Subject: Re: Terrible interactivity with 2.6.0-t9-mm3
From: john stultz <johnstul@us.ibm.com>
To: Andrew Morton <akpm@osdl.org>
Cc: "Ronny V. Vindenes" <s864@ii.uib.no>, lkml <linux-kernel@vger.kernel.org>,
       Dominik Brodowski <linux@brodo.de>
In-Reply-To: <20031117113650.67968a26.akpm@osdl.org>
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	 <20031117113650.67968a26.akpm@osdl.org>
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Date: 17 Nov 2003 11:35:51 -0800
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On Mon, 2003-11-17 at 11:36, Andrew Morton wrote:
> "Ronny V. Vindenes" <s864@ii.uib.no> wrote:
> > I've found that neither linus.patch nor
> > context-switch-accounting-fix.patch is causing the problem, but rather
> > acpi-pm-timer-fixes.patch & acpi-pm-timer.patch
> > 
> > With these applied my cpu (athlon64) is detected as 0.0Mhz, bogomips
> > drops to 50% and anything cpu intensive destroys interactivity. Revert
> > them and performance is back at -mm2 level.
> 
> ah hah.  Thank you!
> 
> Probably the interactivity problems are due to the CPU scheduler thinking
> that the CPU runs at 0Hz.  If we can work out why the PM timer patch has
> broken the CPU clock speed detection then all should be well.

Hrmm. I'll look into this. 

thanks
-john


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