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refclock: add local option

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Add "local" option to specify that the reference clock is an
unsynchronized clock which is more stable than the system clock (e.g.
TCXO, OCXO, or atomic clock) and it should be used as a local standard
to stabilize the system clock.

Handle the local refclock as a PPS refclock locked to itself which gives
the unsynchronized status to be ignored in the source selection. Wait
for the refclock to get at least minsamples samples and adjust the clock
directly to follow changes in the refclock's sourcestats frequency and
offset.

There should be at most one refclock specified with this option.
This commit is contained in:
Miroslav Lichvar
2022-02-22 11:24:00 +01:00
parent af6ae9186b
commit 62757cda49
5 changed files with 110 additions and 3 deletions
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7
doc/chrony.conf.adoc
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@@ -624,6 +624,13 @@ and that *chronyd* should correct its offset by the current TAI-UTC offset. The
<<leapsectz,*leapsectz*>> directive must be used with this option and the
database must be kept up to date in order for this correction to work as
expected. This option does not make sense with PPS refclocks.
*local*:::
This option specifies that the reference clock is an unsynchronised clock which
is more stable than the system clock (e.g. TCXO, OCXO, or atomic clock) and
it should be used as a local standard to stabilise the system clock. The
refclock will bypass the source selection. There should be at most one refclock
specified with this option and it should have the shortest polling interval
among all configured sources.
*minsamples* _samples_:::
Set the minimum number of samples kept for this source. This overrides the
<<minsamples,*minsamples*>> directive.