From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: xen: memory initialization/balloon fixes (#3)
Date: Fri, 23 Sep 2011 09:28:14 -0400
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> > No, the first line of /proc/meminfo is precisely "totalram_pages".
> 
> I think most of the increase in reserved memory compared to classic Xen
> kernels is the change to using the generic SWIOTLB.  This is up to 64 MiB.

Which should be disabled by default on domU... Well, unless your guest
has more than 4GB than it gets enabled.