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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] tempcomp and fallbackdrift
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Mon, 26 May 2025 15:18:04 +0200
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On Mon, May 26, 2025 at 01:30:19PM +0200, Christoph Schittel wrote:
> When are tempcomp corrections applied to the system clock? Additional with
> the slewing from the source synchronisation? Will the temcomp corrections
> applied in holdover mode additive to fallbackdrift corrections?
tempcomp corrections are applied all the time in the configured
interval, even if there is no synchronization. It's at a lower
level than fallbackdrift or reference clock updates from NTP/refclocks.
>
> What are the correctiona to system clock due to fallbackdrift after
> max-interval?
Only tempcomp.
> I am aiming for best holdover performance, when no sync is possible for a
> long time. No stratum 0 or PPS signal available.
I'm not sure how much sense it makes to combine tempcomp and
fallbackdrift. If tempcomp is working correctly, fallbackdrift should
not be effective. It should see just noise, no periodic patterns
corresponding to temperature that would be averaged out.
--
Miroslav Lichvar
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