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Date: Wed, 12 Apr 2006 10:55:58 +0400
From: Kirill Korotaev <dev@sw.ru>
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To: Andi Kleen <ak@suse.de>
CC: Kir Kolyshkin <kir@openvz.org>, akpm@osdl.org,
       Nick Piggin <nickpiggin@yahoo.com.au>, sam@vilain.net,
       linux-kernel@vger.kernel.org,
       "Eric W. Biederman" <ebiederm@xmission.com>, serue@us.ibm.com,
       Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>, herbert@13thfloor.at
Subject: Re: [Devel] Re: [RFC] Virtualization steps
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>>Moreover, in OpenVZ live migration allows to migrate 32bit VPSs
>>between i686 and x86-64 Linux machines.

> How would that work when x86-64 32bit programs have 4GB of address
> space and native on i386 programs only 3GB?
we limit address space of i386 apps on x86-64 to 3GB due to 
compatibility issues - some applications don't work with not 3:1 GB VM 
split.

On the other hand if you need 4GB addr space for user you can use 4GB 
x8664 and 4gb split on i386.

Thanks,
Kirill