Re: [Linuxptp-users] pmc:: uds: sendto failed: No such file or directory

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

On Fri, Nov 04, 2016 at 08:25:04AM +1100, David Mirabito wrote:
> Very occasionally I'm noticing that this fails, and I have a message in
> syslog:
> 
> user.err pmc: [94758.014] uds: sendto failed: No such file or directory

This is a regression in v1.6 that was fixed in v1.7:

   3938cbc uds: Prevent unintentional announce message timeouts.

You can cherry pick that onto v1.6 or just switch to v1.7.

> And it periodically logs (with gaps of 158, 28, 168, 56, 168 seconds
> between the messages that I looked at) that:
> 
> Oct 20 21:13:23 user.notice ptp4l: [94820.538] selected best master clock
> 000cec.fffe.08046f
> 
> Is this expected, the constant reminder that the same BMC is chosen time
> after time, or would this be considered strange?

This effect is normal, caused by any change in the master's data set.
Honest GPS masters will update the grandmasterClockAccuracy field
according to the current state of the GPS.

Thanks,
Richard