How to adjust clock frequency in FreeBSD 10.1 ?

Adam Vande More amvandemore at
Thu Feb 12 05:36:25 UTC 2015

On Wed, Feb 11, 2015 at 9:09 PM, Rick Thomas <rbthomas at> wrote:

> Hi All,
> I’ve got a machine with a really bad clock.  When I run NTP on it, the
> freq goes straight to 500.0 (over a period of a few days) and stays there,
> while the offset grows and grows.
> I recently switched this machine from Debian Linux to FreeBSD (wanting to
> learn more about FreeBSD).  Under Linux, I used adjtimex to modify the TICK
> value and (once I had converged on the right value) NTP was able to
> stabilize the clock.
> Is there an equivalent hack for FreeBSD?

You may wish to play around w/

sysctl kern.timecounter

to find a setting that works for you.


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