From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d01relay02.pok.ibm.com (d01relay02.pok.ibm.com [9.56.227.234]) by e3.ny.us.ibm.com (8.12.11/8.12.11) with ESMTP id j95Hvh5J002485 for ; Wed, 5 Oct 2005 13:57:43 -0400 Received: from d01av04.pok.ibm.com (d01av04.pok.ibm.com [9.56.224.64]) by d01relay02.pok.ibm.com (8.12.10/NCO/VERS6.7) with ESMTP id j95Hvgt2094050 for ; Wed, 5 Oct 2005 13:57:42 -0400 Received: from d01av04.pok.ibm.com (loopback [127.0.0.1]) by d01av04.pok.ibm.com (8.12.11/8.13.3) with ESMTP id j95Hvf8R008565 for ; Wed, 5 Oct 2005 13:57:42 -0400 Subject: Re: sparsemem & sparsemem extreme question From: Dave Hansen In-Reply-To: <20051005174542.GB10204@osiris.ibm.com> References: <20051004065030.GA21741@osiris.boeblingen.de.ibm.com> <1128442502.20208.6.camel@localhost> <20051005063909.GA9699@osiris.boeblingen.de.ibm.com> <1128527554.26009.2.camel@localhost> <20051005155823.GA10119@osiris.ibm.com> <1128528340.26009.8.camel@localhost> <20051005161009.GA10146@osiris.ibm.com> <1128529222.26009.16.camel@localhost> <20051005171230.GA10204@osiris.ibm.com> <1128532809.26009.39.camel@localhost> <20051005174542.GB10204@osiris.ibm.com> Content-Type: text/plain Date: Wed, 05 Oct 2005 10:57:34 -0700 Message-Id: <1128535054.26009.53.camel@localhost> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Heiko Carstens Cc: linux-mm , Bob Picco List-ID: On Wed, 2005-10-05 at 19:45 +0200, Heiko Carstens wrote: > > > Anything specific you need to know about the memory layout? > > How sparse is it? How few present pages can be there be in a worst-case > > physical area? > > Worst case that is already currently valid is that you can have 1 MB > segments whereever you want in address space. ... > Even though it's currently not possible to define memory segments above > 1TB, this limit is likely to go away. Go away, or get moved up? ia64 today is designed to work with 50 bits of physical address space, and 30 bit sections. That's exactly the same scale that you're talking about with 1MB sections and 1TB of physical space. So, sparsemem extreme should be perfectly fine for that case (that's explicitly what it was designed for). How much bigger than 1TB will it go? -- Dave -- 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