Re: [Linuxptp-users] poll tx timestamp timeout

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

On Wed, Aug 14, 2013 at 12:56:02AM -0700, David Gravereaux wrote:
> On 08/14/2013 12:01 AM, Richard Cochran wrote:
> 
> > Which messages are affected, sync, peer delay request, or both?
> 
> Not sure. It causes the master to change to the switch, then it grabs it
> back after it recovers.  I would assume a sync

You can see this in the log on the line after the failure ...

> ptp4l[88356.177]: assuming the grand master role
> ptp4l[95586.834]: poll tx timestamp timeout
> ptp4l[95586.834]: port 1: send sync failed
                                 ^^^^
here.

> >> I've increased 'tx_timestamp_timeout' to 10ms, but has happened a few
> >> more times even when run with an increased priority such as:

...

> $ grep ^CONFIG_HZ /boot/config-3.8.0-27-generic
> CONFIG_HZ_250=y
> CONFIG_HZ=250
> 
> period of 250Hz is 4ms    (interesting)

So 10 ms might not be enough for this system. Try 100 ms.

Thanks,
Richard