Re: Very poor performance with 2.6.4

[Andrew Morton]

Andreas Hartmann <andihartmann@xxxxxxxxxx> 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.
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