Re: [Xen-users] DomU ethernet speed?

To:	"Javier Guerra" <javier@xxxxxxxxxxx>
Subject:	Re: [Xen-users] DomU ethernet speed?
From:	"Emre Erenoglu" <erenoglu@xxxxxxxxx>
Date:	Wed, 20 Aug 2008 23:27:27 +0200
Cc:	xen-users@xxxxxxxxxxxxxxxxxxx, Simon Gottschlag <simon@xxxxxxxxxxxxx>
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You can try to use unmodified_drivers (ie Paravirtual drivers) on your guest kernel. That will give much better performance compared to an emulated NIC.

Emre

On Wed, Aug 20, 2008 at 10:44 PM, Javier Guerra <javier@xxxxxxxxxxx> wrote:

On Wed, Aug 20, 2008 at 3:34 PM, Simon Gottschlag <simon@xxxxxxxxxxxxx> wrote:
> So it just depends on the physical card?

no, it's totally detached from the card.

what the DomU sees and the hypervisor manages goes only to the Dom0.
there usually it's routed/NAT'ed/bridged to some physical card, but
that's not DomU's business.

> It's just that I've been experiencing that it takes longer time to load
> rar-archives etc via samba and transferring files from my server now when
> it's a virtual machine. It's still the same hardware, just that I've made it
> into a domU.
> Is this just something in my head or is it really going slower?

usually virtual machines are slower than bare metal. how much slower
depends on lots of factors. (maybe 5% slower, maybe 400% or more)

--
Javier

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Emre

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Re: [Xen-users] DomU ethernet speed?