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    SubjectRe: [Bug #11308] tbench regression on each kernel release from 2.6.22 -> 2.6.28

    * Christoph Lameter <cl@linux-foundation.org> wrote:

    > On Mon, 17 Nov 2008, Ingo Molnar wrote:
    >
    > > Christoph, as per the recent analysis of Mike:
    > >
    > > http://fixunix.com/kernel/556867-regression-benchmark-throughput-loss-a622cf6-f7160c7-pull.html
    > >
    > > all scheduler components of this regression have been eliminated.
    > >
    > > In fact his numbers show that scheduler speedups since 2.6.22 have
    > > offset and hidden most other sources of tbench regression. (i.e. the
    > > scheduler portion got 5% faster, hence it was able to offset a
    > > slowdown of 5% in other areas of the kernel that tbench triggers)
    >
    > Ok will rerun the tests tomorrow. Just got back from SC08 need some
    > time to catch up.
    >
    > Looks like a lot of work was done on this issue. Thanks!

    You might also want to try net-next:

    [remote "net-next"]
    url = git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6.git
    fetch = +refs/heads/*:refs/remotes/net-next/*

    Some good stuff is in there too, impacting this workload.

    Ingo


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