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    SubjectRe: Phoronix CFS vs BFS bencharks
    On Mon, Sep 14, 2009 at 09:14:35PM +0200, Marcin Letyns wrote:
    > 2009/9/14 Mike Galbraith <efault@gmx.de>
    > >
    > > On Mon, 2009-09-14 at 16:27 +0200, Marcin Letyns wrote:
    > > > Hello,
    > > >
    > > > Disabling NEW_FAIR_SLEEPERS makes a lot of difference here in the
    > > > Apache benchmark:
    > > >
    > > > 2.6.30.6-bfs: 7311.05
    > > >
    > > > 2.6.30.6-cfs-fair_sl_disabled: 8249.17
    > > >
    > > > 2.6.30.6-cfs-fair_sl_enabled: 4894.99
    > >
    > > Wow.
    > >
    > > Some loads like wakeup preemption (mysql+oltp), and some hate it.  This
    > > load appears to REALLY hate it (as does volanomark, but that thing is
    > > extremely overloaded).  How many threads does that benchmark run
    > > concurrently?
    >
    > >From the benchmark description:
    >
    > This is a test of ab, which is the Apache Benchmark program. This test
    > profile measures how many requests per second a given system can
    > sustain when carrying out 500,000 requests with 100 requests being
    > carried out concurrently.

    Be careful not to run ab on the same machine as you run apache, otherwise
    the numerous apache processes can limit ab's throughput. This is the same
    reason as why I educate people so that they don't run a single-process
    proxy in front of a multi-process/multi-thread web server. Apparently
    it's not obvious to everyone.

    Regards,
    Willy

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