From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Pekka Enberg" Subject: Re: [patch 21/21] slab defrag: Obsolete SLAB Date: Mon, 12 May 2008 10:54:47 +0300 Message-ID: <84144f020805120054t1370236ei5ff52279457e026e@mail.gmail.com> References: <20080510030831.796641881@sgi.com> <20080510030919.604216074@sgi.com> <4825709A.2020407@firstfloor.org> <20080510221515.3540a6cc@bree.surriel.com> <2f11576a0805120038s334dc56cuaf16b8b7c6f87098@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "Rik van Riel" , "Andi Kleen" , "Christoph Lameter" , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, "Mel Gorman" , mpm@selenic.com, "Matthew Wilcox" , "Zhang, Yanmin" To: "KOSAKI Motohiro" Return-path: Received: from rv-out-0506.google.com ([209.85.198.239]:47415 "EHLO rv-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752015AbYELHyu (ORCPT ); Mon, 12 May 2008 03:54:50 -0400 Received: by rv-out-0506.google.com with SMTP id l9so2531624rvb.1 for ; Mon, 12 May 2008 00:54:47 -0700 (PDT) In-Reply-To: <2f11576a0805120038s334dc56cuaf16b8b7c6f87098@mail.gmail.com> Content-Disposition: inline Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Mon, May 12, 2008 at 10:38 AM, KOSAKI Motohiro wrote: > > > What about the TPC performance regressions? My understanding was that > > > slub still performed worse in the "object allocated on one CPU, freed on > > > the other CPU" type workloads due to less batching. > > > > Which can be the majority of object allocations and frees in some > > workloads. It definately wants fixing. > > Agreed, that situation is very frequency happend, IMHO. Christoph fixed a tbench regression that was in the same ballpark as the TPC regression reported by Matthew which is why we've asked the Intel folks to re-test. But yeah, we're working on it.