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ntp: add burst option

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When the burst option is specified in the server/pool directive and the
current poll is longer than the minimum poll, initiate on each poll a
burst with 1 good sample and 2 or 4 total samples according to the
difference between the current and minimum poll.
This commit is contained in:
Miroslav Lichvar
2018-02-27 17:35:16 +01:00
parent 7d100b89fc
commit d0eb9427c2
7 changed files with 28 additions and 0 deletions
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14
ntp_core.c
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@@ -88,6 +88,7 @@ struct NCR_Instance_Record {
SCH_TimeoutID tx_timeout_id; /* Timeout ID for next transmission */
int tx_suspended; /* Boolean indicating we can't transmit yet */
int auto_burst; /* If 1, initiate a burst on each poll */
int auto_offline; /* If 1, automatically go offline if server/peer
isn't responding */
@@ -236,6 +237,10 @@ static ARR_Instance broadcasts;
#define IBURST_GOOD_SAMPLES 4
#define IBURST_TOTAL_SAMPLES SOURCE_REACH_BITS
/* Number of samples in automatic burst */
#define BURST_GOOD_SAMPLES 1
#define MAX_BURST_TOTAL_SAMPLES 4
/* Time to wait after sending packet to 'warm up' link */
#define WARM_UP_DELAY 2.0
@@ -557,6 +562,7 @@ NCR_GetInstance(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourcePar
result->max_delay_ratio = CLAMP(0.0, params->max_delay_ratio, MAX_MAXDELAYRATIO);
result->max_delay_dev_ratio = CLAMP(0.0, params->max_delay_dev_ratio, MAX_MAXDELAYDEVRATIO);
result->offset_correction = params->offset;
result->auto_burst = params->burst;
result->auto_offline = params->auto_offline;
result->poll_target = params->poll_target;
@@ -1121,6 +1127,14 @@ transmit_timeout(void *arg)
if (inst->burst_total_samples_to_go <= 0)
take_offline(inst);
break;
case MD_ONLINE:
/* Start a new burst if the burst option is enabled and the average
polling interval including the burst will not fall below the
minimum polling interval */
if (inst->auto_burst && inst->local_poll > inst->minpoll && inst->local_poll > 1)
NCR_InitiateSampleBurst(inst, BURST_GOOD_SAMPLES,
MIN(1 << (inst->local_poll - inst->minpoll),
MAX_BURST_TOTAL_SAMPLES));
default:
break;
}