From: Ingo Molnar <mingo@elte.hu>
To: Con Kolivas <kernel@kolivas.org>
Cc: Mike Galbraith <efault@gmx.de>, Willy Tarreau <willy@w.ods.org>,
lkml <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@osdl.org>,
bugsplatter@gmail.com
Subject: Re: interactive task starvation
Date: Tue, 21 Mar 2006 15:30:42 +0100 [thread overview]
Message-ID: <20060321143042.GA32173@elte.hu> (raw)
In-Reply-To: <200603220128.07550.kernel@kolivas.org>
* Con Kolivas <kernel@kolivas.org> wrote:
> On Wednesday 22 March 2006 01:25, Ingo Molnar wrote:
> > * Con Kolivas <kernel@kolivas.org> wrote:
> > > What you're fixing with unfairness is worth pursuing. The 'ls' issue
> > > just blows my mind though for reasons I've just said. Where are the
> > > magic cycles going when nothing else is running that make it take ten
> > > times longer?
> >
> > i believe such artifacts are due to array switches not happening (due to
> > the workload getting queued back to rq->active, not rq->expired), and
> > 'ls' only gets a timeslice once in a while, every STARVATION_LIMIT
> > times. I.e. such workloads penalize the CPU-bound 'ls' process quite
> > heavily.
>
> With nothing else running on the machine it should still get all the
> cpu no matter which array it's on though.
yes. I thought you were asking why 'ls' pauses so long during the
aforementioned workloads (of loadavg 7-8) - and i answered that. If you
meant something else then please re-explain it to me.
Ingo
next prev parent reply other threads:[~2006-03-21 14:32 UTC|newest]
Thread overview: 148+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-07 23:13 [PATCH] mm: yield during swap prefetching Con Kolivas
2006-03-07 23:13 ` Con Kolivas
2006-03-07 23:26 ` Andrew Morton
2006-03-07 23:26 ` Andrew Morton
2006-03-07 23:32 ` Con Kolivas
2006-03-07 23:32 ` Con Kolivas
2006-03-08 0:05 ` Andrew Morton
2006-03-08 0:05 ` Andrew Morton
2006-03-08 0:51 ` Con Kolivas
2006-03-08 0:51 ` Con Kolivas
2006-03-08 1:11 ` Andrew Morton
2006-03-08 1:11 ` Andrew Morton
2006-03-08 1:12 ` Con Kolivas
2006-03-08 1:12 ` Con Kolivas
2006-03-08 1:19 ` Con Kolivas
2006-03-08 1:19 ` Con Kolivas
2006-03-08 1:23 ` Andrew Morton
2006-03-08 1:23 ` Andrew Morton
2006-03-08 1:28 ` Con Kolivas
2006-03-08 1:28 ` Con Kolivas
2006-03-08 2:08 ` Lee Revell
2006-03-08 2:08 ` Lee Revell
2006-03-08 2:12 ` Con Kolivas
2006-03-08 2:12 ` Con Kolivas
2006-03-08 2:18 ` Lee Revell
2006-03-08 2:18 ` Lee Revell
2006-03-08 2:22 ` Con Kolivas
2006-03-08 2:22 ` Con Kolivas
2006-03-08 2:27 ` Lee Revell
2006-03-08 2:27 ` Lee Revell
2006-03-08 2:30 ` Con Kolivas
2006-03-08 2:30 ` Con Kolivas
2006-03-08 2:52 ` [ck] " André Goddard Rosa
2006-03-08 2:52 ` André Goddard Rosa
2006-03-08 3:03 ` Lee Revell
2006-03-08 3:03 ` Lee Revell
2006-03-08 3:05 ` Con Kolivas
2006-03-08 21:07 ` Zan Lynx
2006-03-08 23:00 ` Con Kolivas
2006-03-08 23:48 ` Zan Lynx
2006-03-09 0:07 ` Con Kolivas
2006-03-09 3:13 ` Zan Lynx
2006-03-09 4:08 ` Con Kolivas
2006-03-09 4:54 ` Lee Revell
2006-03-09 4:54 ` Lee Revell
2006-03-08 7:51 ` Jan Knutar
2006-03-08 7:51 ` Jan Knutar
2006-03-08 8:39 ` Con Kolivas
2006-03-08 8:39 ` Con Kolivas
2006-03-09 8:57 ` Helge Hafting
2006-03-09 8:57 ` Helge Hafting
2006-03-09 9:08 ` Con Kolivas
2006-03-09 9:08 ` Con Kolivas
2006-03-09 22:44 ` Peter Williams
2006-03-10 9:01 ` [ck] " Andreas Mohr
2006-03-10 9:01 ` Andreas Mohr
2006-03-10 9:11 ` Con Kolivas
2006-03-10 9:11 ` Con Kolivas
2006-03-10 0:58 ` Peter Williams
2006-03-08 22:24 ` Pavel Machek
2006-03-08 22:24 ` Pavel Machek
2006-03-09 2:22 ` Nick Piggin
2006-03-09 2:22 ` Nick Piggin
2006-03-09 2:30 ` Con Kolivas
2006-03-09 2:30 ` Con Kolivas
2006-03-09 2:57 ` Nick Piggin
2006-03-09 2:57 ` Nick Piggin
2006-03-09 9:11 ` Con Kolivas
2006-03-09 9:11 ` Con Kolivas
2006-03-08 13:36 ` [ck] " Con Kolivas
2006-03-08 13:36 ` Con Kolivas
2006-03-17 9:06 ` Ingo Molnar
2006-03-17 9:06 ` Ingo Molnar
2006-03-17 10:46 ` interactive task starvation Mike Galbraith
2006-03-17 17:15 ` Mike Galbraith
2006-03-20 7:09 ` Mike Galbraith
2006-03-20 10:22 ` Ingo Molnar
2006-03-21 6:47 ` Willy Tarreau
2006-03-21 7:51 ` Mike Galbraith
2006-03-21 9:13 ` Willy Tarreau
2006-03-21 9:14 ` Ingo Molnar
2006-03-21 11:15 ` Willy Tarreau
2006-03-21 11:18 ` Ingo Molnar
2006-03-21 11:53 ` Con Kolivas
2006-03-21 13:10 ` Mike Galbraith
2006-03-21 13:13 ` Con Kolivas
2006-03-21 13:33 ` Mike Galbraith
2006-03-21 13:37 ` Con Kolivas
2006-03-21 13:44 ` Willy Tarreau
2006-03-21 13:45 ` Con Kolivas
2006-03-21 14:01 ` Mike Galbraith
2006-03-21 14:17 ` Con Kolivas
2006-03-21 15:20 ` Con Kolivas
2006-03-21 17:50 ` Willy Tarreau
2006-03-22 4:18 ` Mike Galbraith
2006-03-21 17:51 ` Mike Galbraith
2006-03-21 13:38 ` Willy Tarreau
2006-03-21 13:48 ` Mike Galbraith
2006-03-21 12:07 ` Mike Galbraith
2006-03-21 12:59 ` Willy Tarreau
2006-03-21 13:24 ` Mike Galbraith
2006-03-21 13:53 ` Con Kolivas
2006-03-21 14:17 ` Mike Galbraith
2006-03-21 14:19 ` Con Kolivas
2006-03-21 14:25 ` Ingo Molnar
2006-03-21 14:28 ` Con Kolivas
2006-03-21 14:30 ` Ingo Molnar [this message]
2006-03-21 14:28 ` Mike Galbraith
2006-03-21 14:30 ` Con Kolivas
2006-03-21 14:32 ` Ingo Molnar
2006-03-21 14:44 ` Willy Tarreau
2006-03-21 14:52 ` Ingo Molnar
2006-03-29 3:01 ` Lee Revell
2006-03-29 5:56 ` Ray Lee
2006-03-29 6:16 ` Lee Revell
2006-03-21 14:36 ` Mike Galbraith
2006-03-21 14:39 ` Con Kolivas
2006-03-21 14:39 ` Willy Tarreau
2006-03-21 18:39 ` Rafael J. Wysocki
2006-03-21 19:32 ` Willy Tarreau
2006-03-21 21:47 ` Rafael J. Wysocki
2006-03-21 22:51 ` Peter Williams
2006-03-22 3:49 ` Mike Galbraith
2006-03-22 3:59 ` Peter Williams
2006-03-22 12:14 ` [interbench numbers] " Mike Galbraith
2006-03-22 20:27 ` Con Kolivas
2006-03-23 3:22 ` Mike Galbraith
2006-03-23 5:43 ` Con Kolivas
2006-03-23 5:53 ` Mike Galbraith
2006-03-23 11:07 ` Mike Galbraith
2006-03-24 0:21 ` Con Kolivas
2006-03-24 5:02 ` Mike Galbraith
2006-03-24 5:04 ` Con Kolivas
2006-03-17 12:38 ` [PATCH] sched: activate SCHED BATCH expired Con Kolivas
2006-03-17 13:07 ` Ingo Molnar
2006-03-17 13:26 ` Nick Piggin
2006-03-17 13:36 ` Con Kolivas
2006-03-17 13:46 ` Nick Piggin
2006-03-17 13:51 ` Nick Piggin
2006-03-17 14:11 ` Con Kolivas
2006-03-17 14:59 ` Ingo Molnar
2006-03-17 13:47 ` [ck] " Andreas Mohr
2006-03-17 13:59 ` Con Kolivas
2006-03-17 14:06 ` Nick Piggin
2006-03-08 8:48 ` [ck] Re: [PATCH] mm: yield during swap prefetching Andreas Mohr
2006-03-08 8:48 ` Andreas Mohr
2006-03-08 8:52 ` Con Kolivas
2006-03-08 8:52 ` Con Kolivas
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