[CentOS] [OT] Memory Models and Multi/Virtual-Cores -- WAS: 4.0 -> 4.1 update failing

[Bryan J. Smith]

On Fri, 2005-06-24 at 07:42 -0500, Bryan J. Smith wrote:
> I'll find it.  It was from a gentlemen from AMD that discussed it in a
> thread right after Intel announced EM64T.  Linus & co. were talking
> about how EM64T is still using a 32-bit platform underneath.  The AMD
> gentlemen commented how they a few vendors had a BIOS option "Linux" for
> the memory access, and the Linux kernel could support linear addressing
> above 4GB.

Ack, it doesn't appear to be directly in the 2004Feb17 thread:  
  http://kerneltrap.org/node/2466  

There are a few comments on how the Athlon differs from Intel because of
the Alpha EV6, but not the more technical detail I was referring to.

Again, to get this "mode" you have to:  
a)  Tell the BIOS to enable a "Linux" memory mode
b)  Have a Linux kernel (Linux/x86-64 I believe?) that supports it

Yes, that's a modification of the Linux/x86-64 kernel running on a "32-
bit" Athlon, because it offers the extended, linear memory addressing
and other memory management.

BTW, the official name for Intel EM64T products _are_ IA-32e for a
number of reason.  ;-ppp


-- 
Bryan J. Smith                                     b.j.smith at ieee.org 
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