> -----Original Message-----
> From: Richard Cochran <richardcoch...@gmail.com>
> Sent: Monday, June 07, 2021 11:42 AM
> To: Geva, Erez <erez.geva....@siemens.com>
> Cc: linuxptp-devel@lists.sourceforge.net
> Subject: Re: [Linuxptp-devel] Intel 210 to Intel 255
>
> On Mon, Jun 07, 2021 at 02:01:28PM +0000, Geva, Erez wrote:
>
> > Jun 7 15:44:07 ipc01 ptp4l: [673.869] timed out while polling for tx
> > timestamp
> > Jun 7 15:44:07 ipc01 ptp4l: [673.869] increasing tx_timestamp_timeout may
> correct this issue, but it is likely caused by a driver bug
>
> Try --tx_timestamp_timeout=100
>
> HTH,
> Richard
>
I would recommend this as well, even for the i210. At least to rule out whether
or not the issue still exists if you extend the timeout.
The timestamp is captured via interrupt, but I believe the igb driver might
still rely on a work thread to actually finish reporting the timestamp. Even if
it doesn't, there is some delay before the device gets notified of the
timestamp, as well as further delay caused by reading the timestamp register.
While it should still take less than the 1millisecond of time, I definitely
recall cases where it took long enough to exceed the time limit in the worst
case.
Thanks,
Jake
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