[ntp:questions] Re: minpoll and maxpoll
Richard B. Gilbert
rgilbert88 at comcast.net
Mon Dec 20 21:56:29 UTC 2004
Helmut Wollmersdorfer wrote:
> Richard B. Gilbert wrote:
>> You should not specify either minpoll or maxpoll without very good
>> reason! Minpoll defaults to 6 and maxpoll to 10 giving a range from
>> 64 seconds to 1024 seconds. The daemon will adjust the polling
>> interval within this range as needed. The longer polling intervals
>> are needed to let the code "fine tune" your clock.
> Thanks. Now I understand, that shorter is not better.
> Maybe using minpoll and maxpoll was the reason for large offset drifts
> after restart up to 90 ms, than back into opposite direction around
> -50 ms? Never watched this before after a /etc/init.d/ntp-server restart.
> Helmut Wollmersdorfer
Do you define a driftfile in your ntp.conf? You need one to give your
local clock a reasonable starting value for frequency correction. If
you are restarting after having powered down for long enough to make a
significant change in system temperature, you may need several hours
before your clock stabilizes.
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