linux-kernel - Re: Network slowdown due to CFS

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Date:	Wed, 3 Oct 2007 12:58:26 +0200
From:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
To:	"Jarek Poplawski" <jarkao2@...pl>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"David Schwartz" <davids@...master.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Network slowdown due to CFS

On 03/10/2007, Dmitry Adamushko <dmitry.adamushko@...il.com> wrote:
> On 03/10/2007, Jarek Poplawski <jarkao2@...pl> wrote:
> > I can't see anything about clearing. I think, this was about charging,
> > which should change the key enough, to move a task to, maybe, a better
> > place in a que (tree) than with current ways.
>
> just a quick patch, not tested and I've not evaluated all possible
> implications yet.
> But someone might give it a try with his/(her -- are even more
> welcomed :-) favourite sched_yield() load.
>
> (and white space damaged)
>
> --- sched_fair-old.c    2007-10-03 12:45:17.010306000 +0200
> +++ sched_fair.c        2007-10-03 12:44:46.899851000 +0200
> @@ -803,7 +803,35 @@ static void yield_task_fair(struct rq *r
>                 update_curr(cfs_rq);
>
>                 return;
> +       } else if (sysctl_sched_compat_yield == 2) {
> +               unsigned long ideal_runtime, delta_exec,
> +                             delta_exec_weighted;
> +
> +               __update_rq_clock(rq);
> +               /*
> +                * Update run-time statistics of the 'current'.
> +                */
> +               update_curr(cfs_rq);
> +
> +               /*
> +                * Emulate (speed up) the effect of us being preempted
> +                * by scheduler_tick().
> +                */
> +               ideal_runtime = sched_slice(cfs_rq, curr);
> +               delta_exec = curr->sum_exec_runtime -
> curr->prev_sum_exec_runtime;
> +
> +               if (ideal_runtime > delta_exec) {
> +                       delta_exec_weighted = ideal_runtime - delta_exec;
> +
> +                       if (unlikely(curr->load.weight != NICE_0_LOAD)) {
> +                               delta_exec_weighted =
> calc_delta_fair(delta_exec_weighted,
> +
>  &se->load);
> +                       }


s/curr/se


-- 
Best regards,
Dmitry Adamushko
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