Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262245AbTIGG3f (ORCPT ); Sun, 7 Sep 2003 02:29:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262452AbTIGG3f (ORCPT ); Sun, 7 Sep 2003 02:29:35 -0400 Received: from static-ctb-210-9-247-166.webone.com.au ([210.9.247.166]:44294 "EHLO chimp.local.net") by vger.kernel.org with ESMTP id S262245AbTIGG3d (ORCPT ); Sun, 7 Sep 2003 02:29:33 -0400 Message-ID: <3F5AD03E.5070506@cyberone.com.au> Date: Sun, 07 Sep 2003 16:29:18 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030827 Debian/1.4-3 X-Accept-Language: en MIME-Version: 1.0 To: Andrew Morton CC: rml@tech9.net, jyau_kernel_dev@hotmail.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH] Minor scheduler fix to get rid of skipping in xmms References: <000101c374a3$2d2f9450$f40a0a0a@Aria> <1062878664.3754.12.camel@boobies.awol.org> <3F5ABD3A.7060709@cyberone.com.au> <20030906231856.6282cd44.akpm@osdl.org> In-Reply-To: <20030906231856.6282cd44.akpm@osdl.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1231 Lines: 34 Andrew Morton wrote: >Nick Piggin wrote: > >>So it is quite sad that the scheduler in 2.6 is >> sitting there doing nothing but waiting to be obsoleted, while Con's >> good (and begnin) scheduler patches are waiting around and getting >> less than 1% of the testing they need. >> > >My concern is the (large) performance regression with specjbb and >volanomark, due to increased idle time. > >We cannot just jam all this code into Linus's tree while crossing our >fingers and hoping that something will turn up to fix this problem. >Because we don't know what causes it, nor whether we even _can_ fix it. > >So this is the problem which everyone who is working on the CPU scheduler >should be concentrating on, please. > IIRC my (equivalent to Andrew's CAN_MIGRATE) patch fixed this. There was still a small (~8%?) performance regression, but idle times were on par with -linus. I don't have easy access to a largeish NUMA box, so I can't do much more. - 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/