Re: Real-Time Preemption, -RT-2.6.10-rc2-mm3-V0.7.31-7

[Rui Nuno Capela]

Ingo Molnar wrote:
>
> * Rui Nuno Capela <rncbc@xxxxxxxxx> wrote:
>
>> > 		if (!(count++ & 1))
>> > 			gettimeofday(0,1);
>> > 	}
>
>> Done that.
>>
>> New XRUN traces are attached, while running RT-V0.7.31-15 now.
>> However, I don't seem to get any notorious difference on the results,
>> since previous ones. All latencies traced ca. 26-27 usecs.
>
> ah, found the reason why the trace length didnt improve:
>
> +               {       // Trigger off trace every other poll...
> +                       static unsigned int xruntrace_count = 0;
> +                       if ((xruntrace_count++ % 1) == 0)
> +                               gettimeofday(0,1);
> +               }
>
> this should either be '& 1' as i originally suggested, or '% 2'. The way
> it is right now it will stop the trace every time - i.e. what we had
> before.
>
> so please disregard my freerunning suggestionsand try the two-periods
> solution first.
>

Very good eyes! It was all my mistake. Sorry, sorry. It was a sure typo
after all, the '%' key is right next to '&', at least on my on my keyboard
:)

Will correct it and bbl...
-- 
rncbc aka Rui Nuno Capela
rncbc@xxxxxxxxx

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