To: Vladimir Lazarenko <vlad@lazarenko.net>
Cc: thockin@hockin.org, linux-kernel@vger.kernel.org
Subject: Re: AMD Athlon64 X2 Dual-core and 4GB
References: <4361408B.60903@lazarenko.net>
	<m1irvhbqvo.fsf@ebiederm.dsl.xmission.com>
	<20051028160403.GA26286@hockin.org> <43625484.30100@lazarenko.net>
From: ebiederm@xmission.com (Eric W. Biederman)
Date: Fri, 28 Oct 2005 10:52:32 -0600
In-Reply-To: <43625484.30100@lazarenko.net> (Vladimir Lazarenko's message of
 "Fri, 28 Oct 2005 18:40:36 +0200")
Message-ID: <m11x25bn3j.fsf@ebiederm.dsl.xmission.com>
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Vladimir Lazarenko <vlad@lazarenko.net> writes:

>>>>Thus, the question - would I be able to use whole 4G RAM with dual-core amd
> and
>>>>kernel with SMP compiled for i686?
>> Why would you use a dual core AMD in 32 bit mode?  Just build an x86_64
>> kernel.
>> If you want to use 4GB in 32 bit mode, you *need* remapping (or you lose
>> part of your memory).  Remapping means you have MORE than 4 GB of physical
>> address, which means you need PAE to use it at all.
>
> Because I find my distribution's 64-bit release reasonably unstable yet? :)
>
> Or can I somehow build an x86_64 kernel and keep using 32-bit libc?

Building a x86_64 kernel is a bit of a trick on a 32bit distro.  
You need an appropriate version of gcc, and binutils.  But it runs
fine.

Eric
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