>>>>> On Mon, 28 Apr 2003 19:13:53 +0200, Andi Kleen <ak@suse.de> said:
>> Cool. Sorry to be pestering about the 64-bit limits, but can we
>> really use 2^64 bytes of memory on ia64/ppc64/x86-64 etc.?
>> (AFAIK, 64-bit arches don't suffer from a small ZONE_LOWMEM.)
Andi> No. The hardware have far smaller physical limits.
Andi> Current AMD64 CPUs are limited to 40bit physical, 48bit virtal
Andi> (the virtual limit per process in the current Linux kernel is
Andi> 39bits)
Andi> Itanium 2 afaik support a bit more 50bits (51 or 52, I forgot)
Andi> physical, probably more virtual.
Itanium 2 supports all 64 virtual address bits and 50 physical bits
(in what way is "1024 times more" "a bit more"? ;-).
--david
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