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Re: Debian for x86-64 (AMD Opteron)

Le jeu 10/04/2003 à 11:40, Hamish Marson a écrit :

> Then again, it's more likely to end up SLOWER as loading 64 bit values 
> from memory into registers is going to go at half the speed of loading 
> 32 bit values, just based on bus bandwidth alone. If the system you're 
> supporting does BOTH 32 & 64 bit at the same time, then unless you need 
>  > 2GB access, 32bit is probably going to be the way to go.

AIUI, this is true for e.g. sparc64, but not for x86_64. The opteron is
not just an i386 with 64 bit registers, but has new registers and new
optimizations which make it run faster with 64 bit executables than with
32 bit ones.

 .''`.           Josselin Mouette        /\./\
: :' :           josselin.mouette@ens-lyon.org
`. `'                        joss@debian.org
  `-  Debian GNU/Linux -- The power of freedom

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