[ovirt-users] feedback and questions about SR-IOV feature

[Nathanaël Blanchet]

Hello,

My new 10G NICS support now SR-IOV, and I've played with this new 
feature as passthrough device, so as to reduce my host CPU consumption.

At the origin, I set up a bond on both 10G PF nics.

After many configurations, the only way I manage to use a VF into a VM, 
is to get out of the bond one nic.

So does it mean that it is impossible to run a VM with VF with PF 
attached to a bond?

Moreover, something strange happens : during the boot of the VM, the 
passthrough device gets an dhcp IP on the native vlan of the bond, and 
once finally up, the real vlan used by this device is on the different 
predifined vlan. It implies to me to reconfigure the network to ping 
something on the wanted vlan. Really crazy.

Other question is : In which case can it be useful to be able to bond 2 
VF? UI let us to do so, but it is impossible to add any bridge on that 
virtual bond.

Comparing to a large number of restrictions (migration and others), my 
opinion is that this feature seems to be very difficult to use in 
production...

-- 
Nathanaël Blanchet

Supervision réseau
Pôle Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5 	
Tél. 33 (0)4 67 54 84 55
Fax  33 (0)4 67 54 84 14
blanchet at abes.fr

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