Memory offset in DomUs

[Huffen Doback]

I'm running Xen-3.0 on CentOs 5.7 x86_64.  When I run *free -tm* in a DomU
the total amount of RAM is never what's defined in the vm .cfg.  In some
OS's *free* reports less than what's configured, and in others it reports
that there's more. What can I do to make the vm report the correct amount
of RAM that's been allocated for it?