From: Mike Galbraith <efault@gmx.de>
To: Wolfgang Wallner <Wolfgang.Wallner@br-automation.com>
Cc: linux-rt-users@vger.kernel.org, John Kacur <jkacur@redhat.com>,
Josef Baumgartner <Josef.Baumgartner@br-automation.com>
Subject: Re: Question regarding 'sched: RT throttling activated'
Date: Tue, 11 Sep 2012 20:10:29 +0200 [thread overview]
Message-ID: <1347387029.7018.53.camel@marge.simpson.net> (raw)
In-Reply-To: <OF6683632B.9200AAEB-ONC1257A76.0053E7B9-C1257A76.00558786@br-automation.com>
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'.
-Mike
next prev parent reply other threads:[~2012-09-11 18:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-11 15:34 Question regarding 'sched: RT throttling activated' Wolfgang Wallner
2012-09-11 18:10 ` Mike Galbraith [this message]
2012-09-11 18:55 ` Sven-Thorsten Dietrich
2012-09-12 3:40 ` Mike Galbraith
-- strict thread matches above, loose matches on Subject: below --
2012-09-11 11:38 Wolfgang Wallner
2012-09-11 12:10 ` John Kacur
2012-09-11 13:20 ` Mike Galbraith
2012-09-11 13:05 ` Mike Galbraith
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