From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758570AbXGIVVn (ORCPT ); Mon, 9 Jul 2007 17:21:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755358AbXGIVVf (ORCPT ); Mon, 9 Jul 2007 17:21:35 -0400 Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:55564 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1755360AbXGIVVe (ORCPT ); Mon, 9 Jul 2007 17:21:34 -0400 Date: Mon, 9 Jul 2007 14:21:33 -0700 (PDT) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: David Miller cc: linux-kernel@vger.kernel.org, linux-mm@vger.kernel.org, suresh.b.siddha@intel.com, corey.d.gough@intel.com, penberg@cs.helsinki.fi, akpm@linux-foundation.org Subject: Re: [patch 00/10] [RFC] SLUB patches for more functionality, performance and maintenance In-Reply-To: <20070709.124359.38710002.davem@davemloft.net> Message-ID: References: <20070708034952.022985379@sgi.com> <20070707.213752.63129539.davem@davemloft.net> <20070709.124359.38710002.davem@davemloft.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 9 Jul 2007, David Miller wrote: > As Andi seemed to imply I don't even think cmpxchg is faster than > interrupt enable/disable on current generation AMD x86_64 chips, so > are you targetting this optimization solely at Intel x86 Core Duo > 32-bit chips? That's the only one I can see which will benefit from > this. Are you going to probe the cpu sub-type and patch SLUB? Not sure. The numbers I have seen in the papers indicate a potential speedup by a factor of 10 on x86 hardware. I have not done any benchmarking myself yet. > Please reconsider this change, thanks. This is an RFC after all so nothing is fixed yet. Certainly I will keep this in mind.