amd64 slower than i386 on identical AMD 64 system?
bde at zeta.org.au
Tue Mar 14 18:21:09 UTC 2006
On Mon, 13 Mar 2006, JoaoBR wrote:
> Since some time (>6.0R) I have the impression that amd64 runs slower than
> i386. Now I run some tests on identical hardware and using ubench confirmes
> this. Somebody has comments on this?
Of course 64-bit mode is slower. Many (data) objects are twice as
large, so there are more cache misses. 64-bit integer registers make
relatively little difference except in code that does lots of 64-bit
integer operations. Other features that are only available in 64-bit
mode make relatively little difference except in even more specialized
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