Messages in this thread | | | Date | Sat, 22 Oct 2005 05:44:58 +0200 | From | Ingo Molnar <> | Subject | Re: 2.6.14-rc5-rt3 - `IRQ 8'[798] is being piggy |
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* Lee Revell <rlrevell@joe-job.com> wrote:
> On Fri, 2005-10-21 at 15:25 -0700, Mark Knecht wrote: > > > > > > 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. > > > 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. > > In general you should avoid enabling/disabling random config options > between runs. If you keep changing the .config it makes it impossible > to hunt bugs or compare one set of results to another.
i think i'll remove the CONFIG_RTC_HISTOGRAM feature altogether from the -rt tree - meanwhile we've got more advanced (and less verbose) latency histogram features via WAKEUP_LATENCY_HIST, PREEMPT_OFF_HIST and INTERRUPT_OFF_HIST.
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