[CentOS] [OT] Memory Models and Multi/Virtual-Cores -- WAS: 4.0 -> 4.1 update failing
Feizhou
feizhou at graffiti.net
Fri Jun 24 13:59:36 UTC 2005
Bryan J. Smith wrote:
>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.
>
>
http://marc.theaimsgroup.com/?l=linux-kernel&m=107759901509280&w=2
The Linux option in bios is mentioned here.
>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.
>
>
http://marc.theaimsgroup.com/?l=linux-kernel&m=107757492125437&w=2
I think what Bryan here is talking about is called IOMMU by the kernel guys.
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