From owner-cvs-all Sun Jun 7 09:01:02 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id JAA20288 for cvs-all-outgoing; Sun, 7 Jun 1998 09:01:02 -0700 (PDT) (envelope-from owner-cvs-all@FreeBSD.ORG) Received: from nlsystems.com (nlsys.demon.co.uk [158.152.125.33]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id JAA20278 for ; Sun, 7 Jun 1998 09:00:55 -0700 (PDT) (envelope-from dfr@nlsystems.com) Received: from herring.nlsystems.com (herring.nlsystems.com [10.0.0.2]) by nlsystems.com (8.8.8/8.8.5) with ESMTP id RAA17358; Sun, 7 Jun 1998 17:00:39 +0100 (BST) Date: Sun, 7 Jun 1998 17:00:39 +0100 (BST) From: Doug Rabson To: Dag-Erling Coidan =?iso-8859-1?Q?Sm=F8rgrav?= cc: Peter Wemm , David Greenman , John Hay , cvs-committers@FreeBSD.ORG Subject: Re: cvs commit: src/sys/vm vm_kern.c In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Content-Transfer-Encoding: 8BIT Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk On 7 Jun 1998, Dag-Erling Coidan [iso-8859-1] Smørgrav wrote: > > If I got bc to work right, and put in the right numbers :-) then: > > 2x10^12 == 2^40.86313713864834817486 > > 4x10^12 == 2^41.86313713864834817488 > > Oh. You mean 2 TB and 4 TB :) Actually, kvm is (2^41 - 2^33). The 8G at the top of the kernel virtual address space is reserved for the magic page table recursive mapping. Also for next generation alphas (21264), I expect to support 4 level page tables which will allow 2^52 user and (2^51 - 2^43) kernel address spaces with the 8k page size. If the page size is increased to 32k, the entire 64bit address space can be covered. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 951 1891 Fax: +44 181 381 1039 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message