From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932458Ab3AJC1l (ORCPT ); Wed, 9 Jan 2013 21:27:41 -0500 Received: from mx1.redhat.com ([209.132.183.28]:10200 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757938Ab3AJC1k (ORCPT ); Wed, 9 Jan 2013 21:27:40 -0500 Date: Thu, 10 Jan 2013 00:27:23 -0200 From: Rafael Aquini To: Raghavendra K T Cc: Rik van Riel , linux-kernel@vger.kernel.org, walken@google.com, eric.dumazet@gmail.com, lwoodman@redhat.com, jeremy@goop.org, Jan Beulich , knoel@redhat.com, chegu_vinod@hp.com, mingo@redhat.com Subject: Re: [PATCH 0/5] x86,smp: make ticket spinlock proportional backoff w/ auto tuning Message-ID: <20130110022722.GA1636@x61.redhat.com> References: <20130108172632.1126898a@annuminas.surriel.com> <50ED679B.9020306@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <50ED679B.9020306@linux.vnet.ibm.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 09, 2013 at 06:20:35PM +0530, Raghavendra K T wrote: > I ran kernbench on 32 core (mx3850) machine with 3.8-rc2 base. > x base_3.8rc2 > + rik_backoff > N Min Max Median Avg Stddev > x 8 222.977 231.16 227.735 227.388 3.1512986 > + 8 218.75 232.347 229.1035 228.25425 4.2730225 > No difference proven at 95.0% confidence I got similar results on smaller systems (1 socket, dual-cores and quad-cores) when running Rik's latest series, no big difference for good nor for worse, but I also think Rik's work is meant to address bigger systems with more cores contending for any given spinlock.