On Fri, Oct 27, 2017 at 07:46:26AM +0200, Miroslav Lichvar wrote:
> If a very short sync interval is used and the process may run up to 20
> milliseconds late, then yes, I think it's expected that the clock
> check in default configuration will have false positives.

Right.
 
> You may want to increase or disable sanity_freq_limit.

Or reduce latency by running the ptp4l process with sched_fifo and
high priority (see chrt(1)).

Thanks,
Richard



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