Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753161Ab3FQXUY (ORCPT ); Mon, 17 Jun 2013 19:20:24 -0400 Received: from mga09.intel.com ([134.134.136.24]:59611 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752733Ab3FQXUV (ORCPT ); Mon, 17 Jun 2013 19:20:21 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,884,1363158000"; d="scan'208";a="331162690" Message-ID: <51BF99B0.4040509@intel.com> Date: Tue, 18 Jun 2013 07:20:16 +0800 From: Alex Shi User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120912 Thunderbird/15.0.1 MIME-Version: 1.0 To: Davidlohr Bueso CC: Tim Chen , Ingo Molnar , Rik van Riel , Peter Zijlstra , Andrea Arcangeli , Mel Gorman , Andi Kleen , Andrew Morton , Michel Lespinasse , "Wilcox, Matthew R" , Dave Hansen , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" Subject: Re: Performance regression from switching lock to rw-sem for anon-vma tree References: <1371165333.27102.568.camel@schen9-DESK> <1371167015.1754.14.camel@buesod1.americas.hpqcorp.net> <51BD8A77.2080201@intel.com> <1371486122.1778.14.camel@buesod1.americas.hpqcorp.net> In-Reply-To: <1371486122.1778.14.camel@buesod1.americas.hpqcorp.net> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1032 Lines: 23 On 06/18/2013 12:22 AM, Davidlohr Bueso wrote: > After a lot of benchmarking, I finally got the ideal results for aim7, > so far: this patch + optimistic spinning with preemption disabled. Just > like optimistic spinning, this patch by itself makes little to no > difference, yet combined is where we actually outperform 3.10-rc5. In > addition, I noticed extra throughput when disabling preemption in > try_optimistic_spin(). > > With i_mmap as a rwsem and these changes I could see performance > benefits for alltests (+14.5%), custom (+17%), disk (+11%), high_systime > (+5%), shared (+15%) and short (+4%), most of them after around 500 > users, for fewer users, it made little to no difference. A pretty good number. what's the cpu number in your machine? :) -- Thanks Alex -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/