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

Mauro, Grant,

Whenever innovative technology appears it seems inevitable that it is deployed in some contexts where it just doesn't fit. I remember this happening with Corba, EJBs, ibject databases, web services, etc.

If your priority is efficient use of machine resources (throughput) then Xen's flexibility is amazing. If, on the other hand, you have a customer facing retail website then using Xen might reduce both hardware costs and market share as your customers move to faster competitor sites.

Be certain that your physical architecture makes business sense!


Sent from my iPhone

On Sep 26, 2009, at 1:56 PM, Mauro <mrsanna1@xxxxxxxxx> wrote:

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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