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    SubjectRe: voluntary-preempt I0: sluggish feel

    * Ingo Molnar <mingo@elte.hu> wrote:

    > > > Oh, sorry for the noise. It was the NVIDIA driver. The open one works
    > > > much better with the I0 patch.
    > >
    > > i can reproduce this and i dont have the NVIDIA driver. When logging
    > > in over the network then shell output is chunky with a setting of 2
    > > (softirq redirection), shell output is smooth with a value of 1.
    >
    > found the reason: ksoftirqd runs at priority 19 by default and this
    > causes batching and some softirq starvation. Does the sluggishness go
    > away if you do 'renice -10 2' [where '2' is the PID of ksoftirqd]?

    i've uploaded -I1 which does this automatically:

    http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8-rc2-I1

    Ingo
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