From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752243AbaHWXmz (ORCPT ); Sat, 23 Aug 2014 19:42:55 -0400 Received: from e38.co.us.ibm.com ([32.97.110.159]:50630 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751653AbaHWXmy (ORCPT ); Sat, 23 Aug 2014 19:42:54 -0400 Date: Sat, 23 Aug 2014 09:35:04 -0700 From: "Paul E. McKenney" To: Fengguang Wu Cc: Pranith Kumar , Dave Hansen , LKML , lkp@01.org Subject: Re: [rcu] 0eb885afb20: -25.8% softirqs.RCU Message-ID: <20140823163504.GA5333@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20140821135035.GA19246@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20140821135035.GA19246@localhost> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14082323-1344-0000-0000-000003AD9C58 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Aug 21, 2014 at 09:50:35PM +0800, Fengguang Wu wrote: > 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 Good show, Pranith!!! Thanx, Paul > 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 >