From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754244AbaBTNN0 (ORCPT ); Thu, 20 Feb 2014 08:13:26 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:39756 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753552AbaBTNNZ (ORCPT ); Thu, 20 Feb 2014 08:13:25 -0500 Message-ID: <5305FF70.2030406@canonical.com> Date: Thu, 20 Feb 2014 14:13:20 +0100 From: Maarten Lankhorst User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: Fengguang Wu CC: LKML , lkp@01.org Subject: Re: [x86] 339a3922f6: +4.3% aim7 jobs-per-min References: <20140220130646.GA22815@localhost> In-Reply-To: <20140220130646.GA22815@localhost> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org op 20-02-14 14:06, Fengguang Wu schreef: > Hi Maarten, > > We are glad to find that your commit 339a3922f68dcb7d93001f07b7e914d5cf6c066d > ("decrease useless padding") increased aim disk_src performance by 4.3%: > > 74833276be6802b 339a3922f68dcb7d93001f07b > --------------- ------------------------- > 511685 ~ 0% +4.3% 533571 ~ 0% TOTAL aim7.2000.jobs-per-min > 77.30 ~ 0% -9.9% 69.66 ~ 0% TOTAL time.system_time > 1.95 ~ 2% +7.0% 2.09 ~ 2% TOTAL iostat.sda.rrqm/s > 23.57 ~ 0% -4.1% 22.60 ~ 0% TOTAL time.elapsed_time > 425 ~ 0% -3.1% 412 ~ 0% TOTAL time.percent_of_cpu_this_job_got > 7.59 ~ 0% -2.9% 7.37 ~ 0% TOTAL boottime.dhcp > 15.24 ~ 0% -1.9% 14.94 ~ 0% TOTAL boottime.boot > Really? I just did it to get rid of the 15-byte nop sequences with tons of prefixes. Interesting.. ~Maarten