WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

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

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
> > >
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-devel
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel