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Date: Wed, 21 Jun 2006 11:48:34 -0700
From: "Nikolas Britton" <nikolas.britton@gmail.com>
To: "Nikolas Britton" <nikolas.britton@gmail.com>, 
	"Andy Reitz" <reitz@eecs.cwru.edu>, freebsd-questions@freebsd.org
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Cc: 
Subject: Re: migrating to 64-bit
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On 6/21/06, Michael P. Soulier <msoulier@digitaltorque.ca> wrote:
> On 21/06/06 Nikolas Britton said:
>
> > IA64 = Itanium, Itanium2 = FreeBSD/ia64
> > EM64T = Intel CPUs with AMD64 (P4, Xeon, etc.) = FreeBSD/amd64
> > AMD64 = Opteron, Athlon 64, Turion 64, Sempron 64 = FreeBSD/amd64
> >
> > http://en.wikipedia.org/wiki/EM64T
> >
> > Why do you need to run in 64-bit mode?
>
> I'm asking that myself. I'd like to do comparisons with and without 64-bit
> support.
>

The consensus seems to be that FreeBSD/amd64 is a tad slower then
FreeBSD/i386 because it has to deal with 32 extra bits. The primary
reason to use FreeBSD/amd64 seems to be if you need greater then 4GB
of RAM.

This should give you the speed boost your looking for:
CPUTYPE?=pentium2
CFLAGS+= -mtune=nocona
COPTFLAGS+= -mtune=nocona

Put that in /etc/make.conf and recompile ports/kern/world.


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