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

[peter_booth@xxxxxxx]

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!

Peter

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
> machines.
> 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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