From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750985Ab1AWFmT (ORCPT ); Sun, 23 Jan 2011 00:42:19 -0500 Received: from mailout-de.gmx.net ([213.165.64.23]:59056 "HELO mailout-de.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750802Ab1AWFmS (ORCPT ); Sun, 23 Jan 2011 00:42:18 -0500 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1/li6Ry99Tlv8u5aBfizMLfiMYEkuKGqW5byWPhpw SOzH5pe1s2grg8 Subject: Re: 'autogroup' sched code KILLING responsiveness From: Mike Galbraith To: Michael Witten Cc: linux-kernel@vger.kernel.org In-Reply-To: References: <4d39ce58.cc7e0e0a.5448.59e4@mx.google.com> <1295648870.23779.15.camel@marge.simson.net> <4d3b4ac1.26092a0a.6f30.ffffcf6b@mx.google.com> Content-Type: text/plain; charset="UTF-8" Date: Sun, 23 Jan 2011 06:42:14 +0100 Message-ID: <1295761334.7883.5.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.30.1.2 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2011-01-22 at 21:32 -0600, Michael Witten wrote: > On Sat, Jan 22, 2011 at 15:23, Michael Witten wrote: > > Of course, I have none of these problems when I disable: > > > > CONFIG_AUTOGROUP_SCHED > > Of course, if CONFIG_AUTOGROUP_SCHED is enabled, then the problem also > goes away if the kernel is booted using the `noautogroup' parameter. I built a UP kernel for my old P4 box, and fair group scheduling doesn't appear to be working at all, whereas SMP does. It was usable, but pretty horrible. I have other (hot) things to do atm, but will investigate this. Thanks. -Mike