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local: make maximum frequency offset configurable

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Add maxdrift directive to set the maximum assumed drift of the clock,
which sets the maximum frequency offset chronyd is allowed to use to
to correct the drift.
This commit is contained in:
Miroslav Lichvar
2016-03-22 17:07:46 +01:00
parent d70e815e9f
commit a12c7c422b
4 changed files with 32 additions and 6 deletions
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16
local.c
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@@ -42,13 +42,12 @@
/* ================================================== */
/* Maximum allowed frequency offset in ppm, the time must not stop
or run backwards */
#define MAX_FREQ 500000.0
/* Variable to store the current frequency, in ppm */
static double current_freq_ppm;
/* Maximum allowed frequency, in ppm */
static double max_freq_ppm;
/* Temperature compensation, in ppm */
static double temp_comp_ppm;
@@ -166,6 +165,11 @@ LCL_Initialise(void)
calculate_sys_precision();
/* This is the maximum allowed frequency offset in ppm, the time must
never stop or run backwards */
max_freq_ppm = CNF_GetMaxDrift();
max_freq_ppm = CLAMP(0.0, max_freq_ppm, 500000.0);
max_clock_error = CNF_GetMaxClockError() * 1e-6;
}
@@ -406,12 +410,12 @@ LCL_ReadAbsoluteFrequency(void)
static double
clamp_freq(double freq)
{
if (freq <= MAX_FREQ && freq >= -MAX_FREQ)
if (freq <= max_freq_ppm && freq >= -max_freq_ppm)
return freq;
LOG(LOGS_WARN, LOGF_Local, "Frequency %.1f ppm exceeds allowed maximum", freq);
return freq >= MAX_FREQ ? MAX_FREQ : -MAX_FREQ;
return CLAMP(-max_freq_ppm, freq, max_freq_ppm);
}
/* ================================================== */