From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jack Steiner Date: Thu, 06 Jan 2011 17:09:42 +0000 Subject: Very large memory configurations: > 16 TB Message-Id: <20110106170942.GA8253@sgi.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-mm@kvack.org, mingo@elte.hu Cc: linux-ia64@vger.kernel.org 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.