From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755480AbZINPcp (ORCPT ); Mon, 14 Sep 2009 11:32:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753980AbZINPcm (ORCPT ); Mon, 14 Sep 2009 11:32:42 -0400 Received: from mail.gmx.net ([213.165.64.20]:38045 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753421AbZINPcm (ORCPT ); Mon, 14 Sep 2009 11:32:42 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1+cnzk9TnOc5wdDGi32QWms57e+PkfLcpYm/K4SVX z8oxrUoKFWdwim Subject: Re: Phoronix CFS vs BFS bencharks From: Mike Galbraith To: Marcin Letyns Cc: Nikos Chantziaras , Ingo Molnar , Con Kolivas , linux-kernel@vger.kernel.org, Peter Zijlstra In-Reply-To: References: <20090906205952.GA6516@elte.hu> <4AAE10E6.2050403@arcor.de> <1252928133.22740.37.camel@marge.simson.net> Content-Type: text/plain Date: Mon, 14 Sep 2009 17:32:15 +0200 Message-Id: <1252942335.12986.58.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.24.1.1 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.61 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2009-09-14 at 16:27 +0200, Marcin Letyns wrote: > Hello, > > Disabling NEW_FAIR_SLEEPERS makes a lot of difference here in the > Apache benchmark: > > 2.6.30.6-bfs: 7311.05 > > 2.6.30.6-cfs-fair_sl_disabled: 8249.17 > > 2.6.30.6-cfs-fair_sl_enabled: 4894.99 Wow. Some loads like wakeup preemption (mysql+oltp), and some hate it. This load appears to REALLY hate it (as does volanomark, but that thing is extremely overloaded). How many threads does that benchmark run concurrently? In any case, it's currently disabled in tip. Time will tell which benchmarks gain, and which lose. With it disabled, anything light loses when competing with hog(s). There _are_ one heck of a lot of hogs out there though, so maybe it _should_ be disabled by default. Dunno. -Mike