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    SubjectRe: [patch] CFS scheduler, -v7
    Date
    Ingo Molnar wrote:
    > * Ingo Molnar <mingo@elte.hu> wrote:
    > > > [...] but there are still some nice issues.
    > > >
    > > > Try running 3 chew.c's, then renicing one to -10, starves others for
    > > > some seconds while switching prio-level. Now renice it back to 10,
    > > > it starves for up to 45sec.
    > >
    > > ok - to make sure i understood you correctly: does this starvation
    > > only occur right when you renice it (when switching prio levels), and
    > > it gets rectified quickly once they get over a few reschedules?
    >
    > meanwhile i managed to reproduce it by following the exact steps you
    > described, and i've fixed the bug in my tree. Can you confirm that the
    > patch below fixes it for you too?

    Seems like this fixed it. But I can still see these awful latency blips in
    the presence of negatively niced chew.c at -10 and two chew.c's at nice 0.
    This gets really bad when sched_granularity_ns >= 5,000,000.


    Thanks!

    --
    Al

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