|    0.249
---------------+--------+--------+---------
RxCan1[477] Avg|    2.00|  0.0309|    0.014
           Peak|        |  0.0311|    0.438
---------------+--------+--------+---------
RxCan1[595] Avg|    1.00|  0.0151|    0.014
           Peak|        |  0.0160|    0.230
---------------+--------+--------+---------
RxCan1[59e] Avg|    1.00|  0.0179|    0.015
           Peak|        |  0.0209|    0.716
---------------+--------+--------+---------
RxCan1[5a2] Avg|    1.00|  0.0154|    0.016
           Peak|        |  0.0184|    0.699
---------------+--------+--------+---------
RxCan1[5ba] Avg|    1.00|  0.0159|    0.017
           Peak|        |  0.0174|    0.485
---------------+--------+--------+---------
RxCan2[010] Avg|    0.00|  0.0000|    0.015
           Peak|        |  0.0000|    0.146
---------------+--------+--------+---------
RxCan2[020] Avg|   31.10|  0.5159|    0.015
           Peak|        |  0.5730|    0.992
---------------+--------+--------+---------
RxCan2[030] Avg|   20.70|  0.3506|    0.016
           Peak|        |  0.3956|    1.055
---------------+--------+--------+---------
RxCan2[03a] Avg|   18.65|  0.3157|    0.014
           Peak|        |  0.3292|    0.702
---------------+--------+--------+---------
RxCan2[040] Avg|   18.60|  0.3111|    0.015
           Peak|        |  0.3474|    0.953
---------------+--------+--------+---------
RxCan2[060] Avg|   18.60|  0.3182|    0.014
           Peak|        |  0.3569|    0.694
---------------+--------+--------+---------
RxCan2[070] Avg|   15.55|  0.4581|    0.017
           Peak|        |  0.6859|   39.212
---------------+--------+--------+---------
RxCan2[080] Avg|   15.50|  0.5041|    0.029
           Peak|        |  0.5414|    1.555
---------------+--------+--------+---------
RxCan2[083] Avg|   18.70|  0.3083|    0.014
           Peak|        |  0.3325|    0.557
---------------+--------+--------+---------
RxCan2[090] Avg|   23.40|  0.3961|    0.014
           Peak|        |  0.4445|    1.218
---------------+--------+--------+---------
RxCan2[0a0] Avg|   15.55|  0.2734|    0.014
           Peak|        |  0.3144|    1.062
---------------+--------+--------+---------
RxCan2[100] Avg|   15.50|  0.2645|    0.016
           Peak|        |  0.2875|    1.021
---------------+--------+--------+---------
RxCan2[108] Avg|   23.40|  0.4231|    0.016
           Peak|        |  0.4680|    1.297
---------------+--------+--------+---------
RxCan2[110] Avg|   15.55|  0.2467|    0.014
           Peak|        |  0.2684|    0.475
---------------+--------+--------+---------
RxCan2[130] Avg|   13.30|  0.2231|    0.014
           Peak|        |  0.2447|    0.512
---------------+--------+--------+---------
RxCan2[150] Avg|   15.50|  0.2533|    0.015
           Peak|        |  0.2836|    0.823
---------------+--------+--------+---------
RxCan2[160] Avg|    4.70|  0.0784|    0.014
           Peak|        |  0.0863|    0.608
---------------+--------+--------+---------
RxCan2[180] Avg|   15.55|  0.2713|    0.015
           Peak|        |  0.2841|    0.884
---------------+--------+--------+---------
RxCan2[190] Avg|   15.50|  0.2596|    0.014
           Peak|        |  0.2825|    0.743
---------------+--------+--------+---------
RxCan2[1a0] Avg|    0.95|  0.0164|    0.015
           Peak|        |  0.0164|    0.346
---------------+--------+--------+---------
RxCan2[1a4] Avg|   18.65|  0.3232|    0.015
           Peak|        |  0.3515|    0.989
---------------+--------+--------+---------
RxCan2[1a8] Avg|   11.60|  0.1911|    0.016
           Peak|        |  0.2012|    0.757
---------------+--------+--------+---------
RxCan2[1b0] Avg|    9.35|  0.1558|    0.016
           Peak|        |  0.1641|    0.795
---------------+--------+--------+---------
RxCan2[1b4] Avg|    9.35|  0.1543|    0.015
           Peak|        |  0.1617|    1.217
---------------+--------+--------+---------
RxCan2[1b8] Avg|   11.65|  0.2003|    0.014
           Peak|        |  0.2236|    1.549
---------------+--------+--------+---------
RxCan2[1c0] Avg|    9.40|  0.1532|    0.016
           Peak|        |  0.1673|    0.955
---------------+--------+--------+---------
RxCan2[1e0] Avg|    9.30|  0.1582|    0.015
           Peak|        |  0.1708|    0.661
---------------+--------+--------+---------
RxCan2[215] Avg|    7.80|  0.1409|    0.016
           Peak|        |  0.1531|    0.660
---------------+--------+--------+---------
RxCan2[217] Avg|    7.80|  0.1239|    0.014
           Peak|        |  0.1333|    0.520
---------------+--------+--------+---------
RxCan2[220] Avg|    6.20|  0.1041|    0.015
           Peak|        |  0.1094|    0.652
---------------+--------+--------+---------
RxCan2[225] Avg|   23.40|  0.4648|    0.015
           Peak|        |  0.4696|    4.288
---------------+--------+--------+---------
RxCan2[230] Avg|    6.20|  0.3120|    0.048
           Peak|        |  0.3377|    1.065
---------------+--------+--------+---------
RxCan2[240] Avg|    7.70|  0.1248|    0.014
           Peak|        |  0.1364|    0.635
---------------+--------+--------+---------
RxCan2[241] Avg|   18.60|  0.3258|    0.014
           Peak|        |  0.3343|    1.288
---------------+--------+--------+---------
RxCan2[250] Avg|    4.70|  0.0761|    0.014
           Peak|        |  0.0809|    0.322
---------------+--------+--------+---------
RxCan2[255] Avg|   11.75|  0.2058|    0.014
           Peak|        |  0.2283|    0.937
---------------+--------+--------+---------
RxCan2[265] Avg|   11.65|  0.1964|    0.014
           Peak|        |  0.2068|    0.965
---------------+--------+--------+---------
RxCan2[270] Avg|    4.70|  0.0808|    0.016
           Peak|        |  0.0949|    0.729
---------------+--------+--------+---------
RxCan2[290] Avg|    3.15|  0.0498|    0.015
           Peak|        |  0.0504|    0.449
---------------+--------+--------+---------
RxCan2[295] Avg|    6.25|  0.1019|    0.014
           Peak|        |  0.1094|    0.859
---------------+--------+--------+---------
RxCan2[2a0] Avg|    3.15|  0.0550|    0.014
           Peak|        |  0.0551|    0.779
---------------+--------+--------+---------
RxCan2[2a7] Avg|   11.65|  0.1929|    0.014
           Peak|        |  0.2080|    0.775
---------------+--------+--------+---------
RxCan2[2b0] Avg|    3.00|  0.0497|    0.015
           Peak|        |  0.0562|    0.528
---------------+--------+--------+---------
RxCan2[2c0] Avg|    3.10|  0.0534|    0.016
           Peak|        |  0.0592|    0.501
---------------+--------+--------+---------
RxCan2[2e0] Avg|    1.55|  0.0247|    0.014
           Peak|        |  0.0289|    0.319
---------------+--------+--------+---------
RxCan2[2f0] Avg|    1.55|  0.0244|    0.014
           Peak|        |  0.0273|    0.192
---------------+--------+--------+---------
RxCan2[2f5] Avg|   11.65|  0.2078|    0.016
           Peak|        |  0.2333|    0.879
---------------+--------+--------+---------
RxCan2[300] Avg|    1.60|  0.0266|    0.018
           Peak|        |  0.0278|    0.724
---------------+--------+--------+---------
RxCan2[310] Avg|    1.55|  0.0276|    0.016
           Peak|        |  0.0285|    0.759
---------------+--------+--------+---------
RxCan2[320] Avg|    1.60|  0.0240|    0.014
           Peak|        |  0.0258|    0.179
---------------+--------+--------+---------
RxCan2[326] Avg|    9.30|  0.1550|    0.014
           Peak|        |  0.1582|    0.850
---------------+--------+--------+---------
RxCan2[330] Avg|   29.95|  0.5311|    0.015
           Peak|        |  0.5565|    4.522
---------------+--------+--------+---------
RxCan2[340] Avg|    7.75|  0.1693|    0.024
           Peak|        |  0.1868|    1.148
---------------+--------+--------+---------
RxCan2[345] Avg|    1.60|  0.0292|    0.016
           Peak|        |  0.0316|    0.471
---------------+--------+--------+---------
RxCan2[350] Avg|    0.00|  0.0000|    0.019
           Peak|        |  0.0000|    0.188
---------------+--------+--------+---------
RxCan2[35e] Avg|    4.70|  0.0851|    0.019
           Peak|        |  0.0911|    1.023
---------------+--------+--------+---------
RxCan2[360] Avg|    1.60|  0.0258|    0.015
           Peak|        |  0.0284|    0.306
---------------+--------+--------+---------
RxCan2[361] Avg|    7.75|  0.1341|    0.017
           Peak|        |  0.1487|    0.761
---------------+--------+--------+---------
RxCan2[363] Avg|    1.20|  0.0203|    0.016
           Peak|        |  0.0220|    0.421
---------------+--------+--------+---------
RxCan2[370] Avg|    0.85|  0.0140|    0.016
           Peak|        |  0.0162|    0.354
---------------+--------+--------+---------
RxCan2[381] Avg|    3.15|  0.0512|    0.016
           Peak|        |  0.0546|    0.416
---------------+--------+--------+---------
RxCan2[3a0] Avg|   15.60|  0.2548|    0.015
           Peak|        |  0.2890|    0.976
---------------+--------+--------+---------
RxCan2[3d0] Avg|    9.35|  0.1553|    0.019
           Peak|        |  0.1612|    1.115
---------------+--------+--------+---------
RxCan2[3d5] Avg|    5.15|  0.0836|    0.016
           Peak|        |  0.0867|    0.479
---------------+--------+--------+---------
RxCan2[3e0] Avg|    0.00|  0.0000|    0.014
           Peak|        |  0.0000|    0.142
---------------+--------+--------+---------
RxCan2[400] Avg|    3.55|  0.0613|    0.017
           Peak|        |  0.0695|    0.501
---------------+--------+--------+---------
RxCan2[405] Avg|    3.50|  0.0584|    0.018
           Peak|        |  0.0626|    0.686
---------------+--------+--------+---------
RxCan2[40a] Avg|    7.10|  0.1278|    0.017
           Peak|        |  0.1389|    1.244
---------------+--------+--------+---------
RxCan2[415] Avg|    1.60|  0.0258|    0.014
           Peak|        |  0.0287|    0.266
---------------+--------+--------+---------
RxCan2[435] Avg|    0.85|  0.0165|    0.019
           Peak|        |  0.0167|    0.367
---------------+--------+--------+---------
RxCan2[440] Avg|    0.85|  0.0128|    0.019
           Peak|        |  0.0141|    0.885
---------------+--------+--------+---------
RxCan2[465] Avg|    0.95|  0.0177|    0.016
           Peak|        |  0.0195|    0.721
---------------+--------+--------+---------
RxCan2[466] Avg|    0.95|  0.0147|    0.014
           Peak|        |  0.0160|    0.184
---------------+--------+--------+---------
RxCan2[467] Avg|    0.95|  0.0172|    0.017
           Peak|        |  0.0188|    0.391
---------------+--------+--------+---------
RxCan2[501] Avg|    1.45|  0.0273|    0.016
           Peak|        |  0.0327|    0.996
---------------+--------+--------+---------
RxCan2[503] Avg|    1.45|  0.0288|    0.020
           Peak|        |  0.0338|    0.970
---------------+--------+--------+---------
RxCan2[504] Avg|    1.40|  0.0241|    0.015
           Peak|        |  0.0263|    0.609
---------------+--------+--------+---------
RxCan2[505] Avg|    1.40|  0.0255|    0.015
           Peak|        |  0.0296|    0.866
---------------+--------+--------+---------
RxCan2[508] Avg|    1.35|  0.0237|    0.017
           Peak|        |  0.0237|    0.384
---------------+--------+--------+---------
RxCan2[511] Avg|    1.35|  0.0226|    0.016
           Peak|        |  0.0228|    0.426
---------------+--------+--------+---------
RxCan2[51e] Avg|    1.40|  0.0221|    0.014
           Peak|        |  0.0245|    0.211
---------------+--------+--------+---------
RxCan2[581] Avg|    0.80|  0.0189|    0.019
           Peak|        |  0.0290|    1.217
---------------+--------+--------+---------
RxCan2[606] Avg|    0.00|  0.0000|    0.014
           Peak|        |  0.0000|    0.142
---------------+--------+--------+---------
RxCan2[657] Avg|    0.00|  0.0000|    0.014
           Peak|        |  0.0000|    0.137
---------------+--------+--------+---------
Cmd:State   Avg|    0.00|  0.0000|    0.002
           Peak|        |  0.0000|    0.024
===============+========+========+=========
      Total Avg| 2748.42| 58.3344|   28.718

@Simon: it would be an option to try commenting out the overflow counting, to see if that's causing the issue.

I have commented out the line with the Atomic_Increment statement. Now I no longer receive any messages with “RX Task Queue Overflow Run”
Here is the output of poller times status:

OVMS# poll time status
Poller timing is: on
Type           | count  | Utlztn | Time
               | per s  | [%]    | [ms]
---------------+--------+--------+---------
Poll:PRI    Avg|    1.00|  0.0045|    0.004
           Peak|        |  0.0046|    0.064
---------------+--------+--------+---------
RxCan1[010] Avg|   34.26|  2.2574|    0.021
           Peak|        |  2.2574|    4.609
---------------+--------+--------+---------
RxCan1[030] Avg|   34.26|  2.3820|    0.021
           Peak|        |  2.3820|    1.135
---------------+--------+--------+---------
RxCan1[041] Avg|   49.89|  1.2059|    0.021
           Peak|        |  1.2295|    5.331
---------------+--------+--------+---------
RxCan1[049] Avg|   49.96|  1.2400|    0.030
           Peak|        |  1.2699|    1.402
---------------+--------+--------+---------
RxCan1[04c] Avg|   49.92|  1.1752|    0.021
           Peak|        |  1.2072|    4.502
---------------+--------+--------+---------
RxCan1[04d] Avg|   34.31|  2.4433|    0.022
           Peak|        |  2.4773|    1.368
---------------+--------+--------+---------
RxCan1[076] Avg|   49.96|  1.2071|    0.024
           Peak|        |  1.2554|    2.007
---------------+--------+--------+---------
RxCan1[077] Avg|   49.96|  1.2012|    0.022
           Peak|        |  1.2492|    1.955
---------------+--------+--------+---------
RxCan1[07a] Avg|   34.35|  2.9251|    0.030
           Peak|        |  3.1103|    1.829
---------------+--------+--------+---------
RxCan1[07d] Avg|   49.96|  1.1954|    0.022
           Peak|        |  1.2282|    1.074
---------------+--------+--------+---------
RxCan1[0c8] Avg|   49.89|  1.2491|    0.021
           Peak|        |  1.3169|    1.181
---------------+--------+--------+---------
RxCan1[11a] Avg|   34.39|  2.4423|    0.024
           Peak|        |  2.5693|    1.491
---------------+--------+--------+---------
RxCan1[130] Avg|   49.95|  1.1312|    0.020
           Peak|        |  1.1684|    1.218
---------------+--------+--------+---------
RxCan1[139] Avg|   49.92|  1.1547|    0.021
           Peak|        |  1.1778|    1.199
---------------+--------+--------+---------
RxCan1[156] Avg|    9.96|  0.2391|    0.023
           Peak|        |  0.2591|    1.943
---------------+--------+--------+---------
RxCan1[160] Avg|   49.96|  1.1657|    0.031
           Peak|        |  1.2017|    2.158
---------------+--------+--------+---------
RxCan1[165] Avg|   49.96|  1.1257|    0.021
           Peak|        |  1.1652|    1.471
---------------+--------+--------+---------
RxCan1[167] Avg|   34.31|  2.2871|    0.021
           Peak|        |  2.3374|    1.776
---------------+--------+--------+---------
RxCan1[171] Avg|   49.96|  1.1879|    0.023
           Peak|        |  1.2268|    1.166
---------------+--------+--------+---------
RxCan1[178] Avg|   10.00|  0.2371|    0.029
           Peak|        |  0.2459|    1.516
---------------+--------+--------+---------
RxCan1[179] Avg|   10.00|  0.2196|    0.021
           Peak|        |  0.2260|    0.758
---------------+--------+--------+---------
RxCan1[180] Avg|   49.96|  1.1703|    0.022
           Peak|        |  1.2103|    1.481
---------------+--------+--------+---------
RxCan1[185] Avg|   49.95|  1.1127|    0.020
           Peak|        |  1.1636|    1.292
---------------+--------+--------+---------
RxCan1[1a0] Avg|   49.96|  1.1009|    0.020
           Peak|        |  1.1468|    1.060
---------------+--------+--------+---------
RxCan1[1e0] Avg|   49.96|  1.1744|    0.021
           Peak|        |  1.2027|    1.240
---------------+--------+--------+---------
RxCan1[1e4] Avg|   49.96|  1.3733|    0.032
           Peak|        |  1.4085|    1.523
---------------+--------+--------+---------
RxCan1[1f0] Avg|   33.30|  0.7625|    0.023
           Peak|        |  0.8004|    3.349
---------------+--------+--------+---------
RxCan1[200] Avg|   49.92|  1.1462|    0.021
           Peak|        |  1.1809|    1.254
---------------+--------+--------+---------
RxCan1[202] Avg|   34.39|  2.4034|    0.028
           Peak|        |  2.5611|    1.472
---------------+--------+--------+---------
RxCan1[204] Avg|   34.30|  2.2541|    0.022
           Peak|        |  2.2924|    2.015
---------------+--------+--------+---------
RxCan1[213] Avg|   49.96|  1.1599|    0.027
           Peak|        |  1.1794|    1.714
---------------+--------+--------+---------
RxCan1[214] Avg|   49.96|  1.1537|    0.022
           Peak|        |  1.1941|    1.439
---------------+--------+--------+---------
RxCan1[217] Avg|   34.39|  2.2490|    0.020
           Peak|        |  2.2856|    3.766
---------------+--------+--------+---------
RxCan1[218] Avg|   49.96|  1.1291|    0.021
           Peak|        |  1.1646|    1.547
---------------+--------+--------+---------
RxCan1[230] Avg|   49.96|  1.1272|    0.020
           Peak|        |  1.2237|    1.295
---------------+--------+--------+---------
RxCan1[240] Avg|   10.00|  0.2191|    0.021
           Peak|        |  0.2226|    1.067
---------------+--------+--------+---------
RxCan1[242] Avg|   24.96|  0.6911|    0.024
           Peak|        |  0.7161|    1.180
---------------+--------+--------+---------
RxCan1[24a] Avg|    9.96|  0.2345|    0.024
           Peak|        |  0.2535|    0.779
---------------+--------+--------+---------
RxCan1[24b] Avg|    9.96|  0.2433|    0.023
           Peak|        |  0.2697|    2.085
---------------+--------+--------+---------
RxCan1[24c] Avg|    9.96|  0.3103|    0.029
           Peak|        |  0.3203|    0.809
---------------+--------+--------+---------
RxCan1[25a] Avg|   10.00|  0.2346|    0.022
           Peak|        |  0.2405|    1.223
---------------+--------+--------+---------
RxCan1[25b] Avg|   49.89|  1.2121|    0.020
           Peak|        |  1.3659|   19.523
---------------+--------+--------+---------
RxCan1[25c] Avg|   34.31|  2.4193|    0.019
           Peak|        |  2.8022|   58.153
---------------+--------+--------+---------
RxCan1[260] Avg|    9.93|  0.2149|    0.024
           Peak|        |  0.2174|    1.096
---------------+--------+--------+---------
RxCan1[270] Avg|   49.96|  1.2042|    0.026
           Peak|        |  1.2755|   20.612
---------------+--------+--------+---------
RxCan1[280] Avg|   49.96|  1.0922|    0.020
           Peak|        |  1.1312|    1.266
---------------+--------+--------+---------
RxCan1[2e4] Avg|   19.96|  0.6942|    0.044
           Peak|        |  0.8604|    1.533
---------------+--------+--------+---------
RxCan1[2ec] Avg|   10.00|  0.3727|    0.025
           Peak|        |  0.5154|   28.819
---------------+--------+--------+---------
RxCan1[2ed] Avg|   10.00|  0.2298|    0.023
           Peak|        |  0.2378|    1.345
---------------+--------+--------+---------
RxCan1[2ee] Avg|    9.96|  0.2172|    0.019
           Peak|        |  0.2210|    1.058
---------------+--------+--------+---------
RxCan1[312] Avg|   10.00|  0.2206|    0.020
           Peak|        |  0.2396|    1.060
---------------+--------+--------+---------
RxCan1[326] Avg|    9.96|  0.2099|    0.020
           Peak|        |  0.2158|    0.507
---------------+--------+--------+---------
RxCan1[336] Avg|    1.00|  0.0212|    0.020
           Peak|        |  0.0233|    0.315
---------------+--------+--------+---------
RxCan1[352] Avg|    6.64|  0.1675|    0.024
           Peak|        |  0.1818|    1.048
---------------+--------+--------+---------
RxCan1[355] Avg|    2.00|  0.0540|    0.027
           Peak|        |  0.0619|    1.209
---------------+--------+--------+---------
RxCan1[35e] Avg|    9.98|  0.2221|    0.021
           Peak|        |  0.2284|    1.186
---------------+--------+--------+---------
RxCan1[365] Avg|   10.00|  0.2282|    0.023
           Peak|        |  0.2335|    0.769
---------------+--------+--------+---------
RxCan1[366] Avg|   10.00|  0.3163|    0.022
           Peak|        |  0.6330|   23.587
---------------+--------+--------+---------
RxCan1[367] Avg|   10.00|  0.2417|    0.021
           Peak|        |  0.2568|    1.417
---------------+--------+--------+---------
RxCan1[368] Avg|    9.96|  0.2187|    0.019
           Peak|        |  0.2250|    1.135
---------------+--------+--------+---------
RxCan1[369] Avg|    9.99|  0.2277|    0.021
           Peak|        |  0.2334|    0.667
---------------+--------+--------+---------
RxCan1[380] Avg|    9.96|  0.2133|    0.020
           Peak|        |  0.2161|    0.560
---------------+--------+--------+---------
RxCan1[38b] Avg|   24.92|  0.5622|    0.022
           Peak|        |  0.5716|    1.618
---------------+--------+--------+---------
RxCan1[3b3] Avg|   10.00|  0.2132|    0.023
           Peak|        |  0.2194|    1.106
---------------+--------+--------+---------
RxCan1[400] Avg|    4.00|  0.0885|    0.019
           Peak|        |  0.0885|    0.570
---------------+--------+--------+---------
RxCan1[405] Avg|    3.70|  0.1414|    0.036
           Peak|        |  0.1414|    0.710
---------------+--------+--------+---------
RxCan1[40a] Avg|    8.00|  0.1887|    0.021
           Peak|        |  0.1887|    1.027
---------------+--------+--------+---------
RxCan1[410] Avg|   10.00|  0.2141|    0.023
           Peak|        |  0.2188|    0.984
---------------+--------+--------+---------
RxCan1[411] Avg|   10.00|  0.2325|    0.023
           Peak|        |  0.2447|    0.660
---------------+--------+--------+---------
RxCan1[416] Avg|   10.00|  0.2326|    0.022
           Peak|        |  0.2389|    0.774
---------------+--------+--------+---------
RxCan1[421] Avg|   10.00|  0.2245|    0.021
           Peak|        |  0.2271|    1.160
---------------+--------+--------+---------
RxCan1[42d] Avg|   10.00|  0.2315|    0.021
           Peak|        |  0.2411|    0.677
---------------+--------+--------+---------
RxCan1[42f] Avg|   10.00|  0.2480|    0.020
           Peak|        |  0.2975|    8.093
---------------+--------+--------+---------
RxCan1[430] Avg|   10.00|  0.2203|    0.019
           Peak|        |  0.2302|    0.847
---------------+--------+--------+---------
RxCan1[434] Avg|   10.00|  0.2331|    0.019
           Peak|        |  0.2620|    1.150
---------------+--------+--------+---------
RxCan1[435] Avg|    6.68|  0.1445|    0.020
           Peak|        |  0.1486|    1.063
---------------+--------+--------+---------
RxCan1[43e] Avg|   20.00|  0.4515|    0.021
           Peak|        |  0.4632|    1.013
---------------+--------+--------+---------
RxCan1[440] Avg|    1.00|  0.0210|    0.019
           Peak|        |  0.0218|    0.294
---------------+--------+--------+---------
RxCan1[465] Avg|    0.95|  0.0214|    0.023
           Peak|        |  0.0215|    0.587
---------------+--------+--------+---------
RxCan1[466] Avg|    0.95|  0.0211|    0.021
           Peak|        |  0.0215|    0.350
---------------+--------+--------+---------
RxCan1[467] Avg|    0.95|  0.0191|    0.020
           Peak|        |  0.0201|    0.444
---------------+--------+--------+---------
RxCan1[472] Avg|    0.68|  0.0588|    0.085
           Peak|        |  0.0606|    1.170
---------------+--------+--------+---------
RxCan1[473] Avg|    0.66|  0.0407|    0.062
           Peak|        |  0.0492|    1.329
---------------+--------+--------+---------
RxCan1[474] Avg|    1.00|  0.0218|    0.021
           Peak|        |  0.0237|    0.278
---------------+--------+--------+---------
RxCan1[475] Avg|    1.96|  0.0466|    0.024
           Peak|        |  0.0570|    1.112
---------------+--------+--------+---------
RxCan1[476] Avg|    2.00|  0.0454|    0.020
           Peak|        |  0.0497|    0.409
---------------+--------+--------+---------
RxCan1[477] Avg|    2.00|  0.0497|    0.022
           Peak|        |  0.0595|    0.864
---------------+--------+--------+---------
RxCan1[595] Avg|    1.00|  0.0223|    0.021
           Peak|        |  0.0241|    0.296
---------------+--------+--------+---------
RxCan1[59e] Avg|    1.00|  0.0233|    0.024
           Peak|        |  0.0289|    0.713
---------------+--------+--------+---------
RxCan1[5a2] Avg|    1.00|  0.0200|    0.020
           Peak|        |  0.0204|    0.264
---------------+--------+--------+---------
RxCan1[5ba] Avg|    1.00|  0.0206|    0.021
           Peak|        |  0.0238|    0.515
---------------+--------+--------+---------
RxCan2[020] Avg|   33.30|  0.7938|    0.022
           Peak|        |  0.7938|    4.793
---------------+--------+--------+---------
RxCan2[030] Avg|   22.20|  0.5229|    0.022
           Peak|        |  0.5229|    0.985
---------------+--------+--------+---------
RxCan2[03a] Avg|   19.90|  0.4700|    0.022
           Peak|        |  0.4700|    0.804
---------------+--------+--------+---------
RxCan2[040] Avg|   19.90|  0.4678|    0.023
           Peak|        |  0.4678|    1.222
---------------+--------+--------+---------
RxCan2[060] Avg|   20.00|  0.6480|    0.050
           Peak|        |  0.6480|   20.997
---------------+--------+--------+---------
RxCan2[070] Avg|   16.60|  0.3944|    0.022
           Peak|        |  0.3944|    1.053
---------------+--------+--------+---------
RxCan2[080] Avg|   16.70|  0.7032|    0.041
           Peak|        |  0.7032|    1.611
---------------+--------+--------+---------
RxCan2[083] Avg|   20.10|  0.4329|    0.021
           Peak|        |  0.4329|    0.520
---------------+--------+--------+---------
RxCan2[090] Avg|   24.90|  0.5674|    0.017
           Peak|        |  0.5674|    1.149
---------------+--------+--------+---------
RxCan2[0a0] Avg|   16.60|  0.3836|    0.023
           Peak|        |  0.3836|    0.933
---------------+--------+--------+---------
RxCan2[100] Avg|   16.50|  0.3661|    0.021
           Peak|        |  0.3661|    0.740
---------------+--------+--------+---------
RxCan2[108] Avg|   24.90|  0.5923|    0.025
           Peak|        |  0.5923|    0.859
---------------+--------+--------+---------
RxCan2[110] Avg|   16.70|  0.3906|    0.023
           Peak|        |  0.3906|    0.697
---------------+--------+--------+---------
RxCan2[130] Avg|   14.40|  0.3341|    0.022
           Peak|        |  0.3341|    0.829
---------------+--------+--------+---------
RxCan2[150] Avg|   16.50|  0.4025|    0.020
           Peak|        |  0.4025|    1.120
---------------+--------+--------+---------
RxCan2[160] Avg|    4.90|  0.1252|    0.025
           Peak|        |  0.1252|    0.502
---------------+--------+--------+---------
RxCan2[180] Avg|   16.60|  0.3899|    0.023
           Peak|        |  0.3899|    0.799
---------------+--------+--------+---------
RxCan2[190] Avg|   16.60|  0.3892|    0.025
           Peak|        |  0.3892|    1.172
---------------+--------+--------+---------
RxCan2[1a0] Avg|    1.00|  0.0281|    0.025
           Peak|        |  0.0281|    0.695
---------------+--------+--------+---------
RxCan2[1a4] Avg|   20.00|  0.4525|    0.022
           Peak|        |  0.4525|    1.231
---------------+--------+--------+---------
RxCan2[1a8] Avg|   12.50|  0.2886|    0.020
           Peak|        |  0.2886|    1.048
---------------+--------+--------+---------
RxCan2[1b0] Avg|   10.00|  0.2300|    0.023
           Peak|        |  0.2300|    0.579
---------------+--------+--------+---------
RxCan2[1b4] Avg|   10.00|  0.2334|    0.022
           Peak|        |  0.2334|    0.947
---------------+--------+--------+---------
RxCan2[1b8] Avg|   12.40|  0.2970|    0.023
           Peak|        |  0.2970|    0.909
---------------+--------+--------+---------
RxCan2[1c0] Avg|   10.00|  0.2257|    0.021
           Peak|        |  0.2257|    0.983
---------------+--------+--------+---------
RxCan2[1e0] Avg|   10.00|  0.2141|    0.023
           Peak|        |  0.2141|    0.556
---------------+--------+--------+---------
RxCan2[215] Avg|    8.30|  0.2047|    0.025
           Peak|        |  0.2047|    0.786
---------------+--------+--------+---------
RxCan2[217] Avg|    8.30|  0.2033|    0.022
           Peak|        |  0.2033|    1.135
---------------+--------+--------+---------
RxCan2[220] Avg|    6.70|  0.1647|    0.020
           Peak|        |  0.1647|    0.961
---------------+--------+--------+---------
RxCan2[225] Avg|   24.90|  0.6136|    0.026
           Peak|        |  0.6136|    1.018
---------------+--------+--------+---------
RxCan2[230] Avg|    6.70|  0.4045|    0.057
           Peak|        |  0.4045|    1.532
---------------+--------+--------+---------
RxCan2[240] Avg|    8.20|  0.1849|    0.021
           Peak|        |  0.1849|    0.510
---------------+--------+--------+---------
RxCan2[241] Avg|   20.00|  0.4312|    0.021
           Peak|        |  0.4312|    5.110
---------------+--------+--------+---------
RxCan2[250] Avg|    5.00|  0.1072|    0.021
           Peak|        |  0.1072|    0.320
---------------+--------+--------+---------
RxCan2[255] Avg|   12.50|  0.3091|    0.022
           Peak|        |  0.3091|    0.904
---------------+--------+--------+---------
RxCan2[265] Avg|   12.50|  0.2819|    0.021
           Peak|        |  0.2819|    1.035
---------------+--------+--------+---------
RxCan2[270] Avg|    5.00|  0.1189|    0.022
           Peak|        |  0.1189|    0.631
---------------+--------+--------+---------
RxCan2[290] Avg|    3.30|  0.0740|    0.023
           Peak|        |  0.0740|    0.455
---------------+--------+--------+---------
RxCan2[295] Avg|    6.60|  0.1431|    0.023
           Peak|        |  0.1431|    0.504
---------------+--------+--------+---------
RxCan2[2a0] Avg|    3.30|  0.0686|    0.020
           Peak|        |  0.0686|    0.445
---------------+--------+--------+---------
RxCan2[2a7] Avg|   12.50|  0.2869|    0.021
           Peak|        |  0.2869|    0.660
---------------+--------+--------+---------
RxCan2[2b0] Avg|    3.20|  0.0707|    0.023
           Peak|        |  0.0707|    0.331
---------------+--------+--------+---------
RxCan2[2c0] Avg|    3.20|  0.0988|    0.026
           Peak|        |  0.0988|    0.932
---------------+--------+--------+---------
RxCan2[2e0] Avg|    1.60|  0.0388|    0.024
           Peak|        |  0.0388|    0.393
---------------+--------+--------+---------
RxCan2[2f0] Avg|    1.70|  0.0376|    0.021
           Peak|        |  0.0376|    0.282
---------------+--------+--------+---------
RxCan2[2f5] Avg|   12.50|  0.2833|    0.021
           Peak|        |  0.2833|    0.855
---------------+--------+--------+---------
RxCan2[300] Avg|    1.70|  0.0398|    0.023
           Peak|        |  0.0398|    0.488
---------------+--------+--------+---------
RxCan2[310] Avg|    1.60|  0.0480|    0.026
           Peak|        |  0.0480|    0.937
---------------+--------+--------+---------
RxCan2[320] Avg|    1.70|  0.0346|    0.020
           Peak|        |  0.0346|    0.370
---------------+--------+--------+---------
RxCan2[326] Avg|    9.90|  0.2200|    0.022
           Peak|        |  0.2200|    0.502
---------------+--------+--------+---------
RxCan2[330] Avg|   32.30|  0.7323|    0.021
           Peak|        |  0.7323|    1.130
---------------+--------+--------+---------
RxCan2[340] Avg|    8.20|  0.2375|    0.028
           Peak|        |  0.2375|    0.578
---------------+--------+--------+---------
RxCan2[345] Avg|    1.60|  0.0393|    0.022
           Peak|        |  0.0393|    0.590
---------------+--------+--------+---------
RxCan2[35e] Avg|    5.00|  0.1303|    0.023
           Peak|        |  0.1303|    0.943
---------------+--------+--------+---------
RxCan2[360] Avg|    1.70|  0.0381|    0.025
           Peak|        |  0.0381|    0.922
---------------+--------+--------+---------
RxCan2[361] Avg|    8.20|  0.1907|    0.023
           Peak|        |  0.1907|    1.119
---------------+--------+--------+---------
RxCan2[363] Avg|    1.30|  0.0337|    0.024
           Peak|        |  0.0337|    0.425
---------------+--------+--------+---------
RxCan2[370] Avg|    0.90|  0.0194|    0.022
           Peak|        |  0.0194|    0.246
---------------+--------+--------+---------
RxCan2[381] Avg|    3.20|  0.0684|    0.024
           Peak|        |  0.0684|    0.828
---------------+--------+--------+---------
RxCan2[3a0] Avg|   16.60|  0.3734|    0.022
           Peak|        |  0.3734|    0.636
---------------+--------+--------+---------
RxCan2[3d0] Avg|   10.00|  0.2262|    0.023
           Peak|        |  0.2262|    0.663
---------------+--------+--------+---------
RxCan2[3d5] Avg|    5.60|  0.1335|    0.022
           Peak|        |  0.1335|    1.222
---------------+--------+--------+---------
RxCan2[400] Avg|    4.00|  0.0949|    0.022
           Peak|        |  0.0949|    0.715
---------------+--------+--------+---------
RxCan2[405] Avg|    3.70|  0.0861|    0.022
           Peak|        |  0.0861|    0.443
---------------+--------+--------+---------
RxCan2[40a] Avg|    8.00|  0.1853|    0.021
           Peak|        |  0.1853|    0.552
---------------+--------+--------+---------
RxCan2[415] Avg|    1.60|  0.0341|    0.021
           Peak|        |  0.0341|    0.273
---------------+--------+--------+---------
RxCan2[435] Avg|    0.90|  0.0220|    0.025
           Peak|        |  0.0220|    0.354
---------------+--------+--------+---------
RxCan2[440] Avg|    0.90|  0.0199|    0.021
           Peak|        |  0.0199|    0.266
---------------+--------+--------+---------
RxCan2[465] Avg|    0.90|  0.0234|    0.028
           Peak|        |  0.0234|    0.633
---------------+--------+--------+---------
RxCan2[466] Avg|    1.00|  0.0222|    0.021
           Peak|        |  0.0222|    0.322
---------------+--------+--------+---------
RxCan2[467] Avg|    1.00|  0.0221|    0.020
           Peak|        |  0.0221|    0.355
---------------+--------+--------+---------
RxCan2[501] Avg|    1.50|  0.0335|    0.023
           Peak|        |  0.0335|    0.393
---------------+--------+--------+---------
RxCan2[503] Avg|    1.50|  0.0370|    0.022
           Peak|        |  0.0370|    0.546
---------------+--------+--------+---------
RxCan2[504] Avg|    1.40|  0.0328|    0.022
           Peak|        |  0.0328|    0.489
---------------+--------+--------+---------
RxCan2[505] Avg|    1.40|  0.0290|    0.021
           Peak|        |  0.0290|    0.354
---------------+--------+--------+---------
RxCan2[508] Avg|    1.40|  0.0318|    0.023
           Peak|        |  0.0318|    0.408
---------------+--------+--------+---------
RxCan2[511] Avg|    1.40|  0.0306|    0.022
           Peak|        |  0.0306|    0.328
---------------+--------+--------+---------
RxCan2[51e] Avg|    1.40|  0.0310|    0.022
           Peak|        |  0.0310|    0.269
---------------+--------+--------+---------
RxCan2[581] Avg|    1.00|  0.0222|    0.022
           Peak|        |  0.0222|    0.256
---------------+--------+--------+---------
Cmd:State   Avg|    0.00|  0.0000|    0.002
           Peak|        |  0.0000|    0.024
===============+========+========+=========
      Total Avg| 2795.57| 82.7745|   40.174

Cheers,
Simon

Am 17.01.2025 um 17:49 schrieb Michael Balzer via OvmsDev:
OK, I've got a new idea: CAN timing.

Comparing our esp32can bit timing to the esp-idf driver's, there seem to be some differences:
https://github.com/espressif/esp-idf/blob/master/components/hal/include/hal/twai_types_deprecated.h#L75

Transceivers are normally tolerant to small timing offsets. Maybe being off a little bit has no effect under normal conditions, but it has when the transceiver has to cope with a filled RX queue. That could be causing the transceiver to slide just out of sync. If the timing gets garbled, the transceiver would signal errors in the packets to the bus, possibly so many the vehicle ECUs decide to raise an error condition.

Is that plausible?

On why the new poller could be causing this (in combination with too slow processing by the vehicle): as mentioned, the standard CAN listener mechanism doesn't care about queue overflows. The poller does. `OvmsPollers::Queue_PollerFrame()` does a log call when Tx/Rx tracing is enabled, that could even block, but tracing is optional and only meant for debugging. Not optional is the overflow counting using an atomic uint32.

The atomic types are said to be fast, but I never checked their actual implementation on the ESP32. Maybe they can block as well?

@Simon: it would be an option to try commenting out the overflow counting, to see if that's causing the issue.

Regards,
Michael


Am 17.01.25 um 15:37 schrieb Chris Box via OvmsDev:

Yes, I can confirm I've had one experience of the Leaf switching to Neutral while driving, with a yellow warning symbol on the dash. It refused to reselect Drive until I had switched the car off and back on. Derek wasn't so lucky and he need to clear fault codes before the car would work.

On returning home, I found OVMS was not accessible over a network. I didn't try a USB cable. Unplugging and reinserting the OBD cable caused OVMS to rejoin Wi-Fi. However the SD logs showed nothing from the time of the event. CAN writes are enabled, so it can perform SOC limiting.

My car has been using this firmware since 21st November, based on the git master of that day. As a relatively new user of OVMS (only since October) I don't have much experience of older firmware.

Perhaps a safeguard should be implemented before releasing a new stable firmware that will be automatically downloaded by Leaf owners. But I don't have the expertise to know what that safeguard should be. Derek's suggestion of 'only CAN write when parked' appears to be a good idea.

Chris


On 2025-01-15 18:18, Derek Caudwell via OvmsDev wrote:

Since the following email I have high confidence the issue on the Leaf is related/caused by the poller as there has been no further occurrence and Chris has also experienced the car going to neutral on the new poller firmware. 

....
I haven't ruled out it being a fault with my car yet. Shortly after it faulted the car was run into so has been off the road for sometime, my first step was to replace 12V battery. The ovms unit is now unplugged and if it does not fault over the next month while driving I'll be reasonably confident it's ovms related.
 
Not sure which firmware version the poller updates were included in but it was only after upgrading to it that the errors occurred (which could be coincidental however it has faulted twice more both on version 3.3.004-141-gf729d82c). For periods where I reverted to 3.3.003 it was fine.
 
It might be useful to have an extra option on the enable can write to only enable it when the car is parked/charging.

 



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-- 
Michael Balzer * Am Rahmen 5 * D-58313 Herdecke
Fon 02330 9104094 * Handy 0176 20698926

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-- 
Michael Balzer * Am Rahmen 5 * D-58313 Herdecke
Fon 02330 9104094 * Handy 0176 20698926
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