Re: Dupal Opteron on Sarge

[Jacob Bresciani <jacob@etrafficsolutions.com>]

I would guess compared to Intel's first line of "x86" 64bit CPU's,  
the Intanium's which had a 32 bit "emulation" mode which took serious  
performance hits.

I haven't seen much on what their (Intel) new line of x86_em64 chips  
are like now though.

Jacob Bresciani


"Passwords are like bubble gum, strongest when fresh, should never be  
used by groups and create a sticky mess when left laying around"

-anon


On Sep 19, 2005, at 10:38 AM, Paul Brook wrote:

> > They can natively run 32 bit stuff with NO speed penalities
>
> No speed penalty compared to what?
>
> Amd64 chips do run 32-bit code "natively", and are competitive as  
> 32-bit CPUs
> in their own right. However you usually get a speed increase from  
> recompiling
> as a 64-bit app. In 64-bit mode you have more registers and 64-bit
> arithmetic, which allow the compiler can generate more efficient code.
>
> From what I've seen 64-bit apps tend to be ~10% faster then the 32-bit
> equivalent.
>
> Paul