From owner-freebsd-hackers Fri Aug 3 23: 0:11 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from netbank.com.br (garrincha.netbank.com.br [200.203.199.88]) by hub.freebsd.org (Postfix) with ESMTP id 8E3DA37B403 for ; Fri, 3 Aug 2001 23:00:04 -0700 (PDT) (envelope-from riel@conectiva.com.br) Received: from surriel.ddts.net (1-072.cwb-adsl.brasiltelecom.net.br [200.193.160.72]) by netbank.com.br (Postfix) with ESMTP id E20AE4680C; Sat, 4 Aug 2001 02:59:25 -0300 (BRST) Received: from localhost (ozbfdo@localhost [127.0.0.1]) by surriel.ddts.net (8.11.4/8.11.2) with ESMTP id f74602R20300; Sat, 4 Aug 2001 03:00:02 -0300 Date: Sat, 4 Aug 2001 03:00:02 -0300 (BRST) From: Rik van Riel X-X-Sender: To: Terry Lambert Cc: Julian Elischer , craig , Subject: Re: How to visit physical memory above 4G? In-Reply-To: <3B6B8EAC.B4EBD5E8@mindspring.com> Message-ID: X-spambait: aardvark@kernelnewbies.org X-spammeplease: aardvark@nl.linux.org MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, 3 Aug 2001, Terry Lambert wrote: > You still haven't told me what Linux does for 2x4G processes > and a 1G kernel with "only" 8G of physical RAM. I rather > suspect that as soon as your usage exceeds real memory, it > all goes to hell very quickly, since your L1 and L2 caches > are effectively disabled by the frequent reloading of CR3 > and CR4 on context switches... Page tables can point to pages all over memory, there is no need to use stupid segment tricks for anything. regards, Rik -- Virtual memory is like a game you can't win; However, without VM there's truly nothing to lose... http://www.surriel.com/ http://distro.conectiva.com/ Send all your spam to aardvark@nl.linux.org (spam digging piggy) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message