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ntp: send two presend packets in interleaved mode

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In a burst of three requests (two presend + one normal) the server can
detect the client is using the interleaved mode and save the transmit
timestamp of the second response for the third response. This shortens
the interval in which the server has to keep the state.
This commit is contained in:
Miroslav Lichvar
2016-11-23 16:34:53 +01:00
parent d23c647e34
commit 2b3d64c31d
2 changed files with 10 additions and 9 deletions
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12
ntp_core.c
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@@ -1050,16 +1050,14 @@ transmit_timeout(void *arg)
/* Check whether we need to 'warm up' the link to the other end by
sending an NTP exchange to ensure both ends' ARP caches are
primed. On loaded systems this might also help ensure that bits
of the program are paged in properly before we start. */
primed or whether we need to send two packets first to ensure a
server in the interleaved mode has a fresh timestamp for us. */
if ((inst->presend_minpoll > 0) &&
(inst->presend_minpoll <= inst->local_poll) &&
!inst->presend_done) {
inst->presend_done = 1;
} else {
/* Reset for next time */
inst->presend_done = 0;
inst->presend_done = inst->interleaved ? 2 : 1;
} else if (inst->presend_done > 0) {
inst->presend_done--;
}
sent = transmit_packet(inst->mode, inst->interleaved, inst->local_poll,