Re: Question regarding 'sched: RT throttling activated'

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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
> 
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