Messages in this thread | | | Date | Fri, 28 Oct 2005 12:19:09 +0500 | From | Fawad Lateef <> | Subject | Re: 4GB memory and Intel Dual-Core system |
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On 10/28/05, Joel Jaeggli <joelja@darkwing.uoregon.edu> wrote: > On Fri, 28 Oct 2005, Fawad Lateef wrote: > > > Can you tell me the main differences between IA64 and x86_64 (Opteron) > > IA64 is itanium - there are a lot of differences but the principle one for > your perspective is that you don't want to run x86 code on a itanium, it > has an x86 instruction decoder but you wouldn't want to use it if you > could avoid it. >
OK
> > ? because in your one of the previous mail you said IA64 != EM64T and > > emt64 getts lumped with amd64 collectivly x86_64. fundamentaly intels > implementation is compatible with amd's > > > its true, but I know is EM64T/AMD64 in 64-bit mode != IA32 but you > > said that too EM64T is not really 64-bit, its a IA32 .. Can you give > > It is ia32 except with 40 bits of real memory and 48 bits of virtual > memory and 64 bit registers. >
And a difference of memory architecture is there tooo. x86_64 in 64-bit mode implements flat memory model but IA32 uses segmentation/paging. As far as Linux Kernel is concern I know kernel won't implements segmentation in IA32 so it memory management is almost compatible with x86_64 except registers/real address /virtual addresses ...
> one article that's use for getting a start on the instruction set is here: > > http://arstechnica.com/cpu/03q1/x86-64/x86-64-1.html >
Thanks, nice link :)
> > > me some link which just tells the difference between IA64 (Itanium) > > and AMD64 (Opteron) ? > > you're not likely to care about ia64, so I think what your'e really > interested in is ia32 vs x86_64 and intel vs amd in the context of x86_64 >
Nops, I am not interested in x86_64 context of intel and amd, I rather wanted a comparison between the intel and amd server processors architecture (Itanium and Opteron).
Any ways, Thanks
-- Fawad Lateef - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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