RE: [Xen-users] Network Bridge Fails After 3.1.3 -> 3.2.1 Upgrade

["James Dingwall" <james.dingwall@xxxxxxxxxx>]

James Dingwall wrote:
> The output from the Gentoo created bridge (brctl show, ip show link)
> bridge name     bridge id               STP enabled     interfaces
> breth0          8000.00e0812be348       no              eth0
>
> 15: breth0: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue
>     link/ether 00:e0:81:2b:e3:48 brd ff:ff:ff:ff:ff:ff
>
>   
In this scenario :
- your eth0 should be up, no ip address
- breth0 should be up, have an ip address (optional, if your dom0 needs
it)

in your example it seems like breth0 is missing an ip address. Is this 
intentional? What are the relevant entries in syslog when the bridge 
stops working? What is the status of eth0 (up, ip address?)


The IP for the bridge is assigned correctly.  The bridge functions
correctly at boot (I can ssh in to domU) and then dies after some time.
My logs show successful NFS mounts of a dom0 export for ~9 hours before
it stops.

James




> and the Xen created
>
> bridge name     bridge id               STP enabled     interfaces
> xenbr0          8000.feffffffffff       no              vif0.0
>                                                         peth0
>
> 15: xenbr0: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc noqueue
>     link/ether fe:ff:ff:ff:ff:ff brd ff:ff:ff:ff:ff:ff
>
>
> The differences that I see are in the bridge id and that the Xen
bridge
> as NOARP in the link.  Would either of these differences explain the
> behaviour I see?
>
> Thanks,
> James
>
>
>
> I'm running a Gentoo system using the 2.6.21-xen sources available in
> portage.  The system has run reliably with 3.0 and 3.1 versions of Xen
> but now trying to upgrade to 3.2 I am facing some problems.  I am
> letting Xen control the creation of the network bridge and this
happens
> without a problem and when I start domUs they initially work without a
> problem.  Unfortunately after a short time networking to the domU
fails,
> dom0 remains ok.  I have a broadcom network interface which is built
on
> to the motherboard, ethtool -i reports:
>
> driver: tg3
> version: 3.75.2
> firmware-version: 5703-v2.33
> bus-info: 0000:02:09.0
>
> I have seen reports of issues with broadcom interfaces not working and
> that ethtool -K tx off rx off resolves them but this does not work in
my
> case.  Any suggestions on things to look at are welcome, let me know
if
> any more information is required.
>
> # ethtool -k peth0
> Offload parameters for peth0:
> Cannot get device udp large send offload settings: Operation not
> supported
> rx-checksumming: on
> tx-checksumming: on
> scatter-gather: on
> tcp segmentation offload: off
> udp fragmentation offload: off
> generic segmentation offload: off
>
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