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Add small randomness to spacing between samples for one server

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This commit is contained in:
Miroslav Lichvar
2010-12-09 16:06:42 +01:00
parent d1b820e7e3
commit 833022b745
4 changed files with 26 additions and 6 deletions
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9
ntp_core.c
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@@ -178,6 +178,9 @@ struct NCR_Instance_Record {
minimise risk of network collisions) (in seconds) */
#define SAMPLING_SEPARATION 0.2
/* Randomness added to spacing between samples for one server/peer */
#define SAMPLING_RANDOMNESS 0.02
/* Spacing between samples in burst mode for one server/peer */
#define BURST_INTERVAL 2.0
@@ -247,6 +250,7 @@ start_initial_timeout(NCR_Instance inst)
/* Start timer for first transmission */
inst->timeout_id = SCH_AddTimeoutInClass(INITIAL_DELAY, SAMPLING_SEPARATION,
SAMPLING_RANDOMNESS,
SCH_NtpSamplingClass,
transmit_timeout, (void *)inst);
inst->timer_running = 1;
@@ -622,6 +626,7 @@ transmit_timeout(void *arg)
/* Requeue timeout */
inst->timer_running = 1;
inst->timeout_id = SCH_AddTimeoutInClass(WARM_UP_DELAY, SAMPLING_SEPARATION,
SAMPLING_RANDOMNESS,
SCH_NtpSamplingClass,
transmit_timeout, (void *)inst);
@@ -707,6 +712,7 @@ transmit_timeout(void *arg)
if (do_timer) {
inst->timer_running = 1;
inst->timeout_id = SCH_AddTimeoutInClass(timeout_delay, SAMPLING_SEPARATION,
SAMPLING_RANDOMNESS,
SCH_NtpSamplingClass,
transmit_timeout, (void *)inst);
} else {
@@ -1259,6 +1265,7 @@ receive_packet(NTP_Packet *message, struct timeval *now, double now_err, NCR_Ins
/* Get rid of old timeout and start a new one */
SCH_RemoveTimeout(inst->timeout_id);
inst->timeout_id = SCH_AddTimeoutInClass(delay_time, SAMPLING_SEPARATION,
SAMPLING_RANDOMNESS,
SCH_NtpSamplingClass,
transmit_timeout, (void *)inst);
}
@@ -1818,6 +1825,7 @@ NCR_InitiateSampleBurst(NCR_Instance inst, int n_good_samples, int n_total_sampl
}
inst->timer_running = 1;
inst->timeout_id = SCH_AddTimeoutInClass(0.0, SAMPLING_SEPARATION,
SAMPLING_RANDOMNESS,
SCH_NtpSamplingClass,
transmit_timeout, (void *) inst);
break;
@@ -1831,6 +1839,7 @@ NCR_InitiateSampleBurst(NCR_Instance inst, int n_good_samples, int n_total_sampl
}
inst->timer_running = 1;
inst->timeout_id = SCH_AddTimeoutInClass(0.0, SAMPLING_SEPARATION,
SAMPLING_RANDOMNESS,
SCH_NtpSamplingClass,
transmit_timeout, (void *) inst);
break;