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    SubjectRe: >10% performance degradation since 2.6.18
    On Fri, 3 Jul 2009 21:54:58 +0200
    Andi Kleen <andi@firstfloor.org> wrote:

    > > That would seem to be a fruitful avenue of
    > > investigation -- whether limiting the cards to a single RX/TX
    > > interrupt would be advantageous, or whether spreading the eight
    > > interrupts out over the CPUs would be advantageous.
    >
    > The kernel should really do the per cpu binding of MSIs by default.

    ... so that you can't do power management on a per socket basis?
    hardly a good idea.

    just need to use a new enough irqbalance and it will spread out the
    interrupts unless your load is low enough to go into low power mode.



    --
    Arjan van de Ven Intel Open Source Technology Centre
    For development, discussion and tips for power savings,
    visit http://www.lesswatts.org


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