| Re: [chrony-users] help - UTC time of PPS pulses |
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- To: chrony-users@xxxxxxxxxxxxxxxxxxxx
- Subject: Re: [chrony-users] help - UTC time of PPS pulses
- From: Miroslav Lichvar <mlichvar@xxxxxxxxxx>
- Date: Wed, 14 Oct 2020 12:33:38 +0200
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On Wed, Oct 14, 2020 at 10:23:58AM +0000, Yoed Stavi wrote:
> We have chronyd configured with a reference NTP server and a PPS in addition.
> In my understanding this configuration sets the time according to the NTP server and then maintains the frequency with the PPS.
No, chronyd doesn't support a frequency-only source, PPS or not PPS.
It could be a useful feature, but currently all sources are used to
adjust both phase and frequency.
> I was under the assumption that the GPS pulses are not precisely aligned with whole UTC seconds.
> I need to know the offset between the pulses and the UTC seconds in order to create timestamps that are relative to the pulses rather than UTC seconds.
Usually, it's best to just use the system clock.
--
Miroslav Lichvar
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