Re: [Xen-users] 32 & 64 & the FAQ

[Jesper Andersen <ii1fm0ay@xxxxxx>]

On Saturday 04 August 2007, Dylan Martin wrote:
> 1) What really is 32-on-64?  From what I've read I should be able to
> run 32bit PV domUs on a 64bit dom0 with 3.1.0.  I've tried it and it
> only works with a 64 bit kernel.  What am I missing?

As it says on the wiki the 32bit PV kernel is required to have PAE. Did 
you remember that? What error did you get?

I just tried it out with dom0 64bit and domU 32bit PAE
On an AMD single core system(64 3700+) it worked just fine and it runs 32 
bit PAE and 64bit domUs at the same time.
On an Intel dual dual core system (2x5120) however the 32bit PAE kernel 
panics before mounting the root filesystem. Something about not being 
able to read superblock on xvda1.
All of the kernels are compiled from xensource 3.1 except the intel system 
which uses 2.6.20 from gentoo xen overlay. So maybe that is the problem.

And what I would like to know is which combination will perform best of 
the 2 choices of 32bit userland/64bit kernel and 32bit userland/32bit 
kernel both on a 64 bit dom0. And are there other 
advantages/disadvantages of the 2 choices.

-- 
Jesper
 20:20:52 up 1 day,  1:25, 11 users,  load average: 0.12, 0.07, 0.01

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