Date: Fri, 2 Apr 2004 02:23:48 -0800
From: Andrew Morton <akpm@osdl.org>
To: Andreas Hartmann <andihartmann@freenet.de>
Cc: mason@suse.com, linux-kernel@vger.kernel.org
Subject: Re: Very poor performance with 2.6.4
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Andreas Hartmann <andihartmann@freenet.de> wrote:
>
> Now, I tested 2.6.5-rc3-mm4. Same procedure.
>  The good news first:
>  2.6.5-rc3-mm4 is nearly as fast as 2.4.25 - it is about 2% slower than 
>  2.4.25 (with preemption turned on).
> 
>  Now the bad news:
>  The system-processor-time is unchanged abnormal high: it is 34% (!) higher 
>  than in 2.4.25 (and about 1% more than in 2.4.6).
> 
> 
>  Btw: Did the other profile outputs help to find the problem?
> 
>  These are the profile-values for an example run (make of kernel 2.6.5rc2) 
>  with 2.6.5rc3mm4:

Spending a lot of time on do_softirq() while compiling stuff is peculiar.

What device drivers are running at the time?  disk/network/usb/etc?
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