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Re: [Xen-users] streaming server on a virtual machine.

To: Grant McWilliams <grantmasterflash@xxxxxxxxx>
Subject: Re: [Xen-users] streaming server on a virtual machine.
From: Mauro <mrsanna1@xxxxxxxxx>
Date: Sat, 26 Sep 2009 19:56:03 +0200
Cc: Jeff Sturm <jeff.sturm@xxxxxxxxxx>, xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
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2009/9/26 Grant McWilliams <grantmasterflash@xxxxxxxxx>:
> I will also add that if Xen has a bottleneck it's traffic between DomUs.
> Don't configure it in any way to have
> one DomU servicing another DomU unless both have real  network cards
> attached to them. As strange as it
> sounds I've clocked 3x speed improvement by sending the data out of the
> machine to a switch and back in
> to another DomU as apposed to sending it straight across. There's something
> messed up in that but if you follow
> this guideline you'll get wire speed out of your DomUs.

Thank you for your answer it was very exhaustive.
I've learned a new thing, that is the poor performance in traffic
between domU in the same machine rather than domU in different
I've a domU with tomcat and many jruby applications and, in the same
machine, another domU as database server with postgres.
Based on what you say I've to reconfigure my systems to have domU in
different machines.
Perhaps I can leave domU in the same machine but assign a different NIC?

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