Messages in this thread | | | Date | Tue, 13 Sep 2011 10:33:06 +0530 | From | Srivatsa Vaddagiri <> | Subject | Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs unpinnede |
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* Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com> [2011-09-13 09:45:45]:
> * Peter Zijlstra <a.p.zijlstra@chello.nl> [2011-09-12 14:35:43]: > > > Of course it does.. and I bet you can improve that slightly if you > > manage to fix some of the numerical nightmares that live in the cgroup > > load-balancer (Paul, care to share your WIP?) > > Booting with "nohz=off" also helps significantly. > > With nohz=on, average idle time (over 1 min) is 10.3% > With nohz=off, average idle time (over 1 min) is 3.9%
Tuning min_interval and max_interval of various sched_domains to 1 [a] and also setting sched_cfs_bandwidth_slice_us to 500 does cut down idle time further to 2.7% ..
This is perhaps not optimal (as it may lead to more lock contentions), but something to note for those who care for both capping and utilization in equal measure!
- vatsa
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