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Select source with minimum distance using a scoring system

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Each source has a score against currently selected source which is
updated (multiplied by ratio of their distances) when one of the two
sources has a new sample. When the score reaches a limit, the source
will be selected. This should allow to slowly select the source with
minimum distance without frequent reselecting.

To avoid switching between sources with very variable distances (e.g. on
LAN or when upstream server uses a longer polling interval), sources
that are currently not selected are penalized by a fixed distance. This
can be configured with new reselectdist directive (100 microseconds by
default).
This commit is contained in:
Miroslav Lichvar
2011-01-24 17:09:00 +01:00
parent 222198acf3
commit db510a9558
4 changed files with 121 additions and 27 deletions
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conf.h
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@@ -78,6 +78,7 @@ extern void CNF_GetLinuxFreqScale(int *set, double *freq_scale);
/* Value returned in ppm, as read from file */
extern double CNF_GetMaxUpdateSkew(void);
extern double CNF_GetMaxClockError(void);
extern double CNF_GetReselectDistance(void);
extern int CNF_AllowLocalReference(int *stratum);
extern void CNF_SetupAccessRestrictions(void);