On Tue, Jun 19, 2018 at 11:03:22PM +0200, Yan Yankovskyi via Linuxptp-users 
wrote:
> I use the following settings: logSyncInterval = -5 and summary_interval =
> -5. I see synchronization messages approximately every 30 ms, as expected.

You shouldn't do that.  Printing messages takes time, and delaying
during such a tight interval can actually hurt performance.

> But with free_running = 1 option, synchronization occurs once a second.

It doesn't synchronization when free_running=1.  But it does print a
message.  The log message interval will be the sum of summary_interval
and freq_est_interval.

HTH,
Richard

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