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    SubjectRe: 2.6.1 slower than 2.4, smp/scsi/sw-raid/reiserfs
    Philip Martin <> wrote:
    > The machine is a dual P3 450MHz, 512MB, aic7xxx, 2 disk RAID-0 and
    > ReiserFS. It's a few years old and has always run Linux, most
    > recently 2.4.24. I decided to try 2.6.1 and the performance is
    > disappointing.

    2.6 has a few performance problems under heavy pageout at present. Nick
    Piggin has some patches which largely fix it up.

    > My test is a software build of about 200 source files (written in C)
    > that I usually build using "nice make -j4".

    Tried -j3?

    > Timing the build on
    > 2.4.24 I typically get something like
    > 242.27user 81.06system 2:44.18elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
    > 0inputs+0outputs (1742270major+1942279minor)pagefaults 0swaps
    > and on 2.6.1 I get
    > 244.08user 116.33system 3:27.40elapsed 173%CPU (0avgtext+0avgdata 0maxresident)k
    > 0inputs+0outputs (0major+3763670minor)pagefaults 0swaps

    hm, the major fault accounting is wrong.

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