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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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12
doc/chrony.conf.adoc
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@@ -218,6 +218,12 @@ Set the minimum number of samples kept for this source. This overrides the
*maxsamples* _samples_:::
Set the maximum number of samples kept for this source. This overrides the
<<maxsamples,*maxsamples*>> directive.
*maxunreach* _polls_:::
This option specifies the maximum number of polls that this source can stay
selected for synchronisation when it is unreachable (i.e. no valid response was
received to the last 8 requests). Only sources with at least one sample more
recent than the oldest sample of all reachable sources can be selected. The
default is 100000.
*filter* _polls_:::
This option enables a median filter to reduce noise in NTP measurements. The
filter will process samples collected in the specified number of polls
@@ -731,6 +737,12 @@ Set the minimum number of samples kept for this source. This overrides the
*maxsamples* _samples_:::
Set the maximum number of samples kept for this source. This overrides the
<<maxsamples,*maxsamples*>> directive.
*maxunreach* _polls_:::
This option specifies the maximum number of polls that this source can stay
selected for synchronisation when it is unreachable (i.e. no valid sample was
received in the last 8 polls). Only sources with at least one sample more
recent than the oldest sample of all reachable sources can be selected.
The default is 100000.
[[manual]]*manual*::
The *manual* directive enables support at run-time for the