Messages in this thread | | | From | David Mosberger <> | Date | Mon, 28 Apr 2003 10:53:53 -0700 | Subject | Re: [Lse-tech] Re: maximum possible memory limit .. |
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>>>>> 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"? ;-).
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