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doc: mention maxdelayquant in FAQ

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Miroslav Lichvar 2022-08-10 15:32:54 +02:00
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doc/faq.adoc
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@ -345,6 +345,15 @@ server ntp.local minpoll -6 maxpoll -6 filter 15 xleave
hwtimestamp eth0 minpoll -6 hwtimestamp eth0 minpoll -6
---- ----
Since `chrony` version 4.3, the minimum `minpoll` is -7 and a filter using a
long-term estimate of a delay quantile can be enabled by the `maxdelayquant`
option to replace the default `maxdelaydevratio` filter, which is sensitive to
outliers corrupting the minimum delay. For example:
----
server ntp.local minpoll -7 maxpoll -7 filter 31 maxdelayquant 0.3 xleave
----
As an experimental feature added in version 4.2, `chronyd` supports an NTPv4 As an experimental feature added in version 4.2, `chronyd` supports an NTPv4
extension field containing an additional timestamp to enable frequency transfer extension field containing an additional timestamp to enable frequency transfer
and significantly improve stability of synchronisation. It can be enabled by and significantly improve stability of synchronisation. It can be enabled by