[gentoo-user] Which profile for EM64T setup?

[gentoo-user] Which profile for EM64T setup?

[Statux]

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I currently have a generic i686 setup on my P4 with HT and EM64T. I've
come to realize that I could be doing better so I've started considering
switching over to use EM64T (nocona). I figure that I'll be switching my
CHOST to x86_64-pc-linux-gnu and my march variable in CFLAGS to nocona
(from the i686 it's set to now), rebootstrap and then do a full
system/world rebuild but I haven't been able to find any documentation
regarding which profile I should be using. I'm currently using
default-linux/x86/2006.0 but which one might be best if I'm intending to
use a multilib setup (since I'll be wanting to avoid breaking anything)?

Aside from that, does anyone have any information/suggestions relating
to the use of EM64T in the Gentoo environment or in general?

Thanks.


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Re: [gentoo-user] Which profile for EM64T setup?

[Rumen Yotov]

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On Friday 03 March 2006 06:13, Statux wrote:
> I currently have a generic i686 setup on my P4 with HT and EM64T. I've
> come to realize that I could be doing better so I've started considering
> switching over to use EM64T (nocona). I figure that I'll be switching my
> CHOST to x86_64-pc-linux-gnu and my march variable in CFLAGS to nocona
> (from the i686 it's set to now), rebootstrap and then do a full
> system/world rebuild but I haven't been able to find any documentation
> regarding which profile I should be using. I'm currently using
> default-linux/x86/2006.0 but which one might be best if I'm intending to
> use a multilib setup (since I'll be wanting to avoid breaking anything)?
>
> Aside from that, does anyone have any information/suggestions relating
> to the use of EM64T in the Gentoo environment or in general?
>
> Thanks.
Hi,
Lacking any experience with EM64T, but just checked and there's a profile for 
ia64 (think it's the same).
Check (look at) "/usr/portage/profiles/default-linux/ia64" for a 'profile'.
PS:there's also a minimal-install-CD.2006.0 & stages for ia64.
HTH.Rumen

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Re: [gentoo-user] Which profile for EM64T setup?

[Masood Ahmed]

On 07:54 Fri 03 Mar    , Rumen Yotov wrote:
> On Friday 03 March 2006 06:13, Statux wrote:
> > I currently have a generic i686 setup on my P4 with HT and EM64T. I've
> > come to realize that I could be doing better so I've started considering
> > switching over to use EM64T (nocona). I figure that I'll be switching my
> > CHOST to x86_64-pc-linux-gnu and my march variable in CFLAGS to nocona
> > (from the i686 it's set to now), rebootstrap and then do a full
> > system/world rebuild but I haven't been able to find any documentation
> > regarding which profile I should be using. I'm currently using
> > default-linux/x86/2006.0 but which one might be best if I'm intending to
> > use a multilib setup (since I'll be wanting to avoid breaking anything)?
> >
> > Aside from that, does anyone have any information/suggestions relating
> > to the use of EM64T in the Gentoo environment or in general?
> >
> > Thanks.
> Hi,
> Lacking any experience with EM64T, but just checked and there's a profile for 
> ia64 (think it's the same).
> Check (look at) "/usr/portage/profiles/default-linux/ia64" for a 'profile'.

 I dont think ia64 is the right profile, as far as i know ia64 is for itanium
and is incompatible with x86_64 architectures. The best bet would be to use
x86 profile and define the CHOST and CFLAGS for EM64T.

> PS:there's also a minimal-install-CD.2006.0 & stages for ia64.
> HTH.Rumen

It'd be a waste of time downloading ia64 cd because it wont run of
EM64T or any other x86 systems anyway. This backward compatibility was the
major reason why Intel's 64-bit plans failed, and AMD's 64-bit plans won.

PS: I personally prefer AMD64 over EM64T, performance wise it's far better
than its intel counterpart.
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[gentoo-user] Re: Which profile for EM64T setup?

[Francesco Talamona]

On Friday 03 March 2006 05:13, Statux wrote:
> Aside from that, does anyone have any information/suggestions
> relating to the use of EM64T in the Gentoo environment or in general?

http://www.nabble.com/gentoo-on-xeon-with-64-bits-extention-t903643.html

HTH
	Francesco
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Re: [gentoo-user] Which profile for EM64T setup?

[Boyd Stephen Smith Jr.]

On Thursday 02 March 2006 22:13, Statux <statux@optonline.net> wrote about 
'[gentoo-user] Which profile for EM64T setup?':
> I currently have a generic i686 setup on my P4 with HT and EM64T. I've
> come to realize that I could be doing better so I've started considering
> switching over to use EM64T (nocona). I figure that I'll be switching my
> CHOST to x86_64-pc-linux-gnu and my march variable in CFLAGS to nocona
> (from the i686 it's set to now), rebootstrap and then do a full
> system/world rebuild but I haven't been able to find any documentation
> regarding which profile I should be using.

While you are going to have to take special care while changing from one 
CHOST to another, I just checked on gentoo-amd64 and (1) all current 
x86_64 processors are supported as of the 2006.0 amd64 profile (2) we've 
got a least two users that have been running amd64 profiles on em64t chips 
for a while and (3) the profile and arch will remain amd64, at least for 
now, since it's a PITA to change it and it has < 0 ROI.

As for which 2006.0 profile to use, I recommend for the base (multilib) and 
against no-multilib, but have not tried no-symlink.

-- 
"If there's one thing we've established over the years,
it's that the vast majority of our users don't have the slightest
clue what's best for them in terms of package stability."
-- Gentoo Developer Ciaran McCreesh
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