On Mon, Aug 1, 2011 at 11:34 AM, Mike Galbraith <efault@xxxxxx> wrote: > On Mon, 2011-08-01 at 09:42 +0100, Rolando Martins wrote: >> Hi Peter, >> is there any progress on the CONFIG_RT_GROUP_SCHED front? > > Out of curiosity, why would you want that in a -rt kernel? I am building a rt middleware that uses cgroups to reserve cpu bandwidth for a set of tasks. But I also interested in minimization latencies... > > (I haven't done any PI testing with that, but I can imagine the throttle > causing heartburn) > > -Mike > >> I don't know if this is related, but in 33-rt if I used a low (=100) >> cpu_runtime_us and cpu_period_us then I would get some freezes >> (something that does not happen in 2.6.39). > > (providing a realtime budget of 100 whole microseconds to a kernel where > everything and it's brother is realtime is unlikely to go well) I empirically tested values until I reached this one. Anything above this would result in a huge amount of jitter (to all tasks under a control group), at least on my boxes (corei7 920, and AMD phenom x4 950). Rolando > > -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
