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From: Andrew Morton <akpm@osdl.org>
To: Andreas Hartmann <andihartmann@freenet.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Very poor performance with 2.6.4
Date: Sun, 28 Mar 2004 20:07:10 -0800	[thread overview]
Message-ID: <20040328200710.66a4ae1a.akpm@osdl.org> (raw)
In-Reply-To: <40672F39.5040702@p3EE062D5.dip0.t-ipconnect.de>

Andreas Hartmann <andihartmann@freenet.de> wrote:
>
> I tested kernel 2.6.4. While compiling kdelibs and kdebase, I felt, that
>  kernel 2.6 seems to be slower than 2.4.25.
> 
>  So I did some tests to compare the performance directly. Therefore I
>  rebooted for everey test in init 2 (no X).
> 
>  I locally compiled 2.6.5rc2 3 times under 2.6.4 and under 2.4.25 on a
>  reiserfs LVM partition, which resides onto a IDE HD (using DMA) and got
>  the following result:
> 
>  In the middle, compiling under kernel 2.6.4 tooks 9.3% more real time than
>  under 2.4.25.
>  The user-processortime is about the same, but the system-processortime is
>  under 2.6.4 32.9% higher than under 2.4.25.

Try mounting your reiserfs filesystems with the `-o nolargeio=1' option.

If that doesn't help, please run a comparative kernel profile.  See
Documentation/basic_profiling.txt.

Thanks.

  parent reply	other threads:[~2004-03-29  4:07 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-03-28 20:02 Very poor performance with 2.6.4 Andreas Hartmann
2004-03-28 20:24 ` Matt H.
2004-03-28 21:11 ` Sasa U
2004-03-29  4:07 ` Andrew Morton [this message]
2004-03-29  6:16   ` Andreas Hartmann
2004-03-29 14:23     ` Chris Mason
2004-03-29 19:35       ` Andreas Hartmann
2004-03-29 19:42       ` Andreas Hartmann
2004-04-02  8:19       ` Andreas Hartmann
2004-04-02 10:23         ` Andrew Morton
2004-04-02 20:53           ` Andreas Hartmann
2004-04-02 21:13             ` Andrew Morton
2004-04-03  0:23               ` Andreas Hartmann
2004-03-29 17:41   ` Andreas Hartmann
     [not found] <1EOM0-3oS-17@gated-at.bofh.it>
2004-03-28 22:47 ` Andi Kleen

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