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Limit skew used in NTP test4

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With iburst and very jittery sources the source skew can reach very high
values which makes the NTP test4 fail even with relatively small delays.
Limit the skew to 2000 ppm to avoid getting state where a source is unable
to accept more than first three iburst samples.
This commit is contained in:
Miroslav Lichvar 2011-08-12 14:49:23 +02:00
parent 411f4da340
commit e0c9ed44f9
1 changed files with 8 additions and 0 deletions
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8
sourcestats.c
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@ -528,6 +528,14 @@ SST_GetFrequencyRange(SST_Stats inst,
skew = inst->skew;
*lo = freq - skew;
*hi = freq + skew;
/* This function is currently used only to determine the values of delta
and epsilon in the ntp_core module. Limit the skew to a reasonable maximum
to avoid failing the dispersion test too easily. */
if (skew > WORST_CASE_FREQ_BOUND) {
*lo = -WORST_CASE_FREQ_BOUND;
*hi = WORST_CASE_FREQ_BOUND;
}
}
/* ================================================== */