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Date: Sat, 19 May 2007 02:01:39 +0100
From: Thomas Hurst <tom.hurst@clara.net>
To: freebsd-amd64@freebsd.org
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Subject: Re: cpufreq/powerd workaround?
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* Uwe Laverenz (uwe@laverenz.de) wrote:

> I just learned the hard way, that the use of cpufreq and powerd
> freezes AMD64/SMP systems almost immediately. I found some old PRs
> that describe this behaviour: amd64/87305, amd64/87689. The age of
> these PRs make me think this issue is not going to be solved in the
> near future. :)
> 
> Is there a workaround for this or another way of saving energy?
> 
> The system I use is a Tyan S2875 board with 2 Opteron 250.

Aside from the occasional warning in dmesg from a failure in setting the
frequency, cpufreq works for me on a Tyan S2895 with 2 Opteron 275's,
and for the past year or so with 2 Opteron 246's:

dev.cpu.0.freq: 1000
dev.cpu.0.freq_levels: 2200/95000 2000/90300 1800/75900 1000/36100
dev.powernow.0.%desc: Cool`n'Quiet K8
dev.powernow.0.%driver: powernow
dev.powernow.0.%parent: cpu0

root      93137  0.0  0.0  3616  1128  ??  Ss   22Apr07  10:15.66 /usr/sbin/powerd

Are you running an up-to-date BIOS?  Any ACPI throttling stuff
configured as well?

-- 
Thomas 'Freaky' Hurst
    http://hur.st/