On 08/12/2014 01:37 PM, Romain Hardouin wrote:
Hi all,
I try to understand why the interface bandwidth limits are not applied to my Ubuntu 12.04 VM (qemu-kvm driver) and I would need some insights. I spawn my VM with OpenStack and when I issue a dumpxml on my domain, I can see that bandwidth limits are set:
<interface type='ethernet'>
What is the reason for using <interface type='ethernet'> instead of type='bridge'? In general, type='ethernet' is intended to be used only as a last resort if a more supported type (pretty much anything else, except 'user') can't do what is needed. That is the reason you're not seeing the effects of the <bandwidth> element - <bandwidth> only affects interface types of 'bridge', 'network', or 'direct' (source: I just checked the code). In theory there's no reason I know of that we shouldn't make it work on type='ethernet', but due to the relative "unsupportedness" of type='ethernet', nobody has noticed before now.