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    SubjectRe: PERF: performance tests with the split LRU VM in -mm
    On Tue, 29 Jul 2008 22:04:16 +0900
    KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:

    > > TEST 1: dd if=/dev/sda of=/dev/null bs=1M
    > >
    > > kernel speed swap used
    > >
    > > 2.6.26 111MB/s 500kB
    > > -mm 110MB/s 59MB (ouch, system noticably slower)
    > > noforce 111MB/s 128kB
    > > stream 108MB/s 0 (slight regression, not sure why yet)
    >
    > I tried to reproduce it, my ia64 result was
    >
    > kernel speed swap used
    > 2.6.26-rc8 49.8MB/s 1M
    > 2.6.26-rc8-mm1 47.6MB/s 168M
    > -mm with above two patch 50.2MB/s 0
    >
    >
    > So, I think it isn't regression.

    Agreed. It looked like it, but once I changed the cpuspeed
    governor from ondemand to performance, I saw that it had to
    be an artifact of something else.

    Getting rid of the swap use from a linear IO is the important
    part.

    --
    All rights reversed.


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