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    SubjectRe: Very poor performance with 2.6.4
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    On Mon, 2004-03-29 at 01:16, Andreas Hartmann wrote:
    > Andrew Morton wrote:
    > > 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.
    >
    > This didn't help.
    >
    > >
    > > If that doesn't help, please run a comparative kernel profile. See
    > > Documentation/basic_profiling.txt.
    >
    > I'll do this next.

    You might also want to try 2.6.5-rc2 which has a set of reiserfs fixes
    from 2.4.x. I'm hoping those will clean things up for you.

    2.6.5-rc2-mm3 and higher have a number of other reiserfs performance
    fixes, but most of those were not in 2.4. Trying them out will
    complicate the picture (although I'm still interested in numbers from
    -mm).

    -chris


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