From: Wiktor Wodecki <wodecki@gmx.de>
To: Con Kolivas <kernel@kolivas.org>
Cc: Mike Galbraith <efault@gmx.de>,
Nick Piggin <piggin@cyberone.com.au>,
Davide Libenzi <davidel@xmailserver.org>,
linux kernel mailing list <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>,
Zwane Mwaikambo <zwane@arm.linux.org.uk>
Subject: Re: [PATCH] O6int for interactivity
Date: Fri, 18 Jul 2003 13:34:36 +0200 [thread overview]
Message-ID: <20030718113436.GA627@gmx.de> (raw)
In-Reply-To: <200307182043.06029.kernel@kolivas.org>
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On Fri, Jul 18, 2003 at 08:43:05PM +1000, Con Kolivas wrote:
> On Fri, 18 Jul 2003 20:31, Wiktor Wodecki wrote:
> > On Fri, Jul 18, 2003 at 12:18:33PM +0200, Mike Galbraith wrote:
> > > That _might_ (add salt) be priorities of kernel threads dropping too low.
> > >
> > > I'm also seeing occasional total stalls under heavy I/O in the order of
> > > 10-12 seconds (even the disk stops). I have no idea if that's something
> > > in mm or the scheduler changes though, as I've yet to do any isolation
> > > and/or tinkering. All I know at this point is that I haven't seen it in
> > > stock yet.
> >
> > I've seen this too while doing a huge nfs transfer from a 2.6 machine to
> > a 2.4 machine (sparc32). Thought it'd be something with the nfs changes
> > which were recently, might be the scheduler, tho. Ah, and it is fully
> > reproducable.
>
> Well I didn't want to post this yet because I'm not sure if it's a good
> workaround yet but it looks like a reasonable compromise, and since you have a
> testcase it will be interesting to see if it addresses it. It's possible that
> a task is being requeued every millisecond, and this is a little smarter. It
> allows cpu hogs to run for 100ms before being round robinned, but shorter for
> interactive tasks. Can you try this O7 which applies on top of O6.1 please:
>
> available here:
> http://kernel.kolivas.org/2.5
sorry, the problem still persists. Aborting the cp takes less time, tho
(about 10 seconds now, before it was about 30 secs). I'm aborting during
a big file, FYI.
>
> and here:
>
> --- linux-2.6.0-test1-mm1/kernel/sched.c 2003-07-17 19:59:16.000000000 +1000
> +++ linux-2.6.0-testck1/kernel/sched.c 2003-07-18 00:10:55.000000000 +1000
> @@ -1310,10 +1310,12 @@ void scheduler_tick(int user_ticks, int
> enqueue_task(p, rq->expired);
> } else
> enqueue_task(p, rq->active);
> - } else if (p->prio < effective_prio(p)){
> + } else if (!((task_timeslice(p) - p->time_slice) %
> + (MIN_TIMESLICE * (MAX_BONUS + 1 - p->sleep_avg * MAX_BONUS / MAX_SLEEP_AVG)))){
> /*
> - * Tasks that have lowered their priority are put to the end
> - * of the active array with their remaining timeslice
> + * Running tasks get requeued with their remaining timeslice
> + * after a period proportional to how cpu intensive they are to
> + * minimise the duration one interactive task can starve another
> */
> dequeue_task(p, rq->active);
> set_tsk_need_resched(p);
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
--
Regards,
Wiktor Wodecki
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next prev parent reply other threads:[~2003-07-18 11:20 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-16 14:30 [PATCH] O6int for interactivity Con Kolivas
2003-07-16 15:22 ` Felipe Alfaro Solana
2003-07-16 19:55 ` Marc-Christian Petersen
2003-07-16 17:08 ` Valdis.Kletnieks
2003-07-16 21:59 ` Wiktor Wodecki
2003-07-16 22:30 ` Con Kolivas
2003-07-16 22:12 ` Davide Libenzi
2003-07-17 0:33 ` Con Kolivas
2003-07-17 0:35 ` Davide Libenzi
2003-07-17 1:12 ` Con Kolivas
2003-07-17 0:48 ` Wade
2003-07-17 1:15 ` Con Kolivas
2003-07-17 1:27 ` Eugene Teo
2003-07-17 3:05 ` Wes Janzen
2003-07-17 9:05 ` Alex Riesen
2003-07-17 9:14 ` Con Kolivas
2003-07-18 7:38 ` Alex Riesen
[not found] ` <Pine.LNX.4.44.0307251628500.26172-300000@localhost.localdomain>
2003-07-25 19:40 ` Alex Riesen
[not found] ` <Pine.LNX.4.55.0307161241280.4787@bigblue.dev.mcafeelabs.co m>
2003-07-18 5:38 ` Mike Galbraith
2003-07-18 6:34 ` Nick Piggin
2003-07-18 10:18 ` Mike Galbraith
2003-07-18 10:31 ` Wiktor Wodecki
2003-07-18 10:43 ` Con Kolivas
2003-07-18 11:34 ` Wiktor Wodecki [this message]
2003-07-18 11:38 ` Nick Piggin
2003-07-19 10:59 ` Wiktor Wodecki
2003-07-18 15:46 ` Mike Galbraith
2003-07-18 16:52 ` Davide Libenzi
2003-07-18 17:05 ` Davide Libenzi
2003-07-18 17:39 ` Valdis.Kletnieks
2003-07-18 19:31 ` Davide Libenzi
[not found] ` <Pine.LNX.4.55.0307181038450.5608@bigblue.dev.mcafeelabs.co m>
2003-07-18 20:31 ` Mike Galbraith
2003-07-18 20:38 ` Davide Libenzi
[not found] ` <Pine.LNX.4.55.0307181333520.5608@bigblue.dev.mcafeelabs.co m>
2003-07-19 17:04 ` Mike Galbraith
2003-07-21 0:21 ` Davide Libenzi
[not found] ` <Pine.LNX.4.55.0307201715130.3548@bigblue.dev.mcafeelabs.co m>
2003-07-21 5:36 ` Mike Galbraith
2003-07-21 12:39 ` [NOTAPATCH] " Mike Galbraith
2003-07-21 17:13 ` Mike Galbraith
2003-07-18 14:24 ` Con Kolivas
2003-07-18 15:50 ` Mike Galbraith
2003-07-18 13:46 ` Davide Libenzi
[not found] ` <Pine.LNX.4.55.0307180630450.5077@bigblue.dev.mcafeelabs.co m>
2003-07-18 15:41 ` Mike Galbraith
[not found] ` <Pine.LNX.4.55.0307180951050.5608@bigblue.dev.mcafeelabs.co m>
2003-07-18 18:49 ` Mike Galbraith
2003-07-16 20:20 Shane Shrybman
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