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
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