Re: C2/C3 on SMP [Was: Re: 2.6.X not recognizing second CPU]

[Dominik Brodowski <linux@dominikbrodowski.net>]

On Wed, Jun 29, 2005 at 09:40:45AM +0200, Erik Slagter wrote:
> On Tue, 2005-06-28 at 23:29 +0200, Dominik Brodowski wrote:
> > On Tue, Jun 28, 2005 at 01:32:59PM +0200, Erik Slagter wrote:
> > > On Mon, 2005-06-27 at 23:42 +0200, Dominik Brodowski wrote:
> > > > a) Power Management is available on SMP, though support for it is a bit less
> > > >    wide-spread than it is for UP
> > > 
> > > Still no C2/C3 handling :-(
> > 
> > Uh, wasn't there a small, nice patch implementing this in bk-acpi a few 
> > weeks ago?
> > *clicketyclick* Oh yes,
> > http://bugzilla.kernel.org/show_bug.cgi?id=4401
> > states it was merged into bk-acpi-test on 2005-04-22. However, I can't find
> > it in current -mm any more...
> 
> You're probably talking about the amd768 module.

No, I'm not. I'm talking about plain ACPI C-States.

> I could use it, but I
> never got it working correctly, there is no actual power reduction. It
> may have to do with the fast (1000 Hz) 2.6 clock though, making it sleep
> in C2/C3 for only very short intervals. Also the selection for idle
> CPU's seems to be too simple.

The ACPI C-State selection algorithm needs a major overhaul, that's true.

	Dominik
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