Derek,

Am 03.05.24 um 12:53 schrieb Derek Caudwell via OvmsDev:

When running firmware  3.3.004-74-gbd4e7196 on my Nissan Leaf I suspect (but can't be 100% sure as it's only been 24h without fault) the new poller caused the car to throw the attached faults from overloading the can bus whilst driving. The fault was sufficient to send the car into limp mode and could not be driven until cleared with LeafSpy.

Build 3.3.004-74 (released 2024-04-30) did not yet include the poller tracing control, i.e. it did lots of logging for frames, significantly affecting overall performance.

Poller tracing control was introduced in https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/commit/7e4046042a99339d0212aac8f874cc8f780e634e on May 12.

That commit was first included in build 3.3.004-103-g11fddbf6 released 2024-05-25. Do you remember testing that build or a later one?


But as I still don't understand how a software queue overflow could cause a bus crash, I've also checked the 500 kbit timing for the MCP2515 and found that may have the same issue as the 125 kbit timing:

Our timing is:
  case CAN_SPEED_500KBPS:
    cnf1=0x00; cnf2=0xf0; cnf3=0x86;
  = PROP=1, PS1=7, PS2=7, SJW=1, Sample 3x @56.3%

Remember, the SAE/CiA recommendation is SJW=2, Sample 1x @87.5%. That would translate to:
  PROP=5, PS1=8, PS2=2, SJW=2, Sample 1x @87.5% =
    cnf1=0x40; cnf2=0xbc; cnf3=0x81;

I also checked the Arduino MCP_CAN lib, and that uses:
    cnf1=0x40; cnf2=0xe5; cnf3=0x83;
  = PROP=6, PS1=5, PS2=4, SJW=2, Sample 3x @75%

So our timing for 500 kbit/s on the MCP buses also isn't as recommended.

Derek, could you test the SAE/CiA recommendation and the MCP_CAN config as shown? Or anyone else with a live can2/can3 bus at 500 kbit?

If these work, the question is which is the more general setup we should adopt. Apparently the MCP_CAN lib also does not follow the CiA recommendation, I wonder if the MCP_CAN config is a compromise for compatibility.

Regards,
Michael

Am 19.01.25 um 19:07 schrieb Derek Caudwell via OvmsDev:

Hi Michael 

I just used the firmware stock with no changes to the poller settings.

The Leaf is using high speeds on both buses:

RegisterCanBus(1,CAN_MODE_ACTIVE,CAN_SPEED_500KBPS);

  RegisterCanBus(2,CAN_MODE_ACTIVE,CAN_SPEED_500KBPS);

On Sun, 19 Jan 2025, 10:15 pm Michael Balzer via OvmsDev, <ovmsdev@lists.openvehicles.com> wrote:

Michael,

I suggest adding a standard bool member variable to reflect if any filter is defined, so `PollerRxCallback()` can just skip the filter test while that is false. A mutex has some overhead, even if used non-blocking, and a bool variable only read there will be sufficient to signal "apply filtering" to the callback. With the simple bool test, all vehicles that don't need filtering (i.e. most vehicles) will have a neglectible impact from this.


Regarding the overhead: the GCC atomic implementation should use the xtensa CPU builtin atomic support (SCOMPARE1 register & S32C1I instruction), so should be pretty fast and not use any interrupt disabling, see:

• https://gcc.gnu.org/wiki/Atomic (xtensa atomic support since gcc 4.4.0)
  
• https://www.cadence.com/content/dam/cadence-www/global/en_US/documents/tools/silicon-solutions/compute-ip/isa-summary.pdf (section 4.3.13)

So I still doubt the queue overflow is the real culprit.

But having the filter option doesn't hurt (with my suggestion above), and your changes to the queue processing look promising as well.

@Derek: what was your poller tracing & timing setup when you had the bus issue on the Leaf? I still think that was something related to your car or setup. There are currently 11 Leafs on my server running "edge" releases including the new poller, all without (reported) issues.

Regards,
Michael

Am 19.01.25 um 04:26 schrieb Michael Geddes:

P/R Created

https://github.com/openvehicles/Open-Vehicle-Monitoring-System-3/pull/1100

Let me know if you want me to split it up or ANY changes and I'll get onto it asap.

Maybe somebody could grab the code and check it out in the context of specifying some filters.  This will prevent those messages from coming to the vehicle implementation at all.. and even from going through the poller queue.  It is non-blocking meaning that the filter is briefly inopperational while the filter is being modified.  

 

//.

On Sun, 19 Jan 2025 at 11:02, Michael Geddes <frog@bunyip.wheelycreek.net> wrote:

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.

I have a feeling that the atomic operations are along the lines of:

* Set Interrupts off

* atomic operation

* Set interrupts on

Which means no real 'blocking' .. just not allowing interrupts and therefor task switching for a couple of instructions.

 

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