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ntp: rework initial burst

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Instead of making the initial burst only once and immediately after
chronyd start (even when iburst is specified together with the offline
option), trigger the burst whenever the connectivity changes from
offline to online.
This commit is contained in:
Miroslav Lichvar
2020-06-23 13:10:02 +02:00
parent 8882fb21e0
commit b0fe443632
4 changed files with 37 additions and 25 deletions
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12
doc/chrony.conf.adoc
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@@ -82,13 +82,13 @@ interval should stay at or below 9 (512 seconds). The default is 10 (1024
seconds), the minimum is -6 (1/64th of a second), and the maximum is 24 (6
months).
*iburst*:::
With this option, the interval between the first four requests sent to the
server will be 2 seconds or less instead of the interval specified by the
*minpoll* option, which allows *chronyd* to make the first update of the clock
shortly after start.
With this option, *chronyd* will start with a burst of 4-8 requests in order to
make the first update of the clock sooner. It will also repeat the burst every
time the source is switched from the offline state to online with the
<<chronyc.adoc#online,*online*>> command in *chronyc*.
*burst*:::
With this option, *chronyd* will shorten the interval between up to four
requests to 2 seconds or less when it cannot get a good measurement from the
With this option, *chronyd* will send a burst of up to 4 requests 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