Date: Thu, 17 Nov 2005 13:28:43 -0700 From: "Chad Leigh -- Shire.Net LLC" <chad@shire.net> To: Chuck Swiger <cswiger@mac.com> Cc: "Marc G. Fournier" <scrappy@hub.org>, freebsd-questions@freebsd.org Subject: Re: EM64T supported? Message-ID: <CB2C6D79-9413-44F2-815B-1DD3E87E2281@shire.net> In-Reply-To: <437CE254.3080701@mac.com> References: <20051117150323.U1019@ganymede.hub.org> <437CE254.3080701@mac.com>
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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
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