Messages in this thread | | | Date | Mon, 16 Mar 2009 19:17:32 +0800 | From | Li Zefan <> | Subject | Re: cgroup, RT cpu balance question |
| |
Rolando Martins wrote: > Hi, > I have one question regarding RT cpu balance using cgroup. > > cgroup > echo 1 > cpuset.sched_load_balance > > cgroup/2 > echo 0 > cpuset.mems > echo 0-2 > cpuset.cpus > echo 450000 > cpu.rt_runtime_us > > cgroup/3 > echo 0 > cpuset.mems > echo 3 > cpuset.cpus > echo 450000 > cpu.rt_runtime_us > > > I have a small test that uses a loop to utilize 100% cpu (SCHED_FIFO). > When I run 2 tests on cgroup/3, it only uses bandwidth from cpu 3 > (100%), the balancing isn't happening. > As I use the SCHED_FIFO, the 2 processes run sequentially. > > Is this the expected behavior? Shouldn't the domains balance the spare > cpu bandwidth? >
Then what do you expect? You put the task into cgroup/3 in which the allowed cpus are restricted to CPU3, so of cause the scheduler will never schedule the task to run on other cpus.
Please refer to Documentation/cgroups/cpusets.txt for the usage of cpusets.
| |