Messages in this thread | | | Date | Fri, 21 Oct 2005 15:25:18 -0700 | From | Mark Knecht <> | Subject | Re: 2.6.14-rc5-rt3 - `IRQ 8'[798] is being piggy |
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On 10/21/05, Lee Revell <rlrevell@joe-job.com> wrote: > On Fri, 2005-10-21 at 11:52 -0700, Mark Knecht wrote: > > On 10/21/05, Lee Revell <rlrevell@joe-job.com> wrote: > > > On Fri, 2005-10-21 at 10:40 -0700, Mark Knecht wrote: > > > > On 10/21/05, Mark Knecht <markknecht@gmail.com> wrote: > > > > > Hi, > > > > > Maybe I'm catching something here? Maybe not - no xruns as of yet, > > > > > but I've never seen these messages before. Kernel config attached. > > > > > > > > > > dmesg has filled up with these messages: > > > > > > > > > > > This isn't a real problem. You enabled CONFIG_RTC_HISTOGRAM. Don't do > > > that. > > > > > > Lee > > > > > > Right, but the 'piggy' messages are a real prblem, aren't they? > > No I don't think so. CONFIG_RTC_HISTOGRAM is a hack, designed to work > with a specific test program that runs SCHED_FIFO and poll()s on the > RTC. VLC apparently poll()s on the RTC but does not run SCHED_FIFO. So > of course there will be delays. > > Now that the kernel has good soft realtime support and non-root RT > scheduling, these apps really need to adopt a correct soft RT design > like JACK. AFAICT they don't even bother to try to get SCHED_FIFO for > the time-sensitive rendering threads. I can't even get totem-xine (the > default "Sound and Movie Player" for Gnome) to keep the audio and video > in sync. mplayer only plays smoothly if I run it at nice -10. Etc. > > The Linux kernel is pretty good for RT these days but compared to OSX or > even Windows the apps are a joke. > > Lee
Lee, Indeed, you are correct. Apparently under character devices I had turned on the RTC histogram feature. With that off I am not only getting the maximum latency values we expect.
Now I'll have to let it run for hours/days to see if I catch any info on these xruns, should I get another rash of them. Yesterday they came only after about 14 hours of work. I had none the previous two days.
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