Messages in this thread | | | From | Gerrit Huizenga <> | Subject | Re: [Lse-tech] Re: maximum possible memory limit .. | Date | Mon, 28 Apr 2003 11:31:04 -0700 |
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On Mon, 28 Apr 2003 10:53:53 PDT, David Mosberger wrote: > >>>>> 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
0x400 is just one more bit, albeit slid around a byte or two. ;)
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