Re: [chrony-users] Chrony source selection algorithm documentation

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On Sat, Mar 12, 2016 at 08:15:48AM +0100, Henrik Bieler wrote:
> Hey Miroslav,
> thank you for your input. This works indeed. :-)
> When chrony has selected the GPS and the stratum 1 ntp servers come
> online, chrony selects one of them.
> So far I could not yet observe chrony switching back to gps when the
> servers go offline. The servers are still shown in "chronyc sources" as
> selected. But maybe I just need to give it more time.

A refclock using NMEA messages is usually much worse than an NTP
server. It may take a while before the estimated error of the NTP
sources becomes larger than the error of the refclock and chronyd
reselects. With chrony < 2.0 you can force the reselection to happen
sooner by not switching the NTP sources to the offline state via
chronyc. After 8 unanswered requests they will become "unreachable"
and will be ignored in the source selection. In chrony >= 2.0 that
wouldn't make a difference.

Miroslav Lichvar

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