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client: add second form of makestep command

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The second form configures the automatic stepping, similarly to the
makestep directive. It has two parameters, stepping threshold (in
seconds) and number of future clock updates for which will be the
threshold active. This can be used with the burst command to quickly
make a new measurement and correct the clock by stepping if needed,
without waiting for chronyd to complete the measurement and update the
clock.
This commit is contained in:
Miroslav Lichvar
2014-12-08 17:54:08 +01:00
parent 4b81cda521
commit 513e65900c
7 changed files with 80 additions and 15 deletions
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26
chrony.texi.in
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@@ -3231,7 +3231,7 @@ interface.
* exit command:: Exit from chronyc
* help command:: Generate help summary
* local command:: Let computer be a server when it is unsynchronised
* makestep command:: Immediately correct the system clock instead of slewing
* makestep command:: Correct the system clock by stepping instead of slewing
* manual command:: Enable/disable/configure options for settime
* maxdelay command:: Set max measurement delay for a source
* maxdelaydevratio command:: Set max measurement delay for a source as ratio to deviation
@@ -3702,17 +3702,27 @@ offset, by slowing down or speeding up the clock as required. In
certain situations, the system clock may be so far adrift that this
slewing process would take a very long time to correct the system clock.
The @code{makestep} command can be used in this situation. It cancels
any remaining correction that was being slewed, and jumps the system
clock by the equivalent amount, making it correct immediately.
The @code{makestep} command can be used in this situation. There are two forms
of the command. The first form has no parameters. It tells @code{chronyd} to
cancel any remaining correction that was being slewed and jump the system clock
by the equivalent amount, making it correct immediately.
The second form configures the automatic stepping, similarly to the
@code{makestep} directive (@pxref{makestep directive}). It has two parameters,
stepping threshold (in seconds) and number of future clock updates for which
will be the threshold active. This can be used with the @code{burst} command
to quickly make a new measurement and correct the clock by stepping if needed,
without waiting for @code{chronyd} to complete the measurement and update the
clock.
@example
makestep 0.1 1
burst 1/2
@end example
BE WARNED - certain software will be seriously affected by such jumps to
the system time. (That is the reason why chronyd uses slewing
normally.)
The @code{makestep} directive in the configuration file can be used
to step the clock automatically when the adjustment is larger than a
specified threshold, see @ref{makestep directive}.
@c }}}
@c {{{ manual
@node manual command