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sources: allow selection of unreachable sources

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Reachability is no longer a requirement for selection. An unreachable
source can remain selected if its newest sample is not older than the
oldest sample from all reachable sources.

This is useful to prevent reselection when an accurate source uses a
very short polling interval (e.g. refclock) and is occasionally
unreachable for short periods of time.
This commit is contained in:
Miroslav Lichvar
2014-10-17 16:51:45 +02:00
parent 0f8368bcf1
commit 8f06245428
3 changed files with 60 additions and 20 deletions
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20
sourcestats.c
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@@ -520,11 +520,19 @@ SST_GetSelectionData(SST_Stats inst, struct timeval *now,
double *offset_lo_limit,
double *offset_hi_limit,
double *root_distance,
double *variance, int *select_ok)
double *variance,
double *first_sample_ago,
double *last_sample_ago,
int *select_ok)
{
double offset, sample_elapsed;
int i, j;
if (!inst->n_samples) {
*select_ok = 0;
return;
}
i = get_runsbuf_index(inst, inst->best_single_sample);
j = get_buf_index(inst, inst->best_single_sample);
@@ -553,10 +561,16 @@ SST_GetSelectionData(SST_Stats inst, struct timeval *now,
}
#endif
i = get_runsbuf_index(inst, 0);
UTI_DiffTimevalsToDouble(first_sample_ago, now, &inst->sample_times[i]);
i = get_runsbuf_index(inst, inst->n_samples - 1);
UTI_DiffTimevalsToDouble(last_sample_ago, now, &inst->sample_times[i]);
*select_ok = inst->regression_ok;
DEBUG_LOG(LOGF_SourceStats, "n=%d off=%f dist=%f var=%f selok=%d",
inst->n_samples, offset, *root_distance, *variance, *select_ok);
DEBUG_LOG(LOGF_SourceStats, "n=%d off=%f dist=%f var=%f first_ago=%f last_ago=%f selok=%d",
inst->n_samples, offset, *root_distance, *variance,
*first_sample_ago, *last_sample_ago, *select_ok);
}
/* ================================================== */