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ntp: add burst option

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When the burst option is specified in the server/pool directive and the
current poll is longer than the minimum poll, initiate on each poll a
burst with 1 good sample and 2 or 4 total samples according to the
difference between the current and minimum poll.
This commit is contained in:
Miroslav Lichvar
2018-02-27 17:35:16 +01:00
parent 7d100b89fc
commit d0eb9427c2
7 changed files with 28 additions and 0 deletions
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doc/chrony.conf.adoc
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@@ -83,6 +83,13 @@ With this option, the interval between the first four requests sent to the
server will be 2 seconds instead of the interval specified by the *minpoll*
option, which allows *chronyd* to make the first update of the clock shortly
after start.
*burst*:::
With this option, *chronyd* will shorten the interval between up to four
requests to 2 seconds when it cannot get a good measurement from the server.
The number of requests in the burst is limited by the current polling interval
to keep the average interval at or above the minimum interval, i.e. the current
interval needs to be at least two times longer than the minimum interval in
order to allow a burst with two requests.
*key* _ID_:::
The NTP protocol supports the inclusion of checksums in the packets, to prevent
computers having their system time upset by rogue packets being sent to them.