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ntp: add filter option

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Add an option to use the median filter to reduce noise in measurements
before they are accumulated to sourcestats, similarly to reference
clocks. The option specifies how many samples are reduced to a single
sample.

The filter is intended to be used with very short polling intervals in
local networks where it is acceptable to generate a lot of NTP traffic.
This commit is contained in:
Miroslav Lichvar
2018-08-06 18:12:12 +02:00
parent 99e3045df4
commit 189aafde9d
5 changed files with 81 additions and 24 deletions
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5
doc/chrony.conf.adoc
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@@ -161,6 +161,11 @@ 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_:::
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.
*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