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reference: rework makestep

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Rework makestep to cancel accumulated offset and step with the new
offset instead of accumulating new offset first, canceling all
accumulated offset and making the step.

This avoids two large frequency changes to initiate and cancel a slew
before making the step.
This commit is contained in:
Miroslav Lichvar
2014-06-05 14:46:22 +02:00
parent 64ba5a5b65
commit 20d2363fb7
4 changed files with 28 additions and 19 deletions
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9
local.c
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@@ -563,10 +563,10 @@ lcl_RegisterSystemDrivers(lcl_ReadFrequencyDriver read_freq,
/* ================================================== */
/* Look at the current difference between the system time and the NTP
time, and make a step to cancel it if it's larger than the threshold. */
time, and make a step to cancel it. */
int
LCL_MakeStep(double threshold)
LCL_MakeStep(void)
{
struct timeval raw;
double correction;
@@ -574,14 +574,11 @@ LCL_MakeStep(double threshold)
LCL_ReadRawTime(&raw);
LCL_GetOffsetCorrection(&raw, &correction, NULL);
if (fabs(correction) <= threshold)
return 0;
/* Cancel remaining slew and make the step */
LCL_AccumulateOffset(correction, 0.0);
LCL_ApplyStepOffset(-correction);
LOG(LOGS_WARN, LOGF_Local, "System clock was stepped by %.3f seconds", correction);
LOG(LOGS_WARN, LOGF_Local, "System clock was stepped by %.6f seconds", correction);
return 1;
}