From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Re: 2.6.32 pvops dom0 oom when creating a domU
Date: Mon, 1 Aug 2011 23:19:25 -0400
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To: Daniel Musketa <daniel.musketa@googlemail.com>
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On Tue, Aug 02, 2011 at 01:57:53AM +0200, Daniel Musketa wrote:
> 2011/8/2 Daniel Musketa <daniel.musketa@googlemail.com>:
> > Maybe I should say more about memory usage:
> 
> I got even more detailled logs for you in the attached file:
> 
> line   3: dom0 memory: 2,560 M
> line  20: 21,637 M free
> line  34: dom0_mem=4000M
> line  47: domU memory = '2800'
> line  72: OOM begins
> line 157: key 'm' on (XEN) console

Try the 'mem=4G' in your Linux line (along with the one in your hypervisor).
The problem is that Dom0 sets up pagetables for the 32GB even thought it is never
going to use it - the 'mem=4G' should fix that for you.