Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030291AbWCULVA (ORCPT ); Tue, 21 Mar 2006 06:21:00 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030294AbWCULU7 (ORCPT ); Tue, 21 Mar 2006 06:20:59 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:8163 "EHLO mx2.mail.elte.hu") by vger.kernel.org with ESMTP id S1030291AbWCULU6 (ORCPT ); Tue, 21 Mar 2006 06:20:58 -0500 Date: Tue, 21 Mar 2006 12:18:50 +0100 From: Ingo Molnar To: Willy Tarreau Cc: Mike Galbraith , lkml , Andrew Morton , Con Kolivas , bugsplatter@gmail.com Subject: Re: interactive task starvation Message-ID: <20060321111850.GA2776@elte.hu> References: <200603090036.49915.kernel@kolivas.org> <20060317090653.GC13387@elte.hu> <1142592375.7895.43.camel@homer> <1142615721.7841.15.camel@homer> <1142838553.8441.13.camel@homer> <20060321064723.GH21493@w.ods.org> <1142927498.7667.34.camel@homer> <20060321091353.GA25248@w.ods.org> <20060321091422.GA9207@elte.hu> <20060321111552.GA25651@w.ods.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060321111552.GA25651@w.ods.org> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: -2.6 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.6 required=5.9 tests=ALL_TRUSTED,AWL,BAYES_50 autolearn=no SpamAssassin version=3.0.3 -3.3 ALL_TRUSTED Did not pass through any untrusted hosts 0.0 BAYES_50 BODY: Bayesian spam probability is 40 to 60% [score: 0.5000] 0.7 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1770 Lines: 45 * Willy Tarreau wrote: > On Tue, Mar 21, 2006 at 10:14:22AM +0100, Ingo Molnar wrote: > > > > * Willy Tarreau wrote: > > > > > > > > On Tue, Mar 21, 2006 at 08:51:38AM +0100, Mike Galbraith wrote: > > > > On Tue, 2006-03-21 at 07:47 +0100, Willy Tarreau wrote: > > > > > Hi Mike, > > > > > > > > Greetings! > > > > > > Thanks for the details, > > > I'll try to find some time to test your code quickly. If this fixes this > > > long standing problem, we should definitely try to get it into 2.6.17 ! > > > > the time window is quickly closing for that to happen though. > > Ingo, Mike, > > it's a great day :-) > > Right now, I'm typing this mail from my notebook which has 8 instances > of my exploit running in background. Previously, 4 of them were enough > on this machine to create pauses of up to 31 seconds. Right now, I can > type normally, and I simply can say that my exploit has no effect > anymore ! It's just consuming CPU and nothing else. I also tried to > write 0 to grace_g[12] and I find it even more responsive with 0 in > those values. I've not had time to do more extensive tests, but I can > assure you that the problem is clearly solved for me. I'd like Grant > to test ssh on his firewall with it too. great work by Mike! One detail: i'd like there to be just one default throttling value, i.e. no grace_g tunables [so that we have just one default scheduler behavior]. Is the default grace_g[12] setting good enough for your workload? Ingo - 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/