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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] Syncromisation confusion
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Tue, 23 Mar 2021 16:07:40 +0100
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On Tue, Mar 23, 2021 at 03:57:56PM +0100, Mattias Winther wrote:
> > It sounds like that PHC is not synchronized to anything. Is it
> > supposed to be synchronized by ptp4l in a PTP domain?
>
> Yeah, that is right, it doesn’t sync. I got the impression that the refclock in pps mode was keeping the tempo, so to speak, and then would use the ntp server data to get the rest of the timestamp from, but from your question I get the feeling this is not what PHC pps mode does?
In the pps mode it still needs to be synchronized. It just ignores a
whole number of seconds in the offset, e.g. due to TAI-UTC mismatch.
chronyd cannot use a reference clock for frequency only. I'm not sure
if a free-running PHC would be a good frequency reference anyway.
--
Miroslav Lichvar
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