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ntp: allow sub-second polling intervals

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Change the minimum minpoll to -4, but keep the minimum maxpoll at 0 in
order to not make it too easy to flood distant servers.
This commit is contained in:
Miroslav Lichvar
2017-01-19 10:31:58 +01:00
parent 4e78975909
commit beaaaad162
2 changed files with 16 additions and 11 deletions
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8
doc/chrony.conf.adoc
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@@ -68,11 +68,15 @@ options:
Although *chronyd* will trim the rate at which it samples the server during
normal operation, the user might want to constrain the minimum polling interval.
This is always defined as a power of 2, so *minpoll 5* would mean that the
polling interval cannot drop below 32 seconds. The default is 6 (64 seconds).
polling interval cannot drop below 32 seconds. The default is 6 (64 seconds),
the minimum is -4 (1/16th of a second), and the maximum is 24 (6 months). Note
that intervals shorter than 6 (64 seconds) should generally not be used with
public servers on the Internet as their administrators may consider it abuse.
*maxpoll* _poll_:::
In a similar way, the user might want to constrain the maximum polling interval.
Again this is specified as a power of 2, *maxpoll 9* indicates that the polling
interval must stay at or below 512 seconds. The default is 10 (1024 seconds).
interval must stay at or below 512 seconds. The default is 10 (1024 seconds),
the minimum is 0 (1 second), and the maximum is 24 (6 months).
*iburst*:::
If this option is set, the interval between the first four polls will be 2
seconds instead of _minpoll_. This is useful to quickly get the first update of