From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail203.messagelabs.com (mail203.messagelabs.com [216.82.254.243]) by kanga.kvack.org (Postfix) with SMTP id 176DF6B0088 for ; Thu, 6 Jan 2011 12:11:18 -0500 (EST) Date: Thu, 6 Jan 2011 11:09:42 -0600 From: Jack Steiner Subject: Very large memory configurations: > 16 TB Message-ID: <20110106170942.GA8253@sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Sender: owner-linux-mm@kvack.org To: linux-mm@kvack.org, mingo@elte.hu Cc: linux-ia64@vger.kernel.org List-ID: SGI is currently developing an x86_64 system with more than 16TB of memory per SSI. As far as I can tell, this should be supported. The relevant definitions such as MAX_PHYSMEM_BITS appear ok. One area of concern is page counts. Exceeding 16TB will also exceed MAX_INT page frames. The kernel (at least in all places I've found) keep pagecounts in longs. Have I missed anything? Should this > 16TB work? Are there any kernel problems or problems with user tools that anyone knows of. Any help or pointers to potential problem areas would be appreciated... --- Jack Steiner (steiner@sgi.com) SGI - Silicon Graphics, Inc. -- 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/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org