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ntp+hwclock: add margin to estimated delay quantiles

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Extend the interval of accepted delays by half of the quantile minimum
step in both directions to make room for floating-point errors in the
quantile calculation and an error that will be intentionally added in
the next commit.
This commit is contained in:
Miroslav Lichvar
2024-11-18 16:18:40 +01:00
parent 77962bb527
commit c92358e041
2 changed files with 5 additions and 3 deletions
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6
hwclock.c
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@@ -199,8 +199,10 @@ HCL_ProcessReadings(HCL_Instance clock, int n_readings, struct timespec tss[][3]
local_prec = LCL_GetSysPrecisionAsQuantum();
low_delay = QNT_GetQuantile(clock->delay_quants, QNT_GetMinK(clock->delay_quants));
high_delay = QNT_GetQuantile(clock->delay_quants, QNT_GetMaxK(clock->delay_quants));
low_delay = QNT_GetQuantile(clock->delay_quants, QNT_GetMinK(clock->delay_quants)) -
QNT_GetMinStep(clock->delay_quants) / 2.0;
high_delay = QNT_GetQuantile(clock->delay_quants, QNT_GetMaxK(clock->delay_quants)) +
QNT_GetMinStep(clock->delay_quants) / 2.0;
low_delay = MIN(low_delay, high_delay);
high_delay = MAX(high_delay, low_delay + local_prec);

2
ntp_core.c
View File

@@ -1742,7 +1742,7 @@ check_delay_quant(NCR_Instance inst, double delay)
quant = QNT_GetQuantile(inst->delay_quant, QNT_GetMinK(inst->delay_quant));
if (delay <= quant)
if (delay <= quant + QNT_GetMinStep(inst->delay_quant) / 2.0)
return 1;
DEBUG_LOG("maxdelayquant: delay=%e quant=%e", delay, quant);