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Re: [Xen-devel] 4Gb memory limit circumventable?

To: Nuutti Kotivuori <naked@xxxxxx>
Subject: Re: [Xen-devel] 4Gb memory limit circumventable?
From: Rik van Riel <riel@xxxxxxxxxx>
Date: Mon, 29 Nov 2004 09:09:28 -0500 (EST)
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On Mon, 29 Nov 2004, Nuutti Kotivuori wrote:

In short - what would be the easiest approach to supporting more than 4Gb of physical memory in Xen and how much work would you estimate it to be?

Xen and the OSes you run as guests both need to have the
architecture support for PAE mode.  A lot of the needed
code can be cut'n'pasted from linux/include/asm-i386 and
linux/arch/i386 so it should probably be about a month of
work.  Maybe less for somebody familiar with the internals
of both Xen and the architecture dependant code in Linux.

"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan

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