From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4614E67D.7000006@shadowen.org> Date: Thu, 05 Apr 2007 13:07:25 +0100 From: Andy Whitcroft MIME-Version: 1.0 Subject: Re: [PATCH 1/4] x86_64: Switch to SPARSE_VIRTUAL References: <20070401071024.23757.4113.sendpatchset@schroedinger.engr.sgi.com> <1175550968.22373.122.camel@localhost.localdomain> <200704030031.24898.ak@suse.de> In-Reply-To: <200704030031.24898.ak@suse.de> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Andi Kleen Cc: Dave Hansen , Christoph Lameter , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, Martin Bligh , linux-mm@kvack.org, KAMEZAWA Hiroyuki List-ID: Andi Kleen wrote: > On Monday 02 April 2007 23:56:08 Dave Hansen wrote: >> On Mon, 2007-04-02 at 14:28 -0700, Christoph Lameter wrote: >>> I do not care what its called as long as it >>> covers all the bases and is not a glaring performance regresssion (like >>> SPARSEMEM so far). >> I honestly don't doubt that there are regressions, somewhere. Could you >> elaborate, and perhaps actually show us some numbers on this? Perhaps >> instead of adding a completely new model, we can adapt the existing ones >> somehow. > > If it works I would be inclined to replaced old sparsemem with Christoph's > new one on x86-64. Perhaps that could cut down the bewildering sparsemem > ifdef jungle that is there currently. > > But I presume it won't work on 32bit because of the limited address space? Right. But we might be able to do switch SPARSEMEM_EXTREME users here if performance is better and no other regressions are detected. There seems to be a theme, we need to get some numbers. I will try and get what I can with the hardware I have and see whats missing. > >> But, without some cold, hard, data, we mere mortals without the 1024-way >> machines can only guess. ;) -apw -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org