[Xen-users] Failed Network

[MCresearch <mike.pk@xxxxxxxxx>]

I'm at my wits end maybe someone out there can help me.

Machine
Shuttle AN51R Motherboard
1GB ram
AMD-64 3000+ (2GHz)
20GB HD (western digital) with 1GB for minimal install, 500MB for  
swap, and the rest I had planned to use for LVM volumes for VMs.
I've been running ubuntu 5.04 (hoary) happy as a clam for a while now  
no problems. Now I've started investigating Xen and for the life of  
me I can't get it to work properly. I've done clean minimal installs  
of both Ubuntu Hoary and Debian sarge.
Everything looks like it runs ok until I log in and try to access the  
network.
The primary symptom is that the network interface doesn't work. It's  
enumerated in the bootup (Broadcom Tigon3) and tg3 is built into the  
standard binary release kernels (I'm using vmlinuz-2.6.11.12-xen0)  
but when dhclient runs it fails to get an IP address. I can bring the  
interface up and down, and it still refuses to work. I can assign it  
a manual IP address, but it still doesn't communicate on the network  
(no ping, etc). If I boot the standard (no xen) kernel, all is fine  
and the network works properly.
in dmesg (from debian) the network card is found
eth0: Tigon3 [partno(yadda yadda) rev blah blah(]
1000BaseT Ethernet XX:XX:XX:XX:XX (<---- Mac address)
eth0: RXcsums[1] etc etc etc...

What I've tried
Multiple distributions, clean installs
The standard binary Xen release kernels
Compiling my own Xen kernels
       lots of different kernel options -> with modules, without  
modules, tg3 built in, AGP on, AGP off... I can get them all to boot  
but no network.
Different kernel versions 2.4 and 2.6, same behavior
using an initrd, same behavior
booting xen.gz with
      noapic, acpi=off, watchdog all show the same "no network"  
behavior
Nothing in dmesg or syslog seem to be out of place that I can tell.
The only errors I see are regarding USB a few errors that look like
hub 1-0:1.0: Cannot enable port 3. Maybe the USB cable is bad?
-and-
usb 1-3: device descriptor read/64, error -110

and in debian dhclient output shows on boot, and you can see the  
failure to get a DHCP offer.
I really have no idea what to try next. (and everytime I go back to  
booting a "regular" kernel everything is fine again.. grrrr)
Please, any help would be *greatly* appreciated as I've become very  
frustrated with this effort.
-Mike

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