Re: real-time threaded IO with low latency (audio)

Paul Barton-Davis (pbd@Op.Net)
Fri, 23 Jul 1999 09:54:49 -0400


In message <379864C0.1E94881D@syscon.uu.se>you write:
>Paul Barton-Davis wrote:
>>
>> I consider the idea of a single-processor system replacing, say, a
>> dedicated Lexicon rack unit or a Quadraverb 20, to be pretty
>> silly. However, using a dual processor system, and binding a DSP-like
>> thread to one of the processors has a lot of promise, and I'm pretty
>> close to doing this once i get Tim's pset patches installed.
>
>Will this DPS-like thread allow you to turn of such things as IO-apic
>interrupts and reroute all interrupts to the processors that is not
>running the real time thread?

actually, what is really needed is interrupt filtering, not
disabling. because the soundcard ADAC works as very nice timer, i
actually want the real time thread to get interrupts from it. at the
same time, i would like that processor to receive no other interrupts.

do you know of any way to do this ?

>If your goal is at the "5 ms level" then interrupts may not matter to
>you. Is this the case?

so far, it hasn't been a problem, but that doesn't mean i'm not
interested in improving things :)

--p

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