| Re: [chrony-users] Trouble with PPS |
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On Tue, Apr 17, 2018 at 08:28:43AM +0200, Alvaro Gamez wrote:
> #- GPS 0 4 377 28 +11ms[ +11ms] +/-
> 9045us
> #* PPS 0 4 377 27 +109us[ +105us] +/-
> 388us
>
> Why is GPS marked as not combined, though?
Because its distance (the +/- value) is significantly larger than the
PPS refclock's. Only PPS should be used for synchronization as it's a
much better time source.
You might want to add the noselect option to the GPS refclock
directive to not consider it for selection at all. Otherwise, it would
be good to at least increase its distance with the delay option to not
get two falsetickers if the offset between them changes. The example
in chrony.conf man page uses both.
--
Miroslav Lichvar
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