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Add corrtimeratio directive

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The corrtimeratio directive controls the ratio between the
duration in which the clock is slewed for an average correction
according to the source history and the interval in which the
corrections are done (usually the NTP polling interval).  Corrections
larger than the average take less time and smaller corrections take
more time, the amount of the correction and the correction time are
inversely proportional.

Increasing corrtimeratio makes the overall frequency error of
the system clock smaller, but increases the overall time error as
the corrections will take longer.

By default, the ratio is 1, which means the duration of an average
correction will be close to the update interval.
This commit is contained in:
Miroslav Lichvar
2011-11-15 12:24:50 +01:00
parent 1b8deaf354
commit 9a01ccc07f
4 changed files with 60 additions and 3 deletions
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21
conf.c
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@@ -76,6 +76,7 @@ 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_corrtimeratio(const char *);
static void parse_reselectdist(const char *);
static void parse_stratumweight(const char *);
static void parse_peer(const char *);
@@ -122,6 +123,7 @@ static char *drift_file = NULL;
static char *rtc_file = NULL;
static unsigned long command_key_id;
static double max_update_skew = 1000.0;
static double correction_time_ratio = 1.0;
static double max_clock_error = 1.0; /* in ppm */
static double reselect_distance = 1e-4;
@@ -239,6 +241,7 @@ static const Command commands[] = {
{"dumpdir", 7, parse_dumpdir},
{"maxupdateskew", 13, parse_maxupdateskew},
{"maxclockerror", 13, parse_maxclockerror},
{"corrtimeratio", 13, parse_corrtimeratio},
{"commandkey", 10, parse_commandkey},
{"initstepslew", 12, parse_initstepslew},
{"local", 5, parse_local},
@@ -632,6 +635,16 @@ parse_maxclockerror(const char *line)
/* ================================================== */
static void
parse_corrtimeratio(const char *line)
{
if (sscanf(line, "%lf", &correction_time_ratio) != 1) {
LOG(LOGS_WARN, LOGF_Configure, "Could not read correction time ratio at line %d", line_number);
}
}
/* ================================================== */
static void
parse_reselectdist(const char *line)
{
@@ -1477,6 +1490,14 @@ CNF_GetMaxClockError(void)
/* ================================================== */
double
CNF_GetCorrectionTimeRatio(void)
{
return correction_time_ratio;
}
/* ================================================== */
double
CNF_GetReselectDistance(void)
{