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hwclock: Reduce drift factor update period 

To facilitate the calculation of 'cold' vs 'warm' Hardware Clock drift
factor the limit on the update period needs to be less than 8 hours.

4 hours should be enough drift to allow calculations that are not
grossly out of range.

For example, with a workstation that is shutdown every night the cold
drift factor can be significantly different than a drift factor based on
a 24 hour period.

Signed-off-by: J William Piggott <elseifthen@gmx.com>
This commit is contained in:
J William Piggott 2014-10-20 15:22:24 -04:00
parent 66af1c0f44
commit bbb4c273e9
1 changed files with 2 additions and 2 deletions
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4
sys-utils/hwclock.c
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@ -1015,10 +1015,10 @@ adjust_drift_factor(struct adjtime *adjtime_p,
"calibration time is zero,\n"
"so history is bad and calibration startover "
"is necessary.\n"));
} else if ((hclocktime.tv_sec - adjtime_p->last_calib_time) < 24 * 60 * 60) {
} else if ((hclocktime.tv_sec - adjtime_p->last_calib_time) < 4 * 60 * 60) {
if (debug)
printf(_("Not adjusting drift factor because it has "
"been less than a day since the last "
"been less than four hours since the last "
"calibration.\n"));
} else if (adjtime_p->last_calib_time != 0) {
/*