Re: [Linuxptp-users] Getting big offsets with phc2sys

[Joseph M. <jos...@gm...>]

The driver does read the time over MDIO. It takes around ~100usec.
Are there some known tricks in cases like this ?

Regards,
Joseph

On Thu, May 20, 2021 at 6:28 PM Richard Cochran <ric...@gm...>
wrote:

> On Wed, May 19, 2021 at 10:31:00PM +0300, Joseph Matan wrote:
> > *Platform:*
> >
> > My board is running with KSZ9477 switch (with HW timestamping support) on
> > linux 4.19.
>
> I guess that the time is read over MDIO.  If so, that explains the
> jitter in the measured offsets.
>
> HTH,
> Richard
>