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Add corrtimeratio directive

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The corrtimeratio directive controls the ratio between the
duration in which the clock is slewed for an average correction
according to the source history and the interval in which the
corrections are done (usually the NTP polling interval).  Corrections
larger than the average take less time and smaller corrections take
more time, the amount of the correction and the correction time are
inversely proportional.

Increasing corrtimeratio makes the overall frequency error of
the system clock smaller, but increases the overall time error as
the corrections will take longer.

By default, the ratio is 1, which means the duration of an average
correction will be close to the update interval.
This commit is contained in:
Miroslav Lichvar
2011-11-15 12:24:50 +01:00
parent 1b8deaf354
commit 9a01ccc07f
4 changed files with 60 additions and 3 deletions
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chrony.texi
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@@ -1173,6 +1173,7 @@ directives can occur in any order in the file.
* cmdallow directive:: Give control access to chronyc on other computers
* cmddeny directive:: Deny control access to chronyc on other computers
* commandkey directive:: Set runtime command key
* corrtimeratio directive:: Set correction time ratio
* cmdport directive:: Set port to use for runtime commanding
* deny directive:: Deny access to NTP clients
* driftfile directive:: Specify location of file containing drift data
@@ -1493,6 +1494,35 @@ cmdport 257
This would make @code{chronyd} use 257/udp as its command port.
(@code{chronyc} would need to be run with the @code{-p 257} switch to
inter-operate correctly).
@c }}}
@c {{{ corrtimeratio
@node corrtimeratio directive
@subsection corrtimeratio
When @code{chronyd} makes a time correction, it controls how quickly
the system clock is slewed (so far only on Linux). This rate
temporarily affects the frequency error of the system clock.
The @code{corrtimeratio} directive controls the ratio between the
duration in which the clock is slewed for an average correction
according to the source history and the interval in which the
corrections are done (usually the NTP polling interval). Corrections
larger than the average take less time and smaller corrections take
more time, the amount of the correction and the correction time are
inversely proportional.
Increasing @code{corrtimeratio} makes the overall frequency error of
the system clock smaller, but increases the overall time error as
the corrections will take longer.
By default, the ratio is 1, which means the duration of an average
correction will be close to the update interval.
The syntax is
@example
corrtimeratio 10
@end example
@c }}}
@c {{{ deny
@node deny directive