Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762624AbXIVKCE (ORCPT ); Sat, 22 Sep 2007 06:02:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751230AbXIVKBz (ORCPT ); Sat, 22 Sep 2007 06:01:55 -0400 Received: from mail.gmx.net ([213.165.64.20]:33472 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755174AbXIVKBx (ORCPT ); Sat, 22 Sep 2007 06:01:53 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1/qm1V5ej7qexYccL6KH9MqWaAZ6y7IUEMt5D6Ghh Os+X7NSRrCZ34Y Subject: Re: [git] CFS-devel, group scheduler, fixes From: Mike Galbraith To: Tong Li Cc: Ingo Molnar , dimm , linux-kernel@vger.kernel.org, Srivatsa Vaddagiri , Peter Zijlstra In-Reply-To: References: <1190144190.5204.24.camel@earth> <20070918201622.GA1632@elte.hu> <1190183324.9737.7.camel@Homer.simpson.net> <1190188261.9185.21.camel@Homer.simpson.net> <1190191368.8687.5.camel@Homer.simpson.net> <1190264114.6411.4.camel@Homer.simpson.net> <1190272507.27867.20.camel@Homer.simpson.net> <20070920075155.GA31641@elte.hu> <1190275870.9232.6.camel@Homer.simpson.net> Content-Type: text/plain Date: Sat, 22 Sep 2007 12:01:48 +0200 Message-Id: <1190455308.7404.19.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 Content-Length: 1510 Lines: 39 On Fri, 2007-09-21 at 20:27 -0700, Tong Li wrote: > Mike, > > Could you try this patch to see if it solves the latency problem? No, but it helps some when running two un-pinned busy loops, one at nice 0, and the other at nice 19. Yesterday I hit latencies of up to 1.2 _seconds_ doing this, and logging sched_debug and /proc/`pidof Xorg`/sched from SCHED_RR shells. se.wait_max : 164.242748 se.wait_max : 121.996128 se.wait_max : 194.464773 se.wait_max : 517.425411 se.wait_max : 131.453214 se.wait_max : 122.984190 se.wait_max : 111.729274 se.wait_max : 119.567580 se.wait_max : 126.980696 se.wait_max : 177.241452 se.wait_max : 129.604329 se.wait_max : 119.631657 It doesn't help at all with this oddity while running same: root@Homer: now is the time foooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooor aall good men to come to the aid of their country That was a nice 0 shell window. I'm not a great typist, but I ain't _that_ bad :) -Mike - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/