faraphel/chrony
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sources: rework special mode ending with unreachable sources

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Instead of giving up when a source has 7 reach updates, continue as long
as at least one source has fewer than 7 updates and can still have 3
samples to be selectable in that number of updates.

When no sources are responding, it will give up sooner.
This commit is contained in:
Miroslav Lichvar 2014-04-10 15:45:11 +02:00
parent ae104b5c28
commit 3888b9dcec
1 changed files with 22 additions and 3 deletions
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25
sources.c
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@ -45,6 +45,7 @@
#include "nameserv.h"
#include "mkdirpp.h"
#include "sched.h"
#include "regress.h"
/* ================================================== */
/* Flag indicating that we are initialised */
@ -346,6 +347,25 @@ SRC_UnsetSelectable(SRC_Instance inst)
/* ================================================== */
static int
special_mode_end(void)
{
int i;
for (i = 0; i < n_sources; i++) {
/* Don't expect more updates than from an offline iburst NTP source */
if (sources[i]->reachability_size >= SOURCE_REACH_BITS - 1)
continue;
/* Check if the source could still have enough samples to be selectable */
if (SOURCE_REACH_BITS - 1 - sources[i]->reachability_size +
SRC_Samples(sources[i]) >= MIN_SAMPLES_FOR_REGRESS)
return 0;
}
return 1;
}
void
SRC_UpdateReachability(SRC_Instance inst, int reachable)
{
@ -361,9 +381,8 @@ SRC_UpdateReachability(SRC_Instance inst, int reachable)
SRC_SelectSource(NULL);
}
/* End special reference mode on last reachability update from iburst */
if (REF_GetMode() != REF_ModeNormal &&
inst->reachability_size >= SOURCE_REACH_BITS - 1) {
/* Check if special reference update mode failed */
if (REF_GetMode() != REF_ModeNormal && special_mode_end()) {
REF_SetUnsynchronised();
}
}