From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752994AbXDIGXX (ORCPT ); Mon, 9 Apr 2007 02:23:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753014AbXDIGXW (ORCPT ); Mon, 9 Apr 2007 02:23:22 -0400 Received: from mail.gmx.net ([213.165.64.20]:35639 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752994AbXDIGXW (ORCPT ); Mon, 9 Apr 2007 02:23:22 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX187hBB4Lb47jAo9RTZCqRhQ5c53HteoZbGHCVEJ9/ F1mZvSkN2//n8K Subject: Re: SD scheduler testing hitch From: Mike Galbraith To: Al Boldi Cc: linux-kernel@vger.kernel.org In-Reply-To: <200704082134.43029.a1426z@gawab.com> References: <200704082134.43029.a1426z@gawab.com> Content-Type: text/plain Date: Mon, 09 Apr 2007 08:23:17 +0200 Message-Id: <1176099797.6355.122.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 Sun, 2007-04-08 at 21:34 +0300, Al Boldi wrote: > Mike Galbraith wrote: > > 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. > > Tried it on mainline 2.6.20.3. > It's not easily repeatable, but it's got the same problem. > > top - 21:21:45 up 27 min, 0 users, load average: 0.80, 0.43, 0.20 > Tasks: 45 total, 3 running, 42 sleeping, 0 stopped, 0 zombie > Cpu(s): 24.3% user, 0.5% system, 0.0% nice, 75.0% idle, 0.2% IO-wait > Mem: 499488k total, 27352k used, 472136k free, 1996k buffers > Swap: 1020088k total, 0k used, 1020088k free, 9160k cached > > PID PR NI VIRT RES SHR SWAP nFLT nDRT WCHAN S %CPU TIME+ Command > 688 25 0 1804 412 352 1392 0 0 rest_init R 94.7 2:37.01 fairtest > 689 15 0 1804 264 204 1540 0 0 rest_init R 0.0 0:00.79 fairtest Aha! Thanks a bunch for testing it. (thing was irritating me greatly) -Mike