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Date: Wed, 2 May 2007 13:30:44 +0200 (CEST)
From: Martin Dieringer <martin.dieringer@gmx.de>
To: Ian Smith <smithi@nimnet.asn.au>
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Cc: Clayton Milos <clay@milos.co.za>, freebsd-stable@freebsd.org,
	Jeremy Chadwick <koitsu@freebsd.org>
Subject: Re: clock too slow - big time offset with ntpdate
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On Wed, 2 May 2007, Ian Smith wrote:

> On Wed, 2 May 2007, Martin Dieringer wrote:
> > On Tue, 1 May 2007, Martin Dieringer wrote:
> >
> > > On Tue, 1 May 2007, Clayton Milos wrote:
> > >
> > >>> Hi,
> > >>>
> > >>> I get about half a second time offsets after 10 seconds, and more
> > >>> than 100s after half an hour or so.
> > >>> I think it has to do with powerd, if I kill that, the time stays correct.
> > >>> It happens both on a Compaq nc4000 and an IBM ThinkPad T42p laptop.
> > >>>
> > >>> Can this be solved?
> > >>> thanks
> > >>> m.
> > >>
> > >> This has got to do with the speed stepping of the CPU to save battery.
> > >> Far as I know there's no fix yet.
> > >>
> > >> Guys is it possible to hack powerd to change a sysctl variable when it
> > >> changes the CPU frequency or isn't it that simple?
> > >
> > >
> > > Another effect of the problem seems to be the intermittent sound
> > > output. Playback is ok when powerd is killed.
> > > When changing freq by sysctl, I still get hickups in sound, so this
> > > would be no solution.
> >
> > the hiccups have reappeared, so they are not related to powerd.
> >
> > I still have 0.5 seconds time offsets after 10 minutes, on the
> > thinkpad, without powerd...
>
> I'm wondering if this might have to do with power_profile's settings of
> hw.acpi.cpu.cx_lowest when moving from AC to battery power?


I don't have these values, are they ACPI?
I switched off ACPI on both machines, but I use APM.


m.