Re: [Xen-users] Bridging works fine under KVM but not Xen

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2014-01-10 at 08:58 -0600, Glenn E. Bailey III wrote:
> On Fri, Jan 10, 2014 at 4:19 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > "expected" means that vif3.X-emu remained and the device you saw in
> > guest was now emulated rather than PV. (you can inspect which with
> > ethtool -i <dev>)
> 
> Correct, both the -emu interface was there and the guest OS was using
> the e1000 module instead of the vif module.
> 
> >> > I think now is a good time for you to post your guest dmesg logs. It
> >> > will probably also be useful to see the output of "xenstore-ls -fp".
> >>
> >> xenstore-ls -fp: http://pastebin.com/phJ023vZ
> >> dmesg from guest (back with pvhvm config): http://pastebin.com/5tQ220B2
> >
> > Those show that the device is being detect and is connected (state = 4
> > in xenstore) according to both the front and backends.
> 
> Correct, the device in the guest is up/running and seeing all the arp
> traffic when I do a tcpdump. I can also ping the host machine, I just
> can't ping past it.
> 
> > What is the physical NIC in the host?
> 
> Cisco VIC running on a blade in a USC chassis.

Is that some sort of virtual NIC?

Is it possible that the chassis needs teaching about the guest MAC
address in order to allow it to propagate?

> > It might be worth playing with disabling the various offloads
> > (scatter-gather, tx-/rx-checksum, tso, gso, gro etc) on the various
> > devices. The settings can be inspected with "ethtool -k <dev>" and set
> > with "ethtool -K <dev> <thing> off". Device worth trying this on are the
> > physical NIC (eth* in the dom0) the vif devices in dom0 and the eth* in
> > domU.
> >
> > I'd start by turning them all off everywhere (including the bridge for
> > good measure) and if that works then trying various subsets to narrow it
> > down.
> 
> Ran it on eth0 and xenbr0 on the host machine and on eth0 on the guest
> OS w/no change in the results.



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