Subject: 32bit Guests on 64bit Host
From: Oliver Welter <mail@oliwel.de>
Date: Sun, 20 Dec 2009 13:25:04 +0100

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Hi All,

anybody can tell me, if there are drawbacks/issues, running 32bit
systems on top of a 64bit host?

I am currently running debian etch with a self compiled 2.6.22-vs2.2.0.7
x86_64 on a 64bit Dual Athlon with 16GB of RAM.
At the moment I have 64bit guests (gentoo) running on it but for some
reasons* I am overthinking to downgrade the guests to 32bit.

Main question is, whats about the 4GB Memory issue?
I assume each guest can address only 4GB of memory but will the guest
spread the 4 Gigs across the available address space?

*Reason: First, I have still several 32bit host nodes so it would be
simpler for me to maintain my guest images. Second: It seems that
espacially php is eating memory on 64bit systems without any earnings.

best regards

Oliver

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