AMD Athlon64 Systems

[Chris Ricker]

On Sat, 18 Oct 2003, Mike A. Harris wrote:

> >> What is the 32/64 bit split in Sparc linux distros? PowerPC distros?
> >
> >Aurora is 64-bit kernel, 32-bit userspace on UltraSparc
> 
> AMD64 architecture provides more benefits to general 64bit apps 
> than broken 64bit sparc processors do.  ;o)

Actually, it's the broken 32-bit mode of the AMD64 (and any other 32-bit
Intel compatible CPU) ;-)

In general, it's always going to be true that 32-bit userspace is better
than 64-bit userspace for apps that don't need to be 64-bit, simply because
you'll avoid as much cache thrashing and such. Isn't the reason that's not
true with 64-bit vs 32-bit on AMD64 is because in 32-bit, AMD64 is quite
register-starved, and the gains from additional registers in 64-bit more
than offset the losses from memory bloat?

later,
chris