From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail144.messagelabs.com (mail144.messagelabs.com [216.82.254.51]) by kanga.kvack.org (Postfix) with SMTP id A9B326B003D for ; Tue, 24 Mar 2009 11:35:19 -0400 (EDT) Received: from localhost (smtp.ultrahosting.com [127.0.0.1]) by smtp.ultrahosting.com (Postfix) with ESMTP id EC43B82D0ED for ; Tue, 24 Mar 2009 11:55:26 -0400 (EDT) Received: from smtp.ultrahosting.com ([74.213.174.254]) by localhost (smtp.ultrahosting.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UMLaYBPCMP0m for ; Tue, 24 Mar 2009 11:55:26 -0400 (EDT) Received: from qirst.com (unknown [74.213.171.31]) by smtp.ultrahosting.com (Postfix) with ESMTP id 2BF2482D10B for ; Tue, 24 Mar 2009 11:55:22 -0400 (EDT) Date: Tue, 24 Mar 2009 11:44:48 -0400 (EDT) From: Christoph Lameter Subject: Re: why my systems never cache more than ~900 MB? In-Reply-To: <49C8FDD4.7070900@wpkg.org> Message-ID: References: <49C89CE0.2090103@wpkg.org> <200903250220.45575.nickpiggin@yahoo.com.au> <49C8FDD4.7070900@wpkg.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Tomasz Chmielewski Cc: Nick Piggin , linux-mm@kvack.org List-ID: On Tue, 24 Mar 2009, Tomasz Chmielewski wrote: > Nick Piggin schrieb: > Does not help me, as what interests me here on these machines is mainly > caching block device data; they are iSCSI targets and access block devices > directly. You can run a 64 bit kernel on those machines. 64 bit kernels can use 32 bit userspace without a problem. Just install an additional kernel and try booting your existing setup with it. > What split should I choose to enable blockdev mapping on the whole memory on > 32 bit system with 3 or 4 GB RAM? Is it possible with 4 GB RAM at all? A 64 bit kernel will do the trick. -- 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