Re: [patch] voluntary-preempt-2.6.9-rc1-bk12-R5

[Rui Nuno Capela]

Ingo Molnar wrote:
>
>Rui Nuno Capela wrote:
>
>> Yes, I didn't mentioned that, but I do have provided it and assumed on
>> all my reported trials:
>>
>>     echo 0 > "/proc/irq/8/rtc/threaded"
>>     echo 0 > "/proc/irq/17/Intel ICH5/threaded"
>>
>> Thanks.
>
> weird. You shouldnt get any xruns - unless jackd for whatever reason
> doesnt truly run under RT priorities. (there was some NPTL related
> buglet that caused such a symptom in earlier jackd versions.)
>

I thought it has been ironed out here.

Note that the difference arises only whether softirq-preempt and
hardirq-preempt are enabled or not.

- with softirq-preempt=0 and hardirq-preempt=0, jackd realtime runs
perfectly, as advertised (jackd -R -p 128 -n 2), and sounds good too ;)

- with softirq-preempt=1 and hardirq-preempt=1, the XRUN storm is terribly
annoying. And sound is obviously a crackling festival.

Remember, that all this is on same hardware, same smp kernel configuration
(CONFIG_SCHED_SMT is not set), same everything else (SuSE 9.1, NPTL 0.61,
jack-0.98.11cvs).

I hope the latency-traces show something useful. Til then...

Take care.
-- 
rncbc aka Rui Nuno Capela
rncbc@xxxxxxxxx

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