Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755777AbXJARqA (ORCPT ); Mon, 1 Oct 2007 13:46:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754997AbXJARps (ORCPT ); Mon, 1 Oct 2007 13:45:48 -0400 Received: from zrtps0kp.nortel.com ([47.140.192.56]:49327 "EHLO zrtps0kp.nortel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754462AbXJARpr (ORCPT ); Mon, 1 Oct 2007 13:45:47 -0400 Message-ID: <4701323F.3000500@nortel.com> Date: Mon, 01 Oct 2007 11:45:35 -0600 From: "Chris Friesen" User-Agent: Mozilla Thunderbird 1.0.2-6 (X11/20050513) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Ingo Molnar CC: Jarek Poplawski , Nick Piggin , David Schwartz , linux-kernel@vger.kernel.org, Mike Galbraith , Peter Zijlstra , Martin Michlmayr , Srivatsa Vaddagiri , Stephen Hemminger Subject: Re: Network slowdown due to CFS References: <20070926133138.GA23187@elte.hu> <20070927133123.GA6901@elte.hu> <20070927144228.GC2431@ff.dom.local> <200709281610.00682.nickpiggin@yahoo.com.au> <20071001084356.GA1866@ff.dom.local> <20071001162507.GA22791@elte.hu> <47012696.2010606@nortel.com> <20071001170903.GA2492@elte.hu> In-Reply-To: <20071001170903.GA2492@elte.hu> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 01 Oct 2007 17:45:39.0540 (UTC) FILETIME=[E1654940:01C80452] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1139 Lines: 31 Ingo Molnar wrote: > * Chris Friesen wrote: >>However, there are closed-source and/or frozen-source apps where it's >>not practical to rewrite or rebuild the app. Does it make sense to >>break the behaviour of all of these? > > > See the background and answers to that in: > > http://lkml.org/lkml/2007/9/19/357 > http://lkml.org/lkml/2007/9/19/328 > > there's plenty of recourse possible to all possible kinds of apps. Tune > the sysctl flag in one direction or another, depending on which behavior > the app is expecting. Yeah, I read those threads. It seems like the fundamental source of the disconnect is that the tasks used to be sorted by priority (thus making it easy to bump a yielding task to the end of that priority level) while now they're organized by time (making it harder to do anything priority-based). Do I have that right? Chris - 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/