Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161065AbVLWV7l (ORCPT ); Fri, 23 Dec 2005 16:59:41 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161063AbVLWV7l (ORCPT ); Fri, 23 Dec 2005 16:59:41 -0500 Received: from mustang.oldcity.dca.net ([216.158.38.3]:46237 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S1161065AbVLWV7k (ORCPT ); Fri, 23 Dec 2005 16:59:40 -0500 Subject: Re: [PATCH] sched: Fix adverse effects of NFS client on interactive response From: Lee Revell To: Trond Myklebust Cc: Peter Williams , Kyle Moffett , Ingo Molnar , Con Kolivas , Linux Kernel Mailing List In-Reply-To: <1135372999.8555.19.camel@lade.trondhjem.org> References: <43A8EF87.1080108@bigpond.net.au> <1135145341.7910.17.camel@lade.trondhjem.org> <43A8F714.4020406@bigpond.net.au> <1135171280.7958.16.camel@lade.trondhjem.org> <962C9716-6F84-477B-8B2A-FA771C21CDE8@mac.com> <1135172453.7958.26.camel@lade.trondhjem.org> <43AA0EEA.8070205@bigpond.net.au> <1135289282.9769.2.camel@lade.trondhjem.org> <43AB29B8.7050204@bigpond.net.au> <1135292364.9769.58.camel@lade.trondhjem.org> <1135297525.3685.57.camel@lade.trondhjem.org> <43AB69B8.4080707@bigpond.net.au> <1135330757.8167.44.camel@lade.trondhjem.org> <1135364822.22177.13.camel@mindpipe> <1135372090.8555.9.camel@lade.trondhjem.org> <1135372661.22177.46.camel@mindpipe> <1135372999.8555.19.camel@lade.trondhjem.org> Content-Type: text/plain Date: Fri, 23 Dec 2005 17:04:11 -0500 Message-Id: <1135375452.22177.62.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.4.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1309 Lines: 32 On Fri, 2005-12-23 at 22:23 +0100, Trond Myklebust wrote: > On Fri, 2005-12-23 at 16:17 -0500, Lee Revell wrote: > > On Fri, 2005-12-23 at 22:08 +0100, Trond Myklebust wrote: > > > On Fri, 2005-12-23 at 14:07 -0500, Lee Revell wrote: > > > > > > > By your logic it's also broken to use cond_resched() in filesystem code. > > > > > > ...and your point is? > > > > Reductio ad absurdum. Subsystems not using cond_resched would render > > Linux unusable for even trivial soft realtime applications like AV > > playback and recording. > > It may surprise you to learn that some people don't use their computers > for AV playback and recording. However absurd it may seem to you, those > people are quite happy to use 2.4.x kernels without a cond_resched > lurking in every nook and cranny. Of course, but I think a reasonable goal for 2.6 is to maintain the server side performance of 2.4 but also enable desktop type applications to work well. cond_resched is really a temporary hack to make the desktop usable until the kernel becomes fully preemptible. Lee - 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/