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    SubjectRe: big picture UDP/IP performance question re 2.6.18 -> 2.6.32
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    On Tue, 2011-10-04 at 14:16 -0500, Christoph Lameter wrote:
    > On Mon, 3 Oct 2011, starlight@binnacle.cx wrote:
    > > I've come to the conclusion that Eric is right
    > > and the primary issue is an increase in the
    > > cost of scheduler context switches. Have
    > > been watching this number and it has held
    > > pretty close to 200k/sec under all scenarios
    > > and kernel versions, so it has to be
    > > a longer code-path, bigger cache pressure
    > > or both in the scheduler. Sadly this makes
    > > newer kernels a no-go for us.
    > We had similar experiences. Basically latency constantly gets screwed up
    > by the new fancy features being added to the scheduler and network
    > subsystem (most notorious is the new "fair" scheduler, 2.6.23 made a big
    > step down).

    Idly curious, have you compared bfs performance?
    http://ck.kolivas.org/patches/bfs/bfs-faq.txt




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