linux-kernel - Re: Network slowdown due to CFS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <b647ffbd0710030358m3b107176n5f52e7b7846ef1d8@mail.gmail.com>
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/