Re: [Jack-Devel] How can Jack run with less nperiods than ALSA?

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DateSat, 09 Nov 2013 12:55:38 -0500
From Paul Davis <[hidden] at linuxaudiosystems dot com>
ToKaspar Bumke <[hidden] at gmail dot com>
CcJACK <[hidden] at lists dot jackaudio dot org>
In-Reply-ToKaspar Bumke [Jack-Devel] How can Jack run with less nperiods than ALSA?
Follow-UpKaspar Bumke Re: [Jack-Devel] How can Jack run with less nperiods than ALSA? 
On Fri, Nov 8, 2013 at 6:18 AM, Kaspar Bumke <[hidden]> wrote:

> Hey,
>
> this is a question that is bothering me as I try and understand the Jack
> architecture better.
>
> Say that ALSA is running at 48kHz 256samples with 4 periods. What happens
> when I start jack with 2 periods? Where do the additional interrupts come
> from?
>

quite a bit of confusion here, it seems. JACK will not general work
correctly when sharing a device. If it is sharing a device, then it is
ALSA's job to generate the timingm, and it will use one of several possible
timer sources.

In general if JACK is using a particular PCM device, it is the *only* user
of that device, and ALSA is doing what JACK tells it to do.
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