Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754148AbYCXVHI (ORCPT ); Mon, 24 Mar 2008 17:07:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752321AbYCXVGz (ORCPT ); Mon, 24 Mar 2008 17:06:55 -0400 Received: from netops-testserver-3-out.sgi.com ([192.48.171.28]:60781 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750723AbYCXVGy (ORCPT ); Mon, 24 Mar 2008 17:06:54 -0400 Date: Mon, 24 Mar 2008 14:05:02 -0700 (PDT) From: Christoph Lameter X-X-Sender: clameter@schroedinger.engr.sgi.com To: David Miller cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org, torvalds@linux-foundation.org Subject: Re: larger default page sizes... In-Reply-To: <20080324.133722.38645342.davem@davemloft.net> Message-ID: References: <20080321.145712.198736315.davem@davemloft.net> <20080324.133722.38645342.davem@davemloft.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1352 Lines: 34 On Mon, 24 Mar 2008, David Miller wrote: > From: Christoph Lameter > Date: Mon, 24 Mar 2008 11:27:06 -0700 (PDT) > > > The move to 64k page size on IA64 is another way that this issue can > > be addressed though. > > This is such a huge mistake I wish platforms such as powerpc and IA64 > would not make such decisions so lightly. Its certainly not a light decision if your customer tells you that the box is almost unusable with 16k page size. For our new 2k and 4k processor systems this seems to be a requirement. Customers start hacking SLES10 to run with 64k pages.... > The memory wastage is just rediculious. Well yes if you would use such a box for kernel compiles and small files then its a bad move. However, if you have to process terabytes of data then this is significantly reducing the VM and I/O overhead. > I already see several distributions moving to 64K pages for powerpc, > so I want to nip this in the bud before this monkey-see-monkey-do > thing gets any more out of hand. powerpc also runs HPC codes. They certainly see the same results that we see. -- 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/