AMD Athlon64 Systems
Chris Ricker
kaboom at gatech.edu
Sat Oct 18 13:34:40 UTC 2003
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
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