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

  • To: "xen mailing list" <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: aschiefer@xxxxxx
  • Date: Thu, 02 Mar 2006 23:45:34 +0100
  • Delivery-date: Thu, 02 Mar 2006 22:46:05 +0000
  • List-id: Xen user discussion <xen-users.lists.xensource.com>


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 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-"
ramdisk = "/vm_kernel/xen3-modules-"
root ="/dev/hda1"
memory =1800
disk = ['phy:/dev/VM_VOLS/VM_MAXDB,hda1,w']
vif = [ 'mac=00:10:00:00:00:30' ]

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?


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