[gentoo-user] compiling gentoo on P4 for a PII

[gentoo-user] compiling gentoo on P4 for a PII

[Selso DaSilva]

Hi I m with a non-profit organization call Community Free Software
Group, Inc. (CFSG)
http://cfsg.org .  Debian is currently our distro of choice. I was
playing around with
installing gentoo, when I started to ponder. Our organization get a
lot of PII and some PIII donated to us.  Is their a way to have gentoo
installed on a P4 but compiling for the PII/PIII. Then remove the HD
from the P4 and place it in the PII/PIII system.

What would be a way to accomplish this?

Thanks
Selso
Community Free Software Group, Inc
New York
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Re: [gentoo-user] compiling gentoo on P4 for a PII

[Boyd Stephen Smith Jr.]

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On Thursday 12 October 2006 12:34, "Selso DaSilva" <selsok@gmail.com> wrote 
about '[gentoo-user] compiling gentoo on P4 for a PII':
> Is their a way to have gentoo
> installed on a P4 but compiling for the PII/PIII?

The -march= value in your CFLAGS (on the machine building the image / 
packages / binaries ) should be the lowest common denominator for any CPU 
that will run the compiled binaries / install the built packages / receive 
the imaged HD.  While the code generated under -march=pentium-4 might run 
on a PII, it's not guaranteed.  Of course, CHOST should also be set to the 
common denominator but everything Intel above and including the PII is 
686.

You can use a -mtune= value in your CFLAGS to optimize intruction 
scheduling for a particular processor, generally the most common in 
your "fleet".  The code generated under -mtune=pentium-4 will run on a 
PII.  -mtune may make scheduling decisions that adversely affect 
performance on processors other than the one specified to improve 
performance on the chosen processor.

-- 
"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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