Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759921AbXJDRxI (ORCPT ); Thu, 4 Oct 2007 13:53:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755791AbXJDRwz (ORCPT ); Thu, 4 Oct 2007 13:52:55 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:56096 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753877AbXJDRwy (ORCPT ); Thu, 4 Oct 2007 13:52:54 -0400 Date: Thu, 4 Oct 2007 10:50:46 -0700 From: Arjan van de Ven To: Christoph Lameter Cc: Matthew Wilcox , Nick Piggin , Christoph Hellwig , Mel Gorman , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, David Chinner , Jens Axboe Subject: Re: SLUB performance regression vs SLAB Message-ID: <20071004105046.7b019fe8@laptopd505.fenrus.org> In-Reply-To: References: <20070919033605.785839297@sgi.com> <200709280742.38262.nickpiggin@yahoo.com.au> <200709281514.48293.nickpiggin@yahoo.com.au> <20071004161621.GO12049@parisc-linux.org> Organization: Intel X-Mailer: Claws Mail 3.0.1 (GTK+ 2.12.0; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 968 Lines: 23 On Thu, 4 Oct 2007 10:38:15 -0700 (PDT) Christoph Lameter wrote: > Yeah the fastpath vs. slow path is not the issue as Siddha and I > concluded earlier. Seems that we are mainly seeing cacheline bouncing > due to two cpus accessing meta data in the same page struct. The > patches in MM that are scheduled to be merged for .24 address Ok every time something says anything not 100% positive about SLUB you come back with "but it's fixed in the next patch set"... *every time*. To be honest, to me that sounds that SLUB isn't ready for prime time yet, or at least not ready to be the only one in town... The day that the answer is "the kernel.org slub is fixing all the issues" is when it's ready.. - 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/