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SubjectRe: Reproducible terrible interactivity since 2.5.64bk2
Mike Galbraith wrote:
>
> Greetings potential victims :)
>
> Care to see if the attached cures your woes?
>
> This is a mixture of Ingo's last posted plus the scheduler tuning knobs
> patch (/proc/sys/sched/*). I added three new knobs to watch the effect
> on different loads. max_accel_slices limits the amount of sleep_time
> you may add in one activation. retard_prct_slices is a percentage of a
> slice to deduct from sleep_time each activation (negative feedback for
> heavy context switchers.. dang irman process_load). force_switch is
> there because I'm playing :) I didn't do much to the scheduler itself,
> only made it switch arrays in something closer to a square wave. With
> the settings as in the patch, and running a kernel build, top and irman,
> irman reports worst case response times of 150ms for NULL load, 316ms
> for memory_load, 414 for io_load, and 504ms for process_load.
>
> Anyway, it's attached if you want to play with it ;-)
>
> -Mike
>
> Oh, it's against virgin 2.5.66.


Thanks, running 2.5.66 with the patch applied I could no more reproduce
the problem. I haven't tried playing with the knobs.

Michal

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