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From: Rik van Riel <riel@imladris.surriel.com>
To: Mike Galbraith <efault@gmx.de>
Cc: davidm@hpl.hp.com, "" <linux-kernel@vger.kernel.org>,
	"" <linux-ia64@linuxia64.org>
Subject: Re: web page on O(1) scheduler
Date: Wed, 21 May 2003 20:38:56 -0400 (EDT)	[thread overview]
Message-ID: <Pine.LNX.4.50L.0305212038120.5425-100000@imladris.surriel.com> (raw)
In-Reply-To: <5.2.0.9.2.20030521111037.01ed0d58@pop.gmx.net>

On Wed, 21 May 2003, Mike Galbraith wrote:
> At 11:49 PM 5/20/2003 -0700, David Mosberger wrote:
> >Recently, I started to look into some odd performance behaviors of the
> >O(1) scheduler.  I decided to document what I found in a web page
> >at:
> >
> >         http://www.hpl.hp.com/research/linux/kernel/o1.php
>
> The page mentions persistent starvation.  My own explorations of this
> issue indicate that the primary source is always selecting the highest
> priority queue.

It's deeper than that.  The O(1) scheduler doesn't consider
actual CPU usage as a factor of CPU priority.


Rik
-- 
Engineers don't grow up, they grow sideways.
http://www.surriel.com/		http://kernelnewbies.org/

  parent reply	other threads:[~2003-05-22  0:25 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-05-21  6:49 web page on O(1) scheduler David Mosberger
2003-05-21  9:01 ` Arjan van de Ven
2003-05-21 10:40   ` [Linux-ia64] " Duraid Madina
2003-05-21 10:43     ` Christoph Hellwig
2003-05-21 13:12     ` Arjan van de Ven
2003-05-21 13:51       ` Olivier Galibert
2003-05-28 22:12         ` Bill Davidsen
     [not found]         ` <Pine.LNX.3.96.1030528180909.21414B-100000@gatekeeper.tmr.c om>
2003-05-29  5:59           ` Mike Galbraith
2003-06-02  8:05             ` Ingo Molnar
2003-06-04  4:07               ` Bill Davidsen
     [not found]             ` <Pine.LNX.4.44.0306020949520.3375-100000@localhost.localdom ain>
2003-06-02 13:51               ` Mike Galbraith
2003-06-04  3:52             ` Bill Davidsen
2003-06-04  4:55               ` David Schwartz
     [not found]             ` <Pine.LNX.3.96.1030603234616.16495B-100000@gatekeeper.tmr.c om>
2003-06-04  7:13               ` Mike Galbraith
2003-06-04 15:30                 ` Jan Harkes
2003-05-21 19:18       ` Duraid Madina
2003-05-21 20:03         ` Helge Hafting
2003-05-21 22:59         ` Alan Cox
2003-05-21 15:18   ` David Mosberger
2003-05-23  1:07   ` [Linux-ia64] " Hans Boehm
2003-05-23  8:30     ` Arjan van de Ven
2003-05-21  9:26 ` Mike Galbraith
2003-05-21  9:30   ` Mike Galbraith
2003-05-21 17:56   ` David Mosberger
2003-05-21 20:46     ` Mike Galbraith
2003-05-22  9:52     ` Mike Galbraith
2003-05-22 16:25       ` Mike Galbraith
2003-05-22 17:58         ` David Mosberger
2003-05-27 15:16         ` [case closed] " Mike Galbraith
2003-06-03 20:59       ` sched.c gives ICE [Was: Re: web page on O(1) scheduler] J.A. Magallon
2003-06-03 22:29         ` Mike Galbraith
2003-06-22 22:03         ` J.A. Magallon
2003-06-22 22:10           ` J.A. Magallon
2003-05-22  0:38   ` Rik van Riel [this message]
     [not found]   ` <Pine.LNX.4.50L.0305212038120.5425-100000@imladris.surriel. com>
2003-05-22  5:52     ` web page on O(1) scheduler Mike Galbraith
2003-05-22 14:47       ` Valdis.Kletnieks
2003-05-22 16:12         ` Mike Galbraith
2003-05-25  9:17       ` Mike Galbraith
2003-05-21 18:31 ` [Linux-ia64] " David Mosberger
2003-05-21 20:00   ` Cyclades Cyclom-Y ISA on 2.5.69 John Stoffel

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