From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752741AbXDHICN (ORCPT ); Sun, 8 Apr 2007 04:02:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752759AbXDHICN (ORCPT ); Sun, 8 Apr 2007 04:02:13 -0400 Received: from mail.gmx.net ([213.165.64.20]:41269 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752741AbXDHICL (ORCPT ); Sun, 8 Apr 2007 04:02:11 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1+IdBArX1eIKNOZ/C35NQzJLcuWdabt7T3XOdc+vL MAA9f02rJuNmGn Subject: Re: SD scheduler testing hitch From: Mike Galbraith To: Ingo Molnar Cc: Andrew Morton , Dmitry Adamushko , Linux Kernel , Con Kolivas In-Reply-To: <1175966255.11408.5.camel@Homer.simpson.net> References: <20070404141546.GA862@elte.hu> <20070406170319.2c961eba.akpm@linux-foundation.org> <20070407092401.GB16356@elte.hu> <1175962840.10478.49.camel@Homer.simpson.net> <1175966255.11408.5.camel@Homer.simpson.net> Content-Type: text/plain Date: Sun, 08 Apr 2007 10:02:04 +0200 Message-Id: <1176019324.8244.6.camel@Homer.simpson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.8.2 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 2007-04-07 at 19:17 +0200, Mike Galbraith wrote: > I lowered the time to 500us, and ran at nice -10.. it starves tenpercent > here every time. (ran as taskset -c 1 nice -n -10 ./fairtest) The > starving 10% duty cycle task has trouble getting 1% CPU. Hmm. Playing with it some more today, it still happens, but it's not very repeatable. Something is odd. I wonder if any SD using readers will try it. -Mike