[ntp:questions] Can a clock drift be too big for ntpd?
hal-usenet at ip-64-139-1-69.sjc.megapath.net
Fri Oct 19 02:26:07 UTC 2007
>It seems as if ntpd can't keep its clock syncronized. It's
>drifting about 6-10 minutes per day, well over the 500 ppm limit.
>After reading some of the posts on this newsgroup, I have come
>to realize that debugging ntp problems can be quite complex.
>Before I launch into a detailed search, I would like to clarify
>one question. Is it possible for the clock frequency to be so
>far off that ntpd just can't get it under control?
6 min per day is 4000 ppm. NTP can't handle more than 500 ppm.
>So, does this look like a hardware problem?
It's a problem. It may not be hardware.
Do you have any other similar machines?
Are you missing interrupts? (say because some strange IO
device eats up a lot of CPU processing its interrupts)
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