Date: Thu, 17 Nov 2005 14:27:34 -0600 From: Dan Nelson <dnelson@allantgroup.com> To: Chuck Swiger <cswiger@mac.com> Cc: "Marc G. Fournier" <scrappy@hub.org>, freebsd-questions@freebsd.org Subject: Re: EM64T supported? Message-ID: <20051117202734.GF62141@dan.emsphone.com> In-Reply-To: <437CE254.3080701@mac.com> References: <20051117150323.U1019@ganymede.hub.org> <437CE254.3080701@mac.com>
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In the last episode (Nov 17), Chuck Swiger said: > 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. PAE/PAE36, right? Note that if you enable PAE, some drivers may not be available. See the PAE kernel config file for a list. -- Dan Nelson dnelson@allantgroup.com
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