Re: [Xen-users] Networking with xen

["Grant McWilliams" <grantmasterflash@xxxxxxxxx>]

On Wed, Oct 15, 2008 at 11:03 AM, Quezada, Pedro <PedroQ@xxxxxxxxxx> wrote:

have you tried it from DOM to network outside of DOM

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From: Grant McWilliams [mailto:grantmasterflash@xxxxxxxxx]
Sent: Wednesday, October 15, 2008 1:13 PM
To: Quezada, Pedro
Cc: Luke S Crawford; xen-users@xxxxxxxxxxxxxxxxxxx

Subject: Re: [Xen-users] Networking with xen

On Wed, Oct 15, 2008 at 6:57 AM, Quezada, Pedro <PedroQ@xxxxxxxxxx> wrote:

So is performance throughput an issue with Xen ?

Performance isn't what you'd expect even with PV domUs. I think Iperf shows about 360Mbs between domUs. I'm not sure where the slowdown is but you'd think that we'd at least be getting gbE speeds.

Grant McWilliams

Yes. I've followed all the threads about this and everyone comes up with about the same thing. Some people have said that if you have a dedicated eth card for each VM it's much better. You can actually send data faster out of the box than to another VM. Maybe because the data has to go through the hypervisor to qemu to Linux across the bridge back to qemu, back to the hypervisor and back to the other vm. If the data is leaving the box it ony needs to go through this process once. I'm thinking that the new stubdomains will help but I've not been able to find any data to support this so far.

Grant McWilliams

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