Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755886Ab2BWLVK (ORCPT ); Thu, 23 Feb 2012 06:21:10 -0500 Received: from mailout-de.gmx.net ([213.165.64.23]:35308 "HELO mailout-de.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1755779Ab2BWLVI (ORCPT ); Thu, 23 Feb 2012 06:21:08 -0500 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1+ISQwU6YyIYeaRjU7abKoFIgmbfsjZ7fuVRS0EGv dK8VCYTjSiN1CR Message-ID: <1329996064.7411.106.camel@marge.simpson.net> Subject: Re: sched: Avoid SMT siblings in select_idle_sibling() if possible From: Mike Galbraith To: Srivatsa Vaddagiri Cc: Peter Zijlstra , Suresh Siddha , linux-kernel , Ingo Molnar , Paul Turner Date: Thu, 23 Feb 2012 12:21:04 +0100 In-Reply-To: <20120223104959.GA8454@linux.vnet.ibm.com> References: <1321435455.5072.64.camel@marge.simson.net> <1321468646.11680.2.camel@sbsiddha-desk.sc.intel.com> <1321495153.5100.7.camel@marge.simson.net> <1321544313.6308.25.camel@marge.simson.net> <1321545376.2495.1.camel@laptop> <1321547917.6308.48.camel@marge.simson.net> <1321551381.15339.21.camel@sbsiddha-desk.sc.intel.com> <1321629267.7080.13.camel@marge.simson.net> <1329748861.2293.345.camel@twins> <1329761661.6276.146.camel@marge.simpson.net> <20120223104959.GA8454@linux.vnet.ibm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.1 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1096 Lines: 34 On Thu, 2012-02-23 at 16:19 +0530, Srivatsa Vaddagiri wrote: > I am seeing 2.6% _improvement_ in volanomark score by enabling SD_BALANCE_WAKE > at SMT/MC domains. That's an unexpected (but welcome) result. > Machine : 2 Quad-core Intel X5570 CPU (H/T enabled) > Kernel : tip (HEAD at 6241cc8) > Java : OpenJDK 1.6.0_20 > Volano : 2_9_0 > > Volano benchmark was run 4 times with and w/o SD_BALANCE_WAKE enabled in > SMT/MC domains. > > Average score std. dev > > SD_BALANCE_WAKE disabled 369459.750 4825.046 > SD_BALANCE_WAKE enabled 379070.500 379070.5 > > I am going to try pipe benchmark next. Do you have suggestions for any other > benchmarks I should try to see the effect of SD_BALANCE_WAKE turned on in > SMT/MC domains? Unpinned netperf TCP_RR and/or tbench pairs? Anything that's wakeup heavy should tell the tail. -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/