From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 24 Mar 2008 14:05:02 -0700 (PDT) From: Christoph Lameter 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: owner-linux-mm@kvack.org Return-Path: To: David Miller Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-ia64@vger.kernel.org, torvalds@linux-foundation.org List-ID: 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, 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