On 1/14/2021 11:30 AM, Ankur Sharma wrote:
> Hi Jacob, Linux PTP members,
>
> We saw that we have an e1000e module installed on the systems where we
> are seeing phc2sys offset spikes.
>
The device you listed is using the igb driver module, not e1000e.
> _Output of *lsmod | grep ptp*_
> ptp 19231 7 igb,e1000e,mlx4_en,mlx5_core
>
> We tried to create the setup in our lab with the above kernel and OS
> version and also installed the e1000e module but we are not seeing
> spikes in this setup.
>
> Any other pointers or details around this issue?
>
I would recommend attempting to use a newer kernel such as a newer
stable 5.10 kernel if you can.
I believe both e1000e and igb have had issues that were worked around in
the driver software, so it is quite possible that the issue has been fixed.
I do not recall the specific commits that fixed issues like this, and I
know it is also specific to which revisions of various hardware chips.
The only recent/relevant fix I could find in the igb source code appears
to be:
v4.20 included:
4c9b658eeaef ("igb: shorten maximum PHC timecounter update interval")
e1000e-based HW has had more troubles, but you don't appear to be using
that driver.
Thanks,
Jake
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