debug: 0.701
device: 0.698
vnc: 0.521
performance: 0.473
graphic: 0.457
boot: 0.383
PID: 0.361
files: 0.343
KVM: 0.271
socket: 0.213
other: 0.153
permissions: 0.123
network: 0.077
semantic: 0.074

xv6 kernel problem in single step mode