Re: [Xen-users] How to know the network limits?

[Jordi Espasa Clofent <jespasac@xxxxxxxxxxxx>]

Fajar A. Nugraha escribió:
> On Tue, Aug 4, 2009 at 9:07 PM, Jordi Espasa
> Clofent<jespasac@xxxxxxxxxxxx> wrote:
> > I answer myself:
> >
> > * the network limit (in interruptions sense) is the physical NIC limit,
> > because of all the level 2 happens in dom0.
> Is it?
> Last time I check, transfer between domU <-> dom0 (which is all on
> virtual interfaces, involving vif and bridge) on a somewhat old
> machine (an old Xeon 3.2 GHz) got me around 1-2 Gbps with 100% CPU
> usage. So when you have -- say -- a 10Gbps NIC, the physical NIC is no
> longer the limiting factor.
If you make a transfer between domU <-> dom0 you're using level 3 (IP) 
but also level 2 (LINK LAYER, localhost).
So, _in interruptions sense_ the physical limit is the physical NIC limit.

Feel free to correct me if you think my reasoning is wrong. :)

--
Thanks,
Jordi Espasa Clofent

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