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conf: add clockprecision directive

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Make the precision of the system clock configurable. This can be useful
on servers using hardware timestamping to reduce the amount of noise
added to the NTP timestamps and improve stability of NTP measurements.
This commit is contained in:
Miroslav Lichvar
2020-09-01 11:21:46 +02:00
parent 9ca250755f
commit b7c7c293e5
4 changed files with 46 additions and 15 deletions
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11
conf.c
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@@ -100,6 +100,7 @@ static double correction_time_ratio = 3.0;
static double max_clock_error = 1.0; /* in ppm */
static double max_drift = 500000.0; /* in ppm */
static double max_slew_rate = 1e6 / 12.0; /* in ppm */
static double clock_precision = 0.0; /* in seconds */
static SRC_AuthSelectMode authselect_mode = SRC_AUTHSELECT_MIX;
static double max_distance = 3.0;
@@ -544,6 +545,8 @@ CNF_ParseLine(const char *filename, int number, char *line)
parse_broadcast(p);
} else if (!strcasecmp(command, "clientloglimit")) {
parse_clientloglimit(p);
} else if (!strcasecmp(command, "clockprecision")) {
parse_double(p, &clock_precision);
} else if (!strcasecmp(command, "cmdallow")) {
parse_allow_deny(p, cmd_restrictions, 1);
} else if (!strcasecmp(command, "cmddeny")) {
@@ -2048,6 +2051,14 @@ CNF_GetMaxSlewRate(void)
/* ================================================== */
double
CNF_GetClockPrecision(void)
{
return clock_precision;
}
/* ================================================== */
double
CNF_GetMaxDistance(void)
{