On May 15, 2008, at 12:53 PM, Volker Jahns wrote:
While you should run ntpdate -b at system boot, running ntpdate
periodically via cron is not the right thing to do-- you should run
ntpd instead, and that will figure out the intrinsic correction your
chosen system clock needs to keep better time via the ntp.drift file.


Running ntpd on this system results in time drift of approx. 1-2 hrs a day. That is not an acceptable option.

Something's probably wrong with your hardware clock or there is something else going on, if it is really drifting at ~ 5% from real time. Sometimes replacing the battery on the motherboard fixes this. Does "vmstat -i" show exceptional interrupt load or anything like that?

You should also take a look at the output of "sysctl
kern.timecounter", and possibly switch to a different mechanism, if
the existing choice doesn't work out well for your machine...
Thanks for the hint.

Indeed, try using one of the other timesources and see whether that corrects the huge offsets you are reporting.

--
-Chuck

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