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    SubjectRe: [git pull] scheduler changes for v2.6.26

    * Mike Galbraith <> wrote:

    > > the 700-800 msecs of delays you see are very "brutal" so there must
    > > be something fundamentally wrong going on here.
    > I'm seeing latency hits with 26.git, whereas 25 is hit free.

    ok. I think what happens is that your broken sched-clock hid the real
    breakage. Lets try fix the real breakage now.

    I've uploaded a new sched-devel.git that is against very latest -git,
    could you try ftrace (with a sufficiently large
    /debug/tracing/tracing_max_entries value) - perhaps the
    worst-case-wakeup-latency tracer shows large latencies? If not, then
    maybe the sched_switch tracer gives a better insight into what's

    > Erm, should my Q6600 emit such?

    on nohz it could happen - and fixed in -git. Patch looked too dangerous
    for late-2.6.25 to merge.

    > On 26.git, I get numbers like yours, but with occasional dips down to
    > ~700, though the latency hits don't _seem_ to be synchronous with
    > glitchies.

    hm, the dips shouldnt be happening normally.


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