linux-kernel - Re: (ondemand) CPU governor regression between 2.6.23 and 2.6.24

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Message-Id: <20080203163255.467256d4.akpm@linux-foundation.org>
Date:	Sun, 3 Feb 2008 16:32:55 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	linux-kernel@...r.kernel.org, cpufreq@....linux.org.uk
Subject: Re: (ondemand) CPU governor  regression between 2.6.23 and 2.6.24

On Sat, 26 Jan 2008 15:06:25 +0100 Toralf Förster <toralf.foerster@....de> wrote:

> I use a 1-liner for a simple performance check : "time factor 819734028463158891"
> Here is the result for the new (Gentoo) kernel 2.6.24:
> 
> With the  ondemand governor of the  I get:
> 
> tfoerste@n22 ~/tmp $ time factor 819734028463158891
> 819734028463158891: 3 273244676154386297
> 
> real    0m32.997s
> user    0m15.732s
> sys     0m0.014s
> 
> With the ondemand governor the CPU runs at 600 MHz,
> whereas with the performance governor I get :
> 
> tfoerste@n22 ~/tmp $ time factor 819734028463158891
> 819734028463158891: 3 273244676154386297
> 
> real    0m10.893s
> user    0m5.444s
> sys     0m0.000s
> 
> (~5.5 sec as I expected) b/c the CPU is set to 1.7 GHz.
> 
> The ondeman governor of previous kernel versions however automatically increased
> the CPU speed from 600 MHz to 1.7 GHz.
> 
> My system is a ThinkPad T41, I'll attach the .config 
> 

Let's cc the cpufreq list.

If nothing happens (often the case), please raise a report at
bugzilla.kernel.org so we can track the presence of the regression.

Thanks.

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