From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761339AbXGYUjc (ORCPT ); Wed, 25 Jul 2007 16:39:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752599AbXGYUjZ (ORCPT ); Wed, 25 Jul 2007 16:39:25 -0400 Received: from zrtps0kn.nortel.com ([47.140.192.55]:33276 "EHLO zrtps0kn.nortel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752706AbXGYUjZ (ORCPT ); Wed, 25 Jul 2007 16:39:25 -0400 Message-ID: <46A7B4DE.4030301@nortel.com> Date: Wed, 25 Jul 2007 14:38:54 -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: Tong Li , linux-kernel@vger.kernel.org, Chris Snook Subject: Re: [RFC] scheduler: improve SMP fairness in CFS References: <20070725110159.GA15076@elte.hu> <20070725120358.GA30755@elte.hu> <20070725192442.GC4463@elte.hu> In-Reply-To: <20070725192442.GC4463@elte.hu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 25 Jul 2007 20:38:57.0529 (UTC) FILETIME=[D2FD7E90:01C7CEFB] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Ingo Molnar wrote: > the 3s is the problem: change that to 60s! We no way want to > over-migrate for SMP fairness, the change i did gives us reasonable > long-term SMP fairness without the need for high-rate rebalancing. Actually, I do have requirements from our engineering guys for short-term fairness. They'd actually like decent fairness over even shorter intervals...1 second would be nice, 2 is acceptable. They are willing to trade off random peak performance for predictability. Chris