Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.4

[Rui Nuno Capela]

Ingo Molnar wrote:
>
> Rui Nuno Capela wrote:
>
>> OK. Currently with RT-V0.3.2.
>>
>> So it seems that the jackd -R is no more an issue here.
>
> great.
>
>> However (oh no!:) those jackd -R xruns are still frequent, much
>> frequent than RT-U3, which is my stable RT kernel atm.
>
> -V0.4.1 could help with this problem. There were a number of places
> where the PREEMPT_REALTIME kernel missed reschedules so it could easily
> happen that jackd would sit in the runqueue waiting to be executed and
> the kernel got quickly out of a critical section but then the kernel
> 'forgot' to reschedule for many milliseconds!
>

On RT-V0.4.1, xruns seems slighly reduced, but plenty enough for my taste.

Running jackd -R with 6 fluidsynth instances gives me 0 (zero) xruns on
RT-U3, but more than 20 (twenty) on RT-V0.4.1, under a 5 minute time
frame. It was 30 (thirty something) on RT-V0.4, but overall "feel" is
about the same.

Cheers.
-- 
rncbc aka Rui Nuno Capela
rncbc@xxxxxxxxx


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