From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755427AbaHUNvA (ORCPT ); Thu, 21 Aug 2014 09:51:00 -0400 Received: from mga11.intel.com ([192.55.52.93]:57100 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754838AbaHUNu7 (ORCPT ); Thu, 21 Aug 2014 09:50:59 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,909,1400050800"; d="scan'208";a="579887767" Date: Thu, 21 Aug 2014 21:50:35 +0800 From: Fengguang Wu To: Pranith Kumar Cc: Dave Hansen , "Paul E. McKenney" , LKML , lkp@01.org Subject: [rcu] 0eb885afb20: -25.8% softirqs.RCU Message-ID: <20140821135035.GA19246@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Pranith, FYI, these changes look nice: git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev commit 0eb885afb20317016670c1c5dd3a436c91e1e910 ("rcu: Use rcu_gp_kthread_wake() to wake up grace period kthreads") test case: lkp-a04/aim7/400-disk_rr It's an in-memory aim7/disk_rr test. lkp-a04 is an Atom micro server with 8G Memory. 5db6a289a3a0a69 0eb885afb20317016670c1c5d --------------- ------------------------- 150860 ± 1% -25.8% 111937 ± 1% TOTAL softirqs.RCU 2809 ± 1% -12.5% 2457 ± 1% TOTAL vmstat.system.cs 4202 ± 1% -6.9% 3911 ± 1% TOTAL vmstat.system.in 212421 ± 2% -7.7% 196035 ± 3% TOTAL time.involuntary_context_switches vmstat.system.in 4300 ++-------------------------------------------------------------------+ | .*.. *.. .*.. * | 4250 *+ .*.. + .*. * *.. .. : | 4200 ++ *..*..*. *.. + *..*. : .. * : | | * : .* : .* | 4150 ++ : .*..*. *. | 4100 ++ *. | | | 4050 ++ | 4000 ++ | | O O O O O | 3950 O+ O O O O O O O O O O | 3900 ++ O O O O | | O | 3850 ++-------------------------O-----------------------------------O-----O vmstat.system.cs 3000 ++-------------------------------------------------------------------+ | | 2900 ++ *.. | *..*..*..*..*..*..*.. .. *..*..*..*..*.. .*.. .*.. | 2800 ++ * .*. *. .* | | *..*..*. *. | 2700 ++ | | | 2600 ++ | | O O | 2500 O+ O O O O O O O O O O O | | O O O O O | 2400 ++ O O O O | O | 2300 ++-------------------------------------------------------------------+ [*] bisect-good sample [O] bisect-bad sample Disclaimer: Results have been estimated based on internal Intel analysis and are provided for informational purposes only. Any difference in system hardware or software design or configuration may affect actual performance. Thanks, Fengguang