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    SubjectRe: tbench regression on each kernel release from 2.6.22 -> 2.6.28
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    On Mon, 2008-08-11 at 13:36 -0500, Christoph Lameter wrote:
    > 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
    What's the hardware configuration? Is it dual-core?

    I also track tbench performance with lastest kernels on a couple of quad-core machines,
    and didn't find such regression while the results did have fluctuation.

    What's the commandline you is using to start tbench? I start tbench with CPU_NUM*2.

    BTW, I enabled CONFIG_SLUB since 2.6.22.

    >
    > 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?




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