Re: Very poor performance with 2.6.4
From: Andrew Morton
Date: Sun Mar 28 2004 - 23:07:59 EST
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
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