NIC type (rtl vs virtio)

[Pádraig Brady]

On 11/19/2012 03:23 PM, Nux! wrote:
> On 19.11.2012 14:56, Pádraig Brady wrote:
>> On 11/18/2012 08:22 PM, Nux! wrote:
>>> Hi,
>>>
>>> I notice the VMs are not using the virtio type NICs, but some "Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+".
>>> In my experience the virtio device is quite stable, any reason why it's not default? I see that for block device virtio is default.
>>
>>
>> This is something we should look at changing by default I think.
>> There have are some kernel bugs precluding this:
>> https://bugzilla.kernel.org/show_bug.cgi?id=42829
>> But Red Hat based kernels should be good in this area.
>>
>> It seems like it's a big global flag in nova.conf currently:
>>   libvirt_use_virtio_for_bridges = True
>> Ideally that would be a property of the guest image,
>> i.e. a tag in glance or something.
>>
>> thanks,
>> Pádraig.
>
> Thanks Pádraig, that worked!
>
> Indeed I understand virtio_net is not default due to some ubuntu kernel bugs or such like.

Also it needs guest support, so for widest range of guest support
I suppose we couldn't change the global default.

Also for installations with very disparate guest images,
the per image attributes would be needed, and
allow more tuned config.

thanks,
Pádraig.