From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: SLUB performance regression vs SLAB Date: Thu, 04 Oct 2007 13:55:37 -0700 (PDT) Message-ID: <20071004.135537.39158051.davem@davemloft.net> References: <20071004183224.GA8641@linux.intel.com> <20071004192824.GA9852@linux.intel.com> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: clameter@sgi.com, nickpiggin@yahoo.com.au, hch@lst.de, mel@skynet.ie, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, dgc@sgi.com, jens.axboe@oracle.com, suresh.b.siddha@intel.com To: willy@linux.intel.com Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:33806 "EHLO sunset.davemloft.net" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1758406AbXJDUzi (ORCPT ); Thu, 4 Oct 2007 16:55:38 -0400 In-Reply-To: <20071004192824.GA9852@linux.intel.com> Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org From: willy@linux.intel.com (Matthew Wilcox) Date: Thu, 4 Oct 2007 12:28:25 -0700 > On Thu, Oct 04, 2007 at 10:49:52AM -0700, Christoph Lameter wrote: > > Finally: Is there some way that I can reproduce the tests on my machines? > > As usual for these kinds of setups ... take a two-CPU machine, 64GB > of memory, half a dozen fibre channel adapters, about 3000 discs, > a commercial database, a team of experts for three months worth of > tuning ... Anything, I do mean anything, can be simulated using small test programs. Pointing at a big fancy machine with lots of storage and disk is a passive aggressive way to avoid the real issues, in that nobody is putting forth the effort to try and come up with an at least publishable test case that Christoph can use to help you guys. If coming up with a reproducable and publishable test case is the difference between this getting fixed and it not getting fixed, are you going to invest the time to do that?