Re: [Xen-devel] what's maximum speed setting for xen network?

[Xin Zhao <zhaoxin@xxxxxxxxxxxxxx>]

Yes. I tried scp. I know CPU could be bottleneck. But I also tried ftp and
NFS, they do not have much better performance.  :) So it might be virtual
network issue.

xin


On Fri, 22 Apr 2005, Mark Williamson wrote:

> It is possible to rate limit vifs but it won't be active by default.
>
> What are you using to copy the files across?  If you're using scp, bear in
> bind that both virtual machines will have to do crypto, so you could actually
> be limited by CPU performance rather than virtual network.
>
> Also, uniprocessor systems are a worst case for this sort of test because
> you'll incur a lot of context switches.  Hyperthreading should be able to
> mitigate this somewhat.
>
> There are plans to optimise host-internal networking somewhat.
>
> Cheers,
> Mark
>
> On Friday 22 April 2005 21:14, Xin Zhao wrote:
> > I just setup network and tried to copy files between dom0 and domU. The
> > speed is around 100Mb/s. So I once thought it is simulating 100Mb network,
> > but after looking into the network driver, I failed to find anything about
> > the flow control.
> >
> > I didn't try UDP, so have no idea about UDP losses.
> >
> > Xin
> >
> > On Fri, 22 Apr 2005, mukesh agrawal wrote:
> > > > For a physical network card, it has a maximum transmission speed such
> > > > as 100Mb. How about network in a virtual machine? It is a virtual
> > > > network card. Is there any speed limit? Or it can transmit as fast as
> > > > possible? If so, I guess network transmission happened within a
> > > > physical host should be very fast (great than 100Mb). But this is not
> > > > true in my experiment.
> > >
> > > Out of curiousity, what kind of testing have you run, and what kind
> > > of speeds are you getting?
> > >
> > > I've got a configuration with DomU talking to Dom0 over a vif, and seem
> > > to be seeing UDP losses, even at low data rates. (I haven't dug into this
> > > deeply to very the problem yet, though.) So I'd be interested if you're
> > > seeing something similar.
> > >
> > > Thanks,
> > > mukesh
> > >
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