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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
----
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
extension field containing an additional timestamp to enable frequency transfer
and significantly improve stability of synchronisation. It can be enabled by