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sources: add option to limit selection of unreachable sources

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Add maxunreach option to NTP sources and refclocks to specify the
maximum number of polls that the source can stay selected for
synchronization when it is unreachable (i.e. no valid sample was
received in the last 8 polls).

It is an additional requirement to having at least one sample more
recent than the oldest sample of reachable sources.

The default value is 100000. Setting the option to 0 disables selection
of unreachable sources, which matches RFC 5905.
This commit is contained in:
Miroslav Lichvar
2025-08-05 16:08:40 +02:00
parent be7f5e8916
commit 9b183fe98f
16 changed files with 108 additions and 15 deletions
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doc/chronyc.adoc
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@@ -479,7 +479,8 @@ synchronisation:
* _~_ - has a jitter larger than the maximum jitter (configured by the
<<chrony.conf.adoc#maxjitter,*maxjitter*>> directive).
* _w_ - waits for other sources to get out of the _M_ state.
* _S_ - has older measurements than other sources.
* _S_ - has only measurements older than reachable sources, or is unreachable
for too many polls (configured by the *maxunreach* option).
* _O_ - has a stratum equal or larger than the orphan stratum (configured by
the <<chrony.conf.adoc#local,*local*>> directive).
* _T_ - does not fully agree with sources that have the *trust* option.