Re: [Linuxptp-users] ptp4l results in stable master offset, but phc2sys usually see some spike in offset (10000+)

[Richard C. <ric...@gm...>]

On Sun, Feb 07, 2021 at 05:55:40PM +0000, Sean Ma wrote:

> The delay value didn't jump up, so it indicates device driver or
> hardware issue. Are we then referring to the I350 NIC device driver
> and hardware issue?

Yes.

> This issue was happening for around 10 hours, then disappears for
> 3-4 days then coming back.

Sounds like driver and/or hardware.

> I was thinking if there is any possibility that the Linux software
> clock was drifting causing the jump/offset, and the NIC PHC is
> correcting it through phc2sys.

Yes, that is a possibility.  Make sure there no other programs running
that adjust the system time, like ntpd, chrony, systemd-timesync, etc.

Thanks,
Richard