There is a reason why they call it IA-32. The 36 bit stuff is an
afterthought. There are significant limitations on memory above 4GB, least of
which being 4MB pages. How about IO out of that region? Difficult to say the
least. Addressing more than 4GB of memory by an application transparently is
also difficult. How about we wait for Merced? How about using Alpha or Sparc
instead?
Alan Cox wrote:
> > Any particular reasons why? With 36-bit addressing and 3-level page
> > tables, there's no technical reason why Linux won't eventually be able
> > to address that much memory on Intel.
>
> "Eventually" doesnt equal production availability right now.
>
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