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    SubjectRe: tbench regression on each kernel release from 2.6.22 -> 2.6.28
    On Mon, 11 Aug 2008, David Miller wrote:

    > From: Christoph Lameter <cl@linux-foundation.org>
    > Date: Mon, 11 Aug 2008 13:36:38 -0500
    >
    > > It seems that the network stack becomes slower over time? Here is a list of
    > > tbench results with various kernel versions:
    > >
    > > 2.6.22 3207.77 mb/sec
    > > 2.6.24 3185.66
    > > 2.6.25 2848.83
    > > 2.6.26 2706.09
    > > 2.6.27(rc2) 2571.03
    > >
    > > And linux-next is:
    > >
    > > 2.6.28(l-next) 2568.74
    > >
    > > It shows that there is still have work to be done on linux-next. Too close to
    > > upstream in performance.
    > >
    > > Note the KT event between 2.6.24 and 2.6.25. Why is that?
    >
    > Isn't that when some major scheduler changes went in? I'm not blaming
    > the scheduler, but rather I'm making the point that there are other
    > subsystems in the kernel that the networking interacts with that
    > influences performance at such a low level.

    ...IIRC, somebody in the past did even bisect his (probably netperf)
    2.6.24-25 regression to some scheduler change (obviously it might or might
    not be related to this case of yours)...


    --
    i.


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