Hi all, When I created a virtual machine using virDomainCreateXML, with virtualport type was openvswitch, and virtual machine creation failed. The error message is: internal error: Child process (/sbin/tc filter add dev vnet110 parent ffff: protocol all u32 match u32 0 0 police rate 0kbps burst 0kb mtu 64kb drop flowid :1) unexpected exit status 2: RTNETLINK answers: Invalid argument The Domain XML file the <interface> section like this: I looked at the system log and it looked like an ovs port problem. However, when I use "tc" to manage "vnet*" of an existing virtual machine, it still returns the same error. root@ubuntu-24:~# /sbin/tc filter add dev vnet83 parent ffff: protocol all u32 match u32 0 0 police rate 0kbps burst 0kb mtu 64kb drop flowid :1 RTNETLINK answers: Invalid argument We have an error talking to the kernel Is there any reason for this problem? Thank you very much. Below some information about my machine: libvirt version: 3.4.0 ovs_version: "2.8.90" root@ubuntu-24:~# uname -a Linux ubuntu-24 4.4.0-62-generic #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux