[ntp:questions] Should ntpd be run with highest priority (-N)?

Steve Kostecke kostecke at ntp.org
Wed Sep 14 20:44:05 UTC 2011

On 2011-09-14, Fran <fran.horan at jhuapl.edu> wrote:

> That then made me think about later stages of ntpd processing where
> ntpd has decided to adjust the clock some amount. What if pre-emptions
> happen in that segment of processing, where the adjustment value was
> calculated but not actually applied yet ? Just guessing, but I think
> that could lead to some accuracy reduction due to ntpd being pre-
> empted more often in segments it would rather not be pre-empted in.
> Running high priority would reduce the frequency of ntpd pre-emptions
> and the potential for applying adjustments a little later than
> optimal.
> I'm really just guessing so you all can set me straight if needed.

The best way to find out if you need to use -N is to try it. If it makes
an observable difference then you may well want to use it.

Steve Kostecke <kostecke at ntp.org>
NTP Public Services Project - http://support.ntp.org/

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