[ntp:questions] Re: synchronisation lost problem
michael.no.spam.cook at wanadoo.fr
Sun Dec 12 16:02:40 UTC 2004
Did you find the cause of the problem?? I did not see any resolution in
Your problem is almost certainly not with ntp, but the clock disciplin.
ntpd seem to be reporting varied drift rate changes. There is an additional
1.812 ppm in the first hour after the first reset
0.86 ppm in the second
38.776 ppm in the third
Those are widely differing for a machine in a stable temperature
environement as you indicate. My machine which is an unregulated
environement doesn't change more than 0.2ppm in the same period.
So either your hardware clock is broken, or, if you have already
changed it (and it was not DOA) then the /etc/adjtime value is
reporting data from the previous broken hardware which will induce error
in the clock adjustments.
Try removing it and rebooting the machine.
If that has already been done, try graphing the clock drift to see if
there is a pattern you can relate to other events. It would probably be
a good idea to to graph the drift while not syncing with external
machines (or at least measuring drift with ntp stopped for a while) to
eliminate ntp as a source.
Also check that the selected ntp server is not flip flopping between
the two you have. Having just two defined servers is the worst possible
Serge Tchesmeli wrote:
> 6 Dec 13:56:47 ntpd: time reset 0.142454 s
> 6 Dec 14:38:22 ntpd: offset 0.022124 sec freq 178.812 ppm error
> 0.027763 poll 9
> 6 Dec 15:38:23 ntpd: offset 0.017784 sec freq 180.624 ppm error
> 0.028154 poll 10
> 6 Dec 16:38:23 ntpd: offset 0.113686 sec freq 181.484 ppm error
> 0.046980 poll 10
> 6 Dec 17:11:15 ntpd: time reset 0.184771 s
> 6 Dec 17:11:15 ntpd: synchronisation lost
> 6 Dec 17:38:24 ntpd: offset 0.051767 sec freq 220.260 ppm error
> 0.040462 poll 8
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