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ntp: rework filter option to count missing samples

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Instead of waiting for the sample filter to accumulate the specified
number of samples and then deciding if the result is acceptable, count
missing samples and get the result after the specified number of polls.

This should work better when samples are dropped at a high rate. The
source and clock update interval will be stable as long as at least
one sample can be collected.
This commit is contained in:
Miroslav Lichvar
2022-07-19 16:28:32 +02:00
parent a16094adfb
commit 4234732b08
2 changed files with 27 additions and 22 deletions
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9
doc/chrony.conf.adoc
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@@ -176,11 +176,12 @@ 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.
*filter* _samples_:::
*filter* _polls_:::
This option enables a median filter to reduce noise in NTP measurements. The
filter will reduce the specified number of samples to a single sample. It is
intended to be used with very short polling intervals in local networks where
it is acceptable to generate a lot of NTP traffic.
filter will process samples collected in the specified number of polls
into a single sample. It is intended to be used with very short polling
intervals in local networks where it is acceptable to generate a lot of NTP
traffic.
*offline*:::
If the server will not be reachable when *chronyd* is started, the *offline*
option can be specified. *chronyd* will not try to poll the server until it is