Date: Sat, 14 Feb 2015 03:42:22 -0800 From: Rick Thomas <rbthomas@pobox.com> To: Adam Vande More <amvandemore@gmail.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: How to adjust clock frequency in FreeBSD 10.1 ? Message-ID: <BF8DFE66-E19D-45DA-A0C3-EB08D7E9DFF9@pobox.com> In-Reply-To: <CA%2BtpaK3bn-UPrqTU9cME2V9Ls=auf1n0rdr%2BuHA1b7pcspmiPw@mail.gmail.com> References: <AE5A370C-A7F7-41D2-900D-B26521A2D705@pobox.com> <CA%2BtpaK3bn-UPrqTU9cME2V9Ls=auf1n0rdr%2BuHA1b7pcspmiPw@mail.gmail.com>
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On Feb 11, 2015, at 9:36 PM, Adam Vande More <amvandemore@gmail.com> =
wrote:
> On Wed, Feb 11, 2015 at 9:09 PM, Rick Thomas <rbthomas@pobox.com> =
wrote:
>=20
>> Hi All,
>>=20
>> I=92ve 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.
>>=20
>> 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.
>>=20
>> Is there an equivalent hack for FreeBSD?
>>=20
>=20
> You may wish to play around w/
>=20
> sysctl kern.timecounter
>=20
> to find a setting that works for you.
When I try to change the frequency with (e.g.)
sysctl kern.timecounter.tc.timebase.frequency=3D36000000
I get
sysctl: oid =91kern.timecounter.tc.timebase.frequency' is read only
Is there some other way to set the frequency?
Thanks!
Rick=
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