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

To: Mauro <mrsanna1@xxxxxxxxx>
Subject: Re: [Xen-users] streaming server on a virtual machine.
From: Grant McWilliams <grantmasterflash@xxxxxxxxx>
Date: Sun, 27 Sep 2009 07:19:43 -0700
Cc: Jeff Sturm <jeff.sturm@xxxxxxxxxx>, xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
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On Sat, Sep 26, 2009 at 10:56 AM, Mauro <mrsanna1@xxxxxxxxx> wrote:

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?

Assigning a different NIC to it resolves the problem. Sending traffic out and back into the
same machine seems to be fine. If you look at the Xen architecture it all makes sense. There
an amazing number of steps between each DomU that packets have to go through. There are fewer
between the DomU and an external switch. I've not rerun the test since 3.2 but have no reason
to believe things have changed.

Grant McWiliams
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