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Base poll adjustment on number of sourcestats samples

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Instead of following skew changes, adjust polling interval so that the
number of measurements used in the regression algorithm remains close to
a target value. It can be configured with a new polltarget option
(6 by default).
This commit is contained in:
Miroslav Lichvar
2010-10-13 16:49:28 +02:00
parent d9596334c3
commit 7a6ee1d729
12 changed files with 88 additions and 50 deletions
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10
chrony.texi
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@@ -1861,8 +1861,8 @@ Local poll [10]
Remote poll [10]
@item
`Score' (an internal score within each polling level used to decide when
to increase or decrease the polling level. This is adjusted based on
changes to the variance of the measurements obtained from the source). [1]
to increase or decrease the polling level. This is adjusted based on number
of measurements currently being used for the regression algorithm). [1.0]
@item
The estimated local clock error (`theta' in RFC1305). Positive indicates that the local clock is slow. [-4.966e-03].
@item
@@ -2629,6 +2629,12 @@ selecting that source. This is useful with low stratum sources that are known
to be unrealiable or inaccurate and which should be used only when other
sources are unreachable.
@item polltarget
Target number of measurements to use for the regression algorithm which
@code{chronyd} will try to maintain by adjusting polling interval between
@code{minpoll} and @code{maxpoll}. A higher target makes @code{chronyd} prefer
shorter polling intervals. The default is 6 and a useful range is 6 to 60.
@item prefer
Prefer this source over sources without prefer option.