| Re: [chrony-users] gpsd, pps and chrony |
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On Mon, Mar 21, 2011 at 06:15:57PM +0100, Damien Rigoni wrote:
> > PPS and SHM refclocks are very different, the former provides only
> > subsecond time information, it needs another source to get the missing
> > seconds. The PPS samples received by SHM refclock are already paired
> > with NMEA messages and completed in gpsd, so using only the SHM 1
> > refclock alone is perfectly fine and I'd say maybe even recommended.
> >
>
> Well you suggest that I only need something like that ?
> refclock SHM 1 poll 4 refid PPS
Yes, that should work fine, as long as a recent gpsd version is used.
I think versions before 2.90 didn't pair the NMEA and PPS samples and
needed chrony/ntp to sync first to the NMEA source and only then it
would start sending the PPS samples.
--
Miroslav Lichvar
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