[ovirt-users] cpu QoS doesn't work

Hello, I set cpu QoS as 10 and applied it to VM on oVirt 4.2, but it doesn't seem to work. compared to VM without QoS, there wasn't any difference in cpu usage. Also, there wasn't any <period>...</period> or <quota>...</quota> field related to QoS in libvirt file. is it right result?? Thanks,