From owner-freebsd-questions@FreeBSD.ORG Thu Nov 17 20:28:51 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 70F3516A420 for ; Thu, 17 Nov 2005 20:28:51 +0000 (GMT) (envelope-from chad@shire.net) Received: from hobbiton.shire.net (hobbiton.shire.net [166.70.252.250]) by mx1.FreeBSD.org (Postfix) with ESMTP id B61B443D53 for ; Thu, 17 Nov 2005 20:28:44 +0000 (GMT) (envelope-from chad@shire.net) Received: from [67.161.222.227] (helo=[192.168.99.68]) by hobbiton.shire.net with esmtpa (Exim 4.51) id 1EcqN9-000OZX-Sn; Thu, 17 Nov 2005 13:28:44 -0700 In-Reply-To: <437CE254.3080701@mac.com> References: <20051117150323.U1019@ganymede.hub.org> <437CE254.3080701@mac.com> Mime-Version: 1.0 (Apple Message framework v746.2) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: Content-Transfer-Encoding: 7bit From: "Chad Leigh -- Shire.Net LLC" Date: Thu, 17 Nov 2005 13:28:43 -0700 To: Chuck Swiger X-Mailer: Apple Mail (2.746.2) X-SA-Exim-Connect-IP: 67.161.222.227 X-SA-Exim-Mail-From: chad@shire.net X-SA-Exim-Scanned: No (on hobbiton.shire.net); SAEximRunCond expanded to false Cc: "Marc G. Fournier" , freebsd-questions@freebsd.org Subject: Re: EM64T supported? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Nov 2005 20:28:51 -0000 On Nov 17, 2005, at 1:04 PM, Chuck Swiger wrote: > Marc G. Fournier wrote: >> First off, what is it? On 32bit platforms, to address >4G of RAM, >> I recall that there is some sort of 'paging' that has to be done >> to address it ... does EM64T get around that somehow, or is this >> just another name for it? > > EM64T uses 64-bit wide registers and addressing, and can talk to > >4GB of RAM natively. Older processors may still support >4GB of > physical RAM using the PSE/PSE-36 CPU extensions, but are still > using 32-bit registers. To clarify: However, if running the x86 version (not amd64) of FreeBSD, EM64T and AMD Opteron and Athlon64 chips must use the same PSE type extensions to access > 4GB of RAM if I understand correctly Chad > > -- > -Chuck > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions- > unsubscribe@freebsd.org" --- Chad Leigh -- Shire.Net LLC Your Web App and Email hosting provider chad@shire.net