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Date: Fri, 9 Nov 2001 14:14:15 -0500 (EST)
From: "Calin A. Culianu" <calin@ajvar.org>
To: Joel Jaeggli <joelja@darkwing.uoregon.edu>
Cc: David Grant <davidgrant79@hotmail.com>, <linux-kernel@vger.kernel.org>
Subject: Re: Athlon cooling
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On Thu, 8 Nov 2001, Joel Jaeggli wrote:

> CONFIG_APM_CPU_IDLE
>
> in the apm setup...
>
> clock throttling is a subject of some debate on the linux kernel list... ;)
> but the apm idle call will at least idle the cpu once the idle loop has
> been running for a while.

Yes, and i believe this is done via judicious use of the 'hlt'
instruction.  Also note that on some older K6's there are problems with
this instruction.. namely it halts the machine altogether!

>
> joelja
>
> On Thu, 8 Nov 2001, David Grant wrote:
>
> > There is a program for Windows called CPUIdle, which cools the Athlon
> > tremendoulsy.  I can get my temp. from 52C down to 36C.  It makes the CPU
> > truly go idle.  Is there anything like this for Linux, and I'm wondering if
> > anyone knows the instructions (and/or signals) which could be used to put
> > the Athlon into this state.  I guess it's more of a question for some APM
> > guys, but I thought some people here might know the interface to the Athlon,
> > and might thus know how this software cooling works.  Actually the low-level
> > apm stuff is part of the kernel right?  so maybe this is on-topic.
> >
> > http://www.cpuidle.de/
> >
> > Cheers,
> > David Grant
> > -
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>

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