[Xen-users] Xen3: Network becomes unreachable under load

[aschiefer@xxxxxx]

Hello,

we have the problem: We run 7 blades with a xen 3.0.1tha3 configuration  
(with the patches for debian from debianbase.de), which a is xenisied  
2.6.12.6-kernel. Everything runs fine until we start producing heavy load  
on the network (e.g. multiple clients access our maxdb database), the dom0  
and the domU network becomes unreachable (i.e. only every 100th-200th ping  
gets through). The dom0 network is a standard xen3 network on a broadcom  
tg3 eth0. For the domU we are using following script:
name ="vm_maxdb"
kernel = "/vm_kernel/xen-linux-2.6.12.6-xenu1"
ramdisk = "/vm_kernel/xen3-modules-2.6.12.6-xenu1"
root ="/dev/hda1"
memory =1800
disk = ['phy:/dev/VM_VOLS/VM_MAXDB,hda1,w']
vif = [ 'mac=00:10:00:00:00:30' ]
vcpus=4
cpus="0-3"

To get this working we also had to turn off tcp checksum offloading within  
the domU with ethtool. Btw. the problem seems to affect the connected  
switches as well as their web-managment interfaces become unavailable as  
well.
Any suggestions how to avoid this problem?

Thanks,
Artur

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