[ovirt-users] R: Re: Network instability after upgrade 3.6.0 -> 3.6.1

[Stefano Danzi]

Il 06/01/2016 7.45, Dan Kenigsberg ha scritto:
> On Mon, Jan 04, 2016 at 01:54:37PM +0200, Dan Kenigsberg wrote:
>> On Mon, Jan 04, 2016 at 12:31:38PM +0100, Stefano Danzi wrote:
>>> I did some tests:
>>>
>>> kernel-3.10.0-327.3.1.el7.x86_64 -> bond mode 4 doesn't work (if I detach
>>> one network cable the network is stable)
>>> kernel-3.10.0-229.20.1.el7.x86_64 -> bond mode 4 works fine
>> Would you be kind to file a kernel bug in bugzilla.redhat.com?
>> Summarize the information from this thread (e.g. your ifcfgs and in what
>> way does mode 4 doesn't work).
>>
>> To get the bug solved quickly we'd better find paying RHEL7 customer
>> subscribing to it. But I'll try to push from my direction.
> Stefano has been kind to open
>
>      Bug 1295423 - Unstable network link using bond mode = 4
>      https://bugzilla.redhat.com/show_bug.cgi?id=1295423
>
> which we fail to reproduce on our own lab. I'd be pleased if anybody who
> experiences it, and their networking config to the bug (if it is
> different). Can you also lay out your switch's hardware and
> configuration?
>

I made some tests using kernel  3.10.0-327.4.4.el7.x86_64.
I did a TCP dump on virtual interface "DMZ" (VLAN X on bond0).

When I have two netwok cables connected I can se ARP requests but not ARP replyes.
When I detach one network cable I can see ARP requests and ARP replyes (and networking on VM works).

Maybe the problem isn't in bonding config but in qemu/kvm/vhost_net....