[geeks] Itanium 32 bit performace.... hahahaha
Francisco Javier Mesa-Martinez
lefa at ucsc.edu
Sat Dec 20 03:25:25 CST 2003
On Wed, 10 Dec 2003, Kevin wrote:
> I've heard this before, but have never understood it. What is it
> about Alphas that requires more RAM than other processors? My Alpha
> has 256 and seems to run fine as a file server.
Alphas before the 21164A were not byte addressable, meaing that you were
wasting a lot of memory if you just needed to store a byte, since
depending on the compiler/OS you may be wasting a full word (the original
design called for a KISS approach). It made the chip very simple, since
you do not have to deal with unaligned aceesses, and of course cache is
far simplified. I.e. no need to decode a large offset for a cache line.
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