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local: round log value of clock precision

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This is similar to what the reference NTP implementation does. With 1us
clock resolution that gives -20 instead of -19.
This commit is contained in:
Miroslav Lichvar 2014-06-04 10:48:03 +02:00
parent 3f3ebd3b3b
commit 97ba9e4d47
1 changed files with 5 additions and 1 deletions
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6
local.c
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@ -126,11 +126,15 @@ calculate_sys_precision(void)
assert(best_dusec > 0); assert(best_dusec > 0);
precision_quantum = best_dusec * 1.0e-6; precision_quantum = best_dusec * 1.0e-6;
/* Get rounded log2 value of the measured precision */
precision_log = 0; precision_log = 0;
while (best_dusec < 500000) { while (best_dusec < 707107) {
precision_log--; precision_log--;
best_dusec *= 2; best_dusec *= 2;
} }
DEBUG_LOG(LOGF_Local, "Clock precision %.9f (%d)", precision_quantum, precision_log);
} }
/* ================================================== */ /* ================================================== */