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local: make maximum frequency offset configurable

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Add maxdrift directive to set the maximum assumed drift of the clock,
which sets the maximum frequency offset chronyd is allowed to use to
to correct the drift.
This commit is contained in:
Miroslav Lichvar
2016-03-22 17:07:46 +01:00
parent d70e815e9f
commit a12c7c422b
4 changed files with 32 additions and 6 deletions
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10
doc/chrony.conf.adoc
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@@ -805,6 +805,16 @@ By default, the maximum error is 1 ppm.
Typical values for _error-in-ppm_ might be 10 for a low quality clock and 0.1
for a high quality clock using a temperature compensated crystal oscillator.
[[maxdrift]]*maxdrift* _drift-in-ppm_::
This directive specifies the maximum assumed drift (frequency error) of the
system clock. It limits the frequency adjustment that *chronyd* is allowed to
use to correct the measured drift. It is an additional limit to the maximum
adjustment that can be set by the system driver (100000 ppm on Linux, 500 ppm
on FreeBSD and NetBSD, 32500 ppm on Solaris).
+
By default, the maximum assumed drift is 500000 ppm, i.e. the adjustment is
limited by the system driver rather than this directive.
[[maxupdateskew]]*maxupdateskew* _skew-in-ppm_::
One of *chronyd*'s tasks is to work out how fast or slow the computer's clock
runs relative to its reference sources. In addition, it computes an estimate of