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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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23
conf.c
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@@ -78,6 +78,7 @@ static void parse_logbanner(const char *);
static void parse_logdir(const char *);
static void parse_maxupdateskew(const char *);
static void parse_maxclockerror(const char *);
static void parse_reselectdist(const char *);
static void parse_peer(const char *);
static void parse_acquisitionport(const char *);
static void parse_port(const char *);
@@ -123,6 +124,8 @@ static unsigned long command_key_id;
static double max_update_skew = 1000.0;
static double max_clock_error = 10; /* in ppm */
static double reselect_distance = 1e-4;
static int cmd_port = -1;
static int do_log_measurements = 0;
@@ -258,6 +261,7 @@ static const Command commands[] = {
{"pidfile", 7, parse_pidfile},
{"broadcast", 9, parse_broadcast},
{"tempcomp", 8, parse_tempcomp},
{"reselectdist", 12, parse_reselectdist},
{"linux_hz", 8, parse_linux_hz},
{"linux_freq_scale", 16, parse_linux_freq_scale},
{"sched_priority", 14, parse_sched_priority},
@@ -609,6 +613,16 @@ parse_maxclockerror(const char *line)
/* ================================================== */
static void
parse_reselectdist(const char *line)
{
if (sscanf(line, "%lf", &reselect_distance) != 1) {
LOG(LOGS_WARN, LOGF_Configure, "Could not read reselect distance at line %d in file", line_number);
}
}
/* ================================================== */
static void
parse_driftfile(const char *line)
{
@@ -1431,6 +1445,14 @@ CNF_GetMaxClockError(void)
/* ================================================== */
double
CNF_GetReselectDistance(void)
{
return reselect_distance;
}
/* ================================================== */
int
CNF_GetManualEnabled(void)
{
@@ -1637,3 +1659,4 @@ CNF_GetTempComp(char **file, double *interval, double *T0, double *k0, double *k
*k1 = tempcomp_k1;
*k2 = tempcomp_k2;
}