ntpd struggling to keep up - how to fix?

Peter Jeremy peterjeremy at acm.org
Tue Feb 23 09:19:55 UTC 2010


On 2010-Feb-22 03:41:05 -0800, Jeremy Chadwick <freebsd at jdc.parodius.com> wrote:
>ntpd under normal operation (not +/- 500ppm) "figure out" on its own the
>average amount of drift, which is what ntpd.drift is for, correct?

Yes.  It takes a long time for ntpd to characterise the local system
clock.  Once it does so, it stores the calculated drift in ntp.drift
and updates it every hour or so.  This means that when ntpd is
restarted, it can immediately set its PLL to a reasonably close value,
rather than starting from scratch.

-- 
Peter Jeremy
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