* Lee Revell <[email protected]> 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.
Ingo
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