From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030211AbWADMSx (ORCPT ); Wed, 4 Jan 2006 07:18:53 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030210AbWADMSx (ORCPT ); Wed, 4 Jan 2006 07:18:53 -0500 Received: from mail03.syd.optusnet.com.au ([211.29.132.184]:18085 "EHLO mail03.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S1030211AbWADMSw (ORCPT ); Wed, 4 Jan 2006 07:18:52 -0500 From: Con Kolivas To: Marcelo Tosatti Subject: Re: [PATCH] sched: Fix adverse effects of NFS client on interactive response Date: Wed, 4 Jan 2006 23:18:01 +1100 User-Agent: KMail/1.9 Cc: Peter Williams , Helge Hafting , Trond Myklebust , Ingo Molnar , Linux Kernel Mailing List References: <43A8EF87.1080108@bigpond.net.au> <43BB2414.6060400@bigpond.net.au> <20060104094053.GA4577@dmt.cnet> In-Reply-To: <20060104094053.GA4577@dmt.cnet> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200601042318.02028.kernel@kolivas.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wednesday 04 January 2006 20:40, Marcelo Tosatti wrote: > We suspected that the TASK_INTERACTIVE() logic in kernel/sched.c would > be moving some processes directly to the active list, thus starving some > others. So we set the nice value of all 48 processes to "nice +19" to > disable TASK_INTERACTIVE() and the starvation is gone. However with +19 > it becomes impossible to use the box interactively while the test runs, > which is the case with the default "0" nice value. > > Are there significant changes between v2.6.11 -> v2.6.14 aimed at fixing > this problem? The SCHED_BATCH policy Ingo has implemented should help just such a problem. Con