[ntp:questions] How do I prevent sudden system time jumps.

Harlan Stenn stenn at ntp.org
Fri Jul 15 03:42:04 UTC 2011


> The following is an example from ntpd.log
> 
> 14 Apr 07:22:25 ntpd[1048]: synchronized to 10.0.0.5, stratum 1
> 14 Apr 07:22:25 ntpd[1048]: time reset +0.231004 s
> 14 Apr 07:23:35 ntpd[1048]: synchronized to 10.0.0.5, stratum 1
> 14 Apr 07:39:33 ntpd[1048]: time reset +0.318457 s
> 14 Apr 07:39:33 ntpd[1048]: kernel time sync disabled 0041

Forward jumps are unpleasant, but at least they are monotonic.

The trick is to figure out why.

What value is in your ntp.drift file?

Have you seen:

 http://support.ntp.org/bin/view/Support/TroubleshootingNTP

including the "Known Hardware Issues" and "Known Operating System
Issues" pages there?

H



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