Messages in this thread | | | Date | Fri, 23 Aug 2013 12:09:13 +0200 | From | Peter Zijlstra <> | Subject | Re: [sched_delayed] sched: RT throttling activated |
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On Fri, Aug 23, 2013 at 10:53:02AM +0200, Martin Mokrejs wrote: > Hi, > I tried to figure out what this message really means. I came to > https://rt.wiki.kernel.org/index.php/Frequently_Asked_Questions > but I am still lost. I lack in the FAQ some user-related information. > The first paragraph is still unclear to me. I have a i7-2640M based > laptop, hyperthreading is enabled by BIOS but I shut down the two > emulated cores by (no BIOS option to disable HT): > > Would you please clarify what the "[sched_delayed] sched: RT throttling activated" > really means?
It means you have (a) real-time task(s) that consume significant amount of time. At some point we throttle them in an attempt to keep the system from falling over.
> Is that because there is some RT-requiring application on my system?
Yep.
> I don't know of any (or don't care about real-time responsiveness except that ALSA > drivers require me to have CONFIG_SND_HRTIMER=y). Per Goggle answers could the > culprit be nfsd? Then I will recompile is as a module.
Unlikely, I don't think I've ever seen anybody run their nfsd with RT priority. Also, you can run RT tasks regardless of the config options. SCHED_RR and SCHED_FIFO are POSIX specified and always available.
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