Date: Sun, 7 Jun 1998 17:00:39 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Dag-Erling Coidan =?iso-8859-1?Q?Sm=F8rgrav?= <dag-erli@ifi.uio.no> Cc: Peter Wemm <peter@netplex.com.au>, David Greenman <dg@root.com>, John Hay <jhay@mikom.csir.co.za>, cvs-committers@FreeBSD.ORG Subject: Re: cvs commit: src/sys/vm vm_kern.c Message-ID: <Pine.BSF.3.95q.980607165632.17340A-100000@herring.nlsystems.com> In-Reply-To: <xzpg1hh488l.fsf@hrotti.ifi.uio.no>
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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
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