Re: [Linuxptp-users] phc offset explodes after a while

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

On Fri, Jan 31, 2014 at 09:07:25AM +0000, Koehrer Mathias (ETAS/ESW5) wrote:
> > 2. What happens when you run with the roles reversed?
> >    Use ptp4l -s on host PCB.
> The same behaviour happens - now on the other PC.
> I think this is no wonder as both are using the same type of NIC.

But you said that you are running a different kernel (32/64 bit), and
so this is one variable to check.

> I wonder why the time presented by the testptp program does not fit to  the system time. Here is always a delta of about 35 seconds.

This 35 second difference is the current TAI-UTC offset. You should
make sure that your PTP clock is initialized with the TAI timescale,
if you want to run as a grand master clock.

(But this has nothing to do with the time jump that you are seeing.)
 
> I hope that helps to identify the issue.

>From what Matt Vick said, it sounds like there is a hardware issue
with this card.

Thanks,
Richard