Re: NIC type (rtl vs virtio)

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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.
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