Xen users - Jul 2007 - proper ram/swap partition size for a non-X dom0?

i am planning to setup a xen-server on a system with 8G
of RAM.  As the base system i am installing Ubuntu 7.04 Server.
the base ubuntu-server install will become the dom0 after
installing xen.  On previous installs on systems with 1G of ram,
ubuntu sets up a 3G swap space, 3x times the amount of ram.
I am affraid with the 8G system it will setup a 24G swap partition.

what would be a proper amount of ram and swap partition allocation
for a dom0 with no X?

TIA,
Tomoki

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