Re: [Linuxptp-users] The ptp4l is not sync sometimes.

[Takahiro S. <tsh...@gm...>]

Hello Richard,

Thank you for your response.

Yes, the hardware does have a limitation of dropping time stamps, and
> that stinks. The driver should try to read the time stamp ASAP. If
> dropped time stamps happens frequently, then you probably have a
> driver issue.
>
>
OK. It might be.


> I was able to use the IXP as a slave with a master sending one sync
> per second without any drop outs.
>
> What is your sync rate?
>

According to the capture of Wireshark, the sync rate is 1 second.
However sometimes Sync and FollowUp is sent shorter than 1 usec.
I think FollowUp message may be droped if the GbE driver is busy.


> > 2. Is my modification correct?
>
> A better fix is to drop event packets with missing time stamps in
> port.c.


Thank you. I will check it.

Thanks and Best regards,
Takahiro Shimizu