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

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 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:


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

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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