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[Xen-devel] unstable network trouble

  • To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Gerd Knorr <kraxel@xxxxxxx>
  • Date: Thu, 27 Oct 2005 15:57:50 +0200
  • Delivery-date: Thu, 27 Oct 2005 13:55:03 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>


With current unstable (hg7500) I have the problem that networking for domU's doesn't work reliable. Seems to be more or less random, havn't seen any pattern yet, sometimes it works normally and sometimes it doesn't.

In case it does _not_ work it looks like this (domain 1 runs fine, domain 3 is broken):

The xen-backend device is present in sysfs:

  master-xen root ~# ls /sys/devices/xen-backend
  .  ..  vbd-1-768  vbd-1-832  vbd-3-51712  vif-1-0  vif-3-0

The vif network interface is missing:

  master-xen root ~# ip link ls | grep vif
  3: vif0.0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue
  6: vif1.0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue

/etc/xen/scripts/vif-bridge is not called according to /var/log/messages:

  master-xen root /var/log# grep vif-bridge /var/log/messages
Oct 27 15:22:50 master-xen logger: /etc/xen/scripts/vif-bridge: up XENBUS_PATH=backend/vif/1/0

The backend entries in xenstore look just fine:

master-xen root ~# xenstore-dump backend/vif
        bridge           xenbr0
        mac              aa:00:57:4f:25:a7
        handle           0
        script           /etc/xen/scripts/vif-bridge
        frontend-id      1
        domain           debian
        frontend         /local/domain/1/device/vif/0
        bridge           xenbr0
        mac              aa:00:ca:d7:83:e1
        handle           0
        script           /etc/xen/scripts/vif-bridge
        frontend-id      3
        domain           gentoo
        frontend         /local/domain/3/device/vif/0

ideas anyone?



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