Re: [Qemu-devel] net packet storms with multiple NICs

Anthony Liguori
2009-11-11T01:38:45Z

Mark McLoughlin wrote:
> On Fri, 2009-10-23 at 20:25 +0400, Michael Tokarev wrote:
>
>> I've two questions:
>>
>> o what's the intended usage of all-vlan-equal case, when kvm (or qemu)
>> reflects packets from one interface to another? It's what bridge
>> in linux is for, I think.
>>
>
> I don't think it's necessarily an intended use-case for the vlan feature
>
>
>> o why different -net guest -net host pairs are not getting different
>> vlan= indexes by default, to stop the above-mentioned packet
>> storms right away? I think it's a wise default to assign different
>> pairs to different vlans, by counting -net host and -net guest
>> sequences.
>>
>
> With 0.12, we're going to be de-emphasising the vlan feature and instead
> have NICs directly connected to host backends. The vlan feature will be
> just another host backend, but optional
>
> You'll start guests with e.g.:
>
> -netdev tap,id=tap.0 -device virtio-net-pci,netdev=tap.0
>

Which is not necessarily more friendly to a user, but it lays the
foundation to be able to do a config file which in turns could be easily
generated from a nic GUI/command line tool.

Regards,

Anthony Liguori