[Fedora-xen] More then 16GB with FC6 or FC7?

[Daniel P. Berrange]

On Wed, Jun 27, 2007 at 05:00:13AM -0400, thewird wrote:
> Is there any way to make the xen kernel see more then
> 16GB of ram when its installed on a 32bit OS (either
> FC6 or FC7)?

No it is an architectural limitation of Xen that 32-bit is limited to
a maximum of 16 GB, even with PAE.

> I tried FC7 64bit since it can see all the ram,
> however the only 32bit OS I was able to install
> successfully was windows XP. Every other distro (FC6,
> FC7, and CentOS 4.5 & 5.0) would freeze up at some
> point in the installation or bootup section.
> 
> I have a machine with 28GB of ram and have a month to
> get it running.

64-bit is the way to go. Try toggleing the 'acpi' and 'apic' settings
for the HVM guests as this often helps with lockups.

Dan.
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