Re: [gentoo-user] WHAT IS Gentoo architecture for Pentium4 Prescott-2M

[Statux]

[Pardon me if I've botched any information. Comments follow.]

On Sun, 2006-12-17 at 23:04 +0300, Andrew Gaydenko wrote:
> Hi!
>
> What is Gentoo architecture for this CPU? -
>
> Pentium4 630 (3.00ГГц, 2МБ, 800МГц, EM64T) Socket775, Prescott-2M core.

If you want to use EM64T, it's amd64 and -march=nocona in the CFLAGS. Do
a little research about the available amd64 profiles. Some allow for a
pure 64bit system and some allow for both 64bit and 32bit binaries to be
used (I think it's called multilib). I tried using EM64T with my 531 but
ran into an issue with the X server crashing out and causing a system
reboot on exit. I didn't really have the patience or the need for EM64T
functionality (it was just for fun at the time) so I went back to a
32bit setup using x86 and -march=prescott

>
> I have not found here (http://gentoo-wiki.com/Safe_Cflags) this CPU core.
> For Prescott it is 'x86'. For some CPUs with EM64T it is 'amd64'. Where
> is a truth? :-)

So far, it's amd64 for EM64T. x86 is 32bit. Prescott is 32bit.

>
> If the answer is 'amd64' - there are two additional question:
>
> - does it mean all modern Intell CPUs has 'amd64' architecture? They all
>   have EM64T.

amd64 is used simply because it has everything needed to make EM64T
work. amd64 is more or less a 64bit x86-compatible architecture and is
adequate for a stable EM64T system as long as you use -march=nocona in
the CFLAGS or else you won't end up really using EM64T. Nocona is 64bit
and if you want 64bit you just call your prescott a nocona and voila -
for the most part.

>
> - [OT] which CPU core is better? Pentium4/Prescott-2M or Pentium D 9xx? Say,
>   L2 cache is 2MB and 2MB*2 respectively.

Pentium D is better. 2 CPU cores.

> Thanks in advance!
> Andrew

-- 
Statux <statux@×××××××××.net>