Re: [Xen-devel] Xen3 domU network packet loss (udp iperf)

["Andrew D. Ball" <aball@xxxxxxxxxx>]

I wonder if this is why I've never seen a domU kernel finish booting 
with ip="dhcp" in the Python configuration file.
This translates to an "ip=:::::eth0:dhcp" kernel parameter, so the domU 
seems to be using the DHCP client embedded in the Linux kernel.
It always times out for me, but I haven't found time to dig deeper into 
what's going wrong.
Has anyone else had better luck?

Thanks for your help.
Andrew
=============
Andrew D. Ball <aball@xxxxxxxxxx>

Pasi Kärkkäinen wrote:
> And you won't notice this packet loss with TCP, because TCP automatically
> re-transmits the missing packets.. TCP speed does suffer, however.
>
> Others seeing this?
>
> - Pasi
>
> On Sat, Mar 18, 2006 at 03:04:13PM +0200, Pasi Kärkkäinen wrote:
>
> > Hi!
> >
> > Please check out this URL: http://nrg.joroinen.fi/xen-ploss.txt
> >
> > There you have UDP iperf results to and from domU and dom0.
> >
> > It seems xen causes packet loss to domU's.. dom0 works well without packet
> > loss.
> >
> > Is this known problem? I'm using bridged networking with xen.
> >
> > Both the xen box, and the external non-xen box were P4 3.0+ GHz, using
> > gigabit NIC's (tg3 and e1000).
> >
> > in the xen box, all the physical network interfaces (tg3) have rx and tx 
> > checksumming on.
> > I'm using xen 3 unstable from 2006-02-04.
> >
> > -- Pasi
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