[libvirt] tc ingress rule of VM B disappear when reboot VM A

[Michal Privoznik]

On 20.07.2015 10:43, ychen wrote:
> hi:
> when I use openstack devstack to test QOS, wired phenomenon appeared, 
> I set qos ingress rule in tapB, but when I reboot tapA, the ingress rule of tapB automatically removed, but the egress rule is still exist.
> Test enviroment:
> Linux: ubuntu 14.04.1 LTS
> kernel: 3.13.0-32-generic
> libvirt: 1.2.2
> openstack: havana
> 
> 
> 1. use nova to create vm A and vm B. for the configuration of the libvirt xml, see the last paragraph in the end.
> 2. use tc cmd to create qos rule for vm A and vm B
>    tc qdisc add dev tap3d0d2c4a-0b ingress  //vmA
>    tc qdisc add dev tap896d5066-69 ingress //vmB
> 
> 
> 3. then use cmd 
>   "sudo virsh destory 142a08db-6e25-4a03-be13-7073104b0745 "  to first shutdown vm1
>   then I see ingress rule of vmB disappeared :(     
> 

Interesting. With the latest libvirt I am unable to reproduce - there's
a check and QoS is cleared out only if set in domain XML. Since your
domain XML lacks it, I guess it's either already fixed or not libvirt fault.

Michal