[ntp:questions] once 'ntpd' stops, does the drift file value continue to get used for clock adjustments?

Martin Burnicki martin.burnicki at meinberg.de
Fri Mar 18 08:38:51 UTC 2011


David Woolley wrote:

> Gautam Thaker wrote:
>> I have a stable drift value on my fedora 12 node and everything is
>> running well. (offsets are well below 1msec). If I now stop 'ntpd'
>> will my time start to drift relative to the 'correct time' by the PPM
>> value in the drift file? Or is it that ntpd has already set things up
> 
> Depends on whether or not you are using the kernel time discipline.
> Some people set tinker values that cause the kernel discipline to be
> turned off, and it is not supported on all platforms.
> 
> Windows will probably retain the last correction, but this may include a
>   high frequency component.

AFAIK the Windows port of ntpd restores the standard tick value when it
terminates, so the drift compensation isn't in effect anymore thereafter.

Martin
-- 
Martin Burnicki

Meinberg Funkuhren
Bad Pyrmont
Germany




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