On Sep 11, 2012, at 11:10 AM, Mike Galbraith <efault@xxxxxx> wrote: > On Tue, 2012-09-11 at 17:34 +0200, Wolfgang Wallner wrote: > >>>> My questions are now: >>>> >>>> * What does this logging entry mean? >>>> Could you please point me to some information about RT throttling >>>> so that I can understand what's it about? >> >>> With stock settings, it means realtime task[s] consumed > 95% of the >>> throttle interval (1s), so the throttle activated, allowing >> SCHED_NORMAL >>> tasks to have a sip of CPU, to let you try to save the box from >> nutty RT >>> CPU hogs. See kernel/sched_rt.c. >> >> I think if the application turns into a cpu hog... > > Where from comes 'if'? You presented evidence, so methinks there's not > a _lot_ of room for an 'if', there's just a missing 'why'. Well, as you know a lot of folks do polling, but its important to make sure not ALL cores are doing that... Need to look at the code, maybe we could add a mask to restrict throttling per cpu (e.g. to 0) ? Sven > > -Mike > > -- > 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 -- 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