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Date: Tue, 1 May 2007 23:10:38 +0200 (CEST)
From: Martin Dieringer <martin.dieringer@gmx.de>
To: Clayton Milos <clay@milos.co.za>
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Cc: freebsd-stable@freebsd.org
Subject: Re: clock too slow - big time offset with ntpdate
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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.

This is quite serious ;-) not to mention the energy waste.

m.