thanks Kame, 1) the policy of my process(test) is indeed SCHED_NORMAL . When I use sched_setscheduler() to set the pid sched policy to SCHED_FIFO then the cpu usage via cgroup rt_runtime_us and rt_period_us is affected . Still the ratio I specified is 1:10 but I see via top that my process ,that gets 1 cpu ,shows 20% usage 2) What about memory and cpuset subsystems of cgroup. Do their settings apply also only in the cases of processes with policy = SCHED_FIFO/SCHED_RR ? 3) lastly: What is the meaning of the ‘cap’ parameter in the schedinfo virsh command (what are the units and range of values ) and what is the ‘weigth’ parameter .I did not find any documentation of libvirt about it ? thanks Zvi Dubitzky Email:dubi@il.ibm.com