From: David Mosberger-Tang <David.Mosberger@acm.org>
To: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Minor scheduler fix to get rid of skipping in xmms
Date: 09 Sep 2003 16:24:24 -0700 [thread overview]
Message-ID: <ug8yoxsfyv.fsf@panda.mostang.com> (raw)
In-Reply-To: <tZjz.4Bn.7@gated-at.bofh.it>
>>>>> On Wed, 10 Sep 2003 00:40:09 +0200, Andrew Morton <akpm@osdl.org> said:
Andrew> Steven Pratt <slpratt@austin.ibm.com> wrote:
>> >ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.0-test4/2.6.0-test4-mm6/broken-out/sched-CAN_MIGRATE_TASK-fix.patch
>> >
>> This patch improves specjjb over test5 and has no real effect on
>> any of kernbench, volanomark or specsdet.
Andrew> Fine, it's a good fix.
Is it that simple? My reading is that it will do very bad things,
e.g., to pipe roundtrip latency on SMP machines. Something that the
O(1) scheduler has handled nicely so far.
My preference would have been to break affinity only in the presence
of a _persistent_ load imbalance of >> 1. For example, it's perfectly
OK and indeed encouraged to run N tasks on one and the same CPU, if
those tasks are (almost) never runnable at the same time.
--david
--
Interested in learning more about IA-64 Linux? Try http://www.lia64.org/book/
next parent reply other threads:[~2003-09-09 23:34 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <tCPY.4xU.1@gated-at.bofh.it>
[not found] ` <tDsR.5tY.31@gated-at.bofh.it>
[not found] ` <tZ0f.49P.5@gated-at.bofh.it>
[not found] ` <tZjz.4Bn.7@gated-at.bofh.it>
2003-09-09 23:24 ` David Mosberger-Tang [this message]
2003-09-11 23:32 [PATCH] Minor scheduler fix to get rid of skipping in xmms Craig Thomas
-- strict thread matches above, loose matches on Subject: below --
2003-09-11 2:55 Andrew Theurer
2003-09-11 11:04 ` Nick Piggin
2003-09-11 13:05 ` Andrew Theurer
2003-09-11 13:53 ` Nick Piggin
2003-09-11 14:37 ` Andrew Theurer
2003-09-08 22:27 Steven Pratt
2003-09-08 22:56 ` Andrew Morton
2003-09-08 23:22 ` William Lee Irwin III
2003-09-09 2:10 ` Con Kolivas
2003-09-09 2:16 ` Con Kolivas
2003-09-09 2:31 ` Con Kolivas
2003-09-09 2:33 ` Andrew Morton
2003-09-09 4:14 ` Nick Piggin
2003-09-09 6:49 ` Con Kolivas
2003-09-09 23:53 ` Cliff White
2003-09-10 2:12 ` Nick Piggin
2003-09-10 19:05 ` Steven Pratt
2003-09-10 20:23 ` Dave Hansen
[not found] ` <3F5FE385.10204@cyberone.com.au>
[not found] ` <3F607E62.3010903@austin.ibm.com>
[not found] ` <3F60873B.4000005@cyberone.com.au>
2003-09-11 22:57 ` Steven Pratt
2003-09-11 0:14 ` Cliff White
2003-09-09 22:06 ` Steven Pratt
2003-09-09 22:12 ` Andrew Morton
2003-09-10 13:59 ` Steven Pratt
2003-09-10 18:51 ` Steven Pratt
2003-09-06 15:58 John Yau
2003-09-06 16:57 ` Michael Buesch
2003-09-06 9:46 John Yau
2003-09-06 10:03 ` Michael Buesch
2003-09-06 17:01 ` Robert Love
2003-09-06 17:59 ` John Yau
2003-09-06 18:17 ` John Yau
2003-09-06 19:42 ` Rahul Karnik
2003-09-06 20:04 ` Robert Love
2003-09-06 22:41 ` John Yau
2003-09-07 2:40 ` Martin J. Bligh
2003-09-07 5:13 ` Nick Piggin
2003-09-07 7:48 ` Johnny Yau
2003-09-07 8:10 ` Nick Piggin
2003-09-07 8:35 ` John Yau
2003-09-07 9:26 ` Nick Piggin
2003-09-07 17:30 ` John Yau
2003-09-07 17:36 ` Nick Piggin
2003-09-08 0:22 ` Con Kolivas
2003-09-08 0:27 ` David Lang
2003-09-08 0:47 ` Con Kolivas
2003-09-07 5:08 ` Nick Piggin
2003-09-07 6:18 ` Andrew Morton
2003-09-07 6:29 ` Nick Piggin
2003-09-07 6:45 ` Andrew Morton
2003-09-07 6:59 ` Nick Piggin
2003-09-07 7:02 ` Nick Piggin
2003-09-07 14:32 ` Martin J. Bligh
2003-09-07 17:02 ` Robert Love
2003-09-07 17:34 ` Andrew Morton
2003-09-07 18:12 ` Nick Piggin
2003-09-07 18:13 ` Nick Piggin
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