From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dominik Brodowski <linux-JhLEnvuH02M@public.gmane.org>
Subject: Re: Howto switch system/CPU states?
Date: Tue, 5 Nov 2002 09:35:59 +0100
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To: Chris Howells <chris-NvB7AskkBIqIudiWw5vspbVCufUGDwFn@public.gmane.org>
Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
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On Tue, Nov 05, 2002 at 01:29:01AM +0000, Chris Howells wrote:
> 
> Hi,
> 
> On Monday 04 November 2002 6:57 am, Dominik Brodowski wrote:
> > On Sun, Nov 03, 2002 at 10:02:00PM -0800, Happy Camper wrote:
> > > 2. Switch CPU C states.  When I load the processor module, I get this
> > > in the /var/log/messages :
> > > Nov  3 16:09:25 localhost kernel: ACPI: Processor [CPU] (supports C1 C2
> > > C3, 8 throttling states)
> > > However I cant figure out how to switch these processor states.
> >
> > http://www.brodo.de/english/pub/acpi/proc/processor.html
> 
> In the current ACPI patches (e.g. without the ACPI to cpufreq stuff), does the
> switching CPU states have any actual effect?

Yes, it should. Although you don't know whether it works until you have
tested it. cpufreq only offers a cross-architecture interface, device driver
notification, and timer updates (so that delay() loops are correct and
/proc/cpuinfo shows the right frequency).

	Dominik


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