Re: Howto switch system/CPU states?

[Dominik Brodowski <linux-JhLEnvuH02M@public.gmane.org>]

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


-------------------------------------------------------
This sf.net email is sponsored by: See the NEW Palm 
Tungsten T handheld. Power & Color in a compact size!
http://ads.sourceforge.net/cgi-bin/redirect.pl?palm0001en