Every 20 minutes (less 4 seconds)?

[Adrian Chadd]

.. run a tcpdump, see if it's sending an individual frame or two and
getting the TX watchdog confused?

Try a different switch?



Adrian

On 1 January 2013 21:30, Tim Kientzle <kientzle at freebsd.org> wrote:
> I'm trying to understand why the transmitter for the
> CPSW ethernet driver just stops sometimes.
>
> I just found a very perplexing clue:  It happens
> every 1196 seconds.
>
> I added a debug message with an HH:MM:SS
> timestamp whenever the watchdog sees the
> transmitter stop and this is what it printed out:
>
> 20:30:20 cpsw_tx_watchdog Watchdog resetting driver
> 20:50:16 cpsw_tx_watchdog Watchdog resetting driver
> 21:10:12 cpsw_tx_watchdog Watchdog resetting driver
> 21:30:09 cpsw_tx_watchdog Watchdog resetting driver
> 21:50:04 cpsw_tx_watchdog Watchdog resetting driver
> 22:10:01 cpsw_tx_watchdog Watchdog resetting driver
> 22:29:56 cpsw_tx_watchdog Watchdog resetting driver
> 22:49:52 cpsw_tx_watchdog Watchdog resetting driver
> 23:09:49 cpsw_tx_watchdog Watchdog resetting driver
> 23:29:45 cpsw_tx_watchdog Watchdog resetting driver
> 23:49:41 cpsw_tx_watchdog Watchdog resetting driver
> 00:29:33 cpsw_tx_watchdog Watchdog resetting driver
> 00:49:29 cpsw_tx_watchdog Watchdog resetting driver
> 01:29:21 cpsw_tx_watchdog Watchdog resetting driver
> 02:29:09 cpsw_tx_watchdog Watchdog resetting driver
> 03:28:57 cpsw_tx_watchdog Watchdog resetting driver
> 04:28:45 cpsw_tx_watchdog Watchdog resetting driver
> 05:28:31 cpsw_tx_watchdog Watchdog resetting driver
>
> (Note:  Some 20-minute intervals did seem to get skipped.
> There was no hang at 01:09, 01:49, 02:09, 02:49, etc.
> Maybe because the system was less busy then?  The
> network and processor load varied quite a bit over
> this 9 hour period.)
>
> Based on this, it would appear that "something"
> happens every 1196 seconds and if "something else"
> happens at that time the transmitter will hang.
>
> Does anyone recognize that particular period?
>
> Tim
>
> P.S. Cron isn't running, nor is there any other particularly
> periodic process.
>
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