From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754476AbcBPIvT (ORCPT ); Tue, 16 Feb 2016 03:51:19 -0500 Received: from casper.infradead.org ([85.118.1.10]:47660 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751176AbcBPIvR (ORCPT ); Tue, 16 Feb 2016 03:51:17 -0500 Date: Tue, 16 Feb 2016 09:51:11 +0100 From: Peter Zijlstra To: Waiman Long Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Linus Torvalds , Ding Tianhong , Jason Low , Davidlohr Bueso , "Paul E. McKenney" , Thomas Gleixner , Will Deacon , Tim Chen Subject: Re: [PATCH v2 0/4] locking/mutex: Enable optimistic spinning of lock waiter Message-ID: <20160216085111.GR6357@twins.programming.kicks-ass.net> References: <1455298335-53229-1-git-send-email-Waiman.Long@hpe.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1455298335-53229-1-git-send-email-Waiman.Long@hpe.com> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Feb 12, 2016 at 12:32:11PM -0500, Waiman Long wrote: > My own test on a 4-socket E7-4820 v3 system showed a regression of > about 4% in the high_systime workload with Peter's patch which this > new patch effectively eliminates. > > Testing on an 8-socket Westmere-EX server, however, has performance > change from -9% to than +140% on the fserver workload of AIM7 > depending on how the system was set up. Subject: [lkp] [locking/mutex] aaca135480: -72.9% fsmark.files_per_sec My patch also generated the above email. Please also test that benchmark against this approach.