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

[Dylan Martin <dmartin@xxxxxxxxxxxx>]

> 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 might have forgotten to use a PAE kernel, but see below.

> 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.

Ah ha! My hardware is Intel dual-core and I had panics from xvda1 too.
Sounds like a bug!  

> 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.

Mine was Fedora 7 and I had the same error.

> 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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