i haven't do something in queuing,queuing runing in cpu 9%

ros strategy just pcc,when i see the cpu runing,i can see this:
[admin@rosServer] > tool profile cpu=3
NAME CPU USAGE
pppoe 3 1%
ppp 3 1%
ethernet 3 1%
firewall 3 13.5%
management 3 0%
idle 3 70%
queuing 3 11.5%
routing 3 0%
bridging 3 1.5%
unclassified 3 0.5%

in the queues,i never do something in it.
someone know it???