Xen users - Aug 2005 - networking is slow/fails for more than one domU

Up to now I''ve been using only one domU and networking has been fine. 
Now
I''m trying to use several domUs simultaneously (up to 14) and having
many
networking problems.  In particular I''d like to fire off commands on
all the
domUs at the same time (or at least within a couple seconds).  Even something
as simple as:

ssh dom1 hostname &
ssh dom2 hostname &

behaves poorly.  Typically one of the commands returns immediately, while the
other takes 10 seconds.  If I do several of these, some will not finish and
return a "Connection closed" message.  The pattern of which domU
connections
are slow or fail is not repeatable.  Each of the domUs is fast when it is the
only one being used.  If I use "ssh -o ConnectionAttempts=10 ..." then
some
of the connections will work after a few _minutes_.

This happens when the above is run both from a separate native Linux box
(directly connected with a gigE crossover) and dom0.  It also happens under
both SuSE 9.3 running Xen 2.0.5c and Fedora Core 4 running Xen unstable.
Even ping loses packets when I switch from pinging one domU to another.

Is this related to the "networking bug" that''s been referred
to on the lists?
I thought that was just for Xen unstable.  Is there a workaround, or some fix
that I should have made to my network configuration?

Jeff

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