device: 0.847
performance: 0.782
graphic: 0.698
network: 0.577
permissions: 0.416
PID: 0.404
semantic: 0.323
vnc: 0.227
debug: 0.173
boot: 0.155
other: 0.154
files: 0.125
KVM: 0.089
socket: 0.024

virtio only support packed ring size power of 2