From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner+w=401wt.eu-S2992706AbXCBWx4@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S2992706AbXCBWx4 (ORCPT <rfc822;w@1wt.eu>);
	Fri, 2 Mar 2007 17:53:56 -0500
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2992707AbXCBWx4
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Fri, 2 Mar 2007 17:53:56 -0500
Received: from mx1.redhat.com ([66.187.233.31]:51680 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S2992706AbXCBWxz (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Fri, 2 Mar 2007 17:53:55 -0500
Message-ID: <45E8AAB9.7040707@redhat.com>
Date: Fri, 02 Mar 2007 17:52:41 -0500
From: Chuck Ebbert <cebbert@redhat.com>
Organization: Red Hat
User-Agent: Thunderbird 1.5.0.9 (X11/20070212)
MIME-Version: 1.0
To: Rik van Riel <riel@redhat.com>
CC: Andrew Morton <akpm@linux-foundation.org>,
       Bill Irwin <bill.irwin@oracle.com>,
       Christoph Lameter <clameter@engr.sgi.com>, Mel Gorman <mel@skynet.ie>,
       npiggin@suse.de, mingo@elte.hu, jschopp@austin.ibm.com,
       arjan@infradead.org, torvalds@linux-foundation.org, mbligh@mbligh.org,
       linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: The performance and behaviour of the anti-fragmentation related
 patches
References: <20070301101249.GA29351@skynet.ie>	<20070301160915.6da876c5.akpm@linux-foundation.org>	<45E842F6.5010105@redhat.com>	<20070302085838.bcf9099e.akpm@linux-foundation.org>	<Pine.LNX.4.64.0703020919350.16719@schroedinger.engr.sgi.com>	<20070302093501.34c6ef2a.akpm@linux-foundation.org>	<45E8624E.2080001@redhat.com>	<20070302100619.cec06d6a.akpm@linux-foundation.org>	<Pine.LNX.4.64.0703021012170.17676@schroedinger.engr.sgi.com>	<45E86BA0.50508@redhat.com>	<20070302211207.GJ10643@holomorphy.com>	<45E894D7.2040309@redhat.com>	<20070302135243.ada51084.akpm@linux-foundation.org>	<45E89F1E.8020803@redhat.com> <20070302142256.0127f5ac.akpm@linux-foundation.org> <45E8A677.7000205@redhat.com>
In-Reply-To: <45E8A677.7000205@redhat.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
X-Mailing-List: linux-kernel@vger.kernel.org

Rik van Riel wrote:
> 32GB is pretty much the minimum size to reproduce some of these
> problems. Some workloads may need larger systems to easily trigger
> them.
> 

Hundreds of disks all doing IO at once may also be needed, as
wli points out. Such systems are not readily available for testing.