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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] PPS-only PHC refclock
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Wed, 23 Feb 2022 15:12:21 +0100
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On Wed, Feb 02, 2022 at 09:31:10AM +0100, Miroslav Lichvar wrote:
> On Tue, Feb 01, 2022 at 02:37:20PM -0700, Joe Williams wrote:
> > In this test set up chronyc sources shows the PHC PPS-only refclock as a
> > falseticker and synchronizes fine with the FB time server. Which is why I
> > was wondering if it needed to be disciplined in some way to make it useful.
>
> It needs to be synchronized. chronyd cannot use a time source for
> frequency only.
The latest code in git has a new "local" option to use stable
free-running refclocks (e.g. TCXO, OCXO, atomic clock) for
stabilization of the system clock, e.g.
refclock PHC /dev/ptp0 local poll 0
To take advantage of the improved stability, other sources specified
in the config file should use a longer polling interval and/or the
filter option, and possibly also set minsamples to 64.
--
Miroslav Lichvar
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