From owner-freebsd-amd64@FreeBSD.ORG  Tue Jan 25 15:09:23 2005
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Date: Tue, 25 Jan 2005 07:09:22 -0800
From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: "O. Hartmann" <ohartman@uni-mainz.de>
Message-ID: <20050125150922.GA76678@troutmask.apl.washington.edu>
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cc: freebsd-amd64@freebsd.org
Subject: Re: FreeBSD 5.X/AMD64: Linuxulator 64/32 Bit?
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On Tue, Jan 25, 2005 at 02:06:10PM +0100, O. Hartmann wrote:
> I have a simple, maybe obsolete, question.
> In kernel config templates (GENERIC) for FreeBSD 5.3/AMD64 I found some
> compatibility options, namely
> 
> options         COMPAT_LINUX32
> options         COMPAT_IA32
> (options         COMPAT_43)
> 
> The system I wish to setup is a Athlon64 3200+ system. Software is to be
> compiled when needed as it comes out of the ports collection.
> 
> If I avoid the above mentioned compatibility options, is the Linuxulator 
> in AMD64-FreeBSD 64Bit like x86_64 Linux?

No.

> Assumed, I will enable IA32 compatibility, has this some performance 
> penalties to a system running nativ 64Bit software?

No.

-- 
Steve