Hello, On Thu, May 04, 2017 at 10:19:46AM +0200, Vincent Guittot wrote: > > schbench inside a cgroup and have some base load, it is actually > > expected to show worse latency. You need to give higher weight to the > > cgroup matching the number of active threads (to be accruate, scaled > > by duty cycle but shouldn't matter too much in practice). > > I don't have to change anything cgroup weight with mainline to get > good number which means that the base load which is quite close to > null, is probably not the problem
So, while that *could* be the case, it could also be the baseline incorrectly favoring the nested cfs_rqs over other tasks because of the nested runnables being inflated with blocked load avgs. I think it'd be a good idea to test with matching weight to put things on the even ground. Thanks. -- tejun
