[linux-audio-user] Re: [linux-audio-dev] [ANN] E-Radium V0.61b

From: Eric Dantan Rzewnicki <rzewnickie@email-addr-hidden>
Date: Wed Jul 13 2005 - 17:49:11 EEST

On Tue, Jul 12, 2005 at 07:34:07PM -0400, Lee Revell wrote:
> On Wed, 2005-07-13 at 01:03 +0200, Florian Schmidt wrote:
> > Some semieducated blabbering ahead (might be all wrong):
> > I think i once read that interrupt handling "short circuits" the linux
> > scheduler (in the sense that not only at every timer interrupt but also
> > at the end of finishing any interrupt handler the kernel looks which
> > processes are ready to run etc. and maybe there's a high prio process
> > waiting just for that interrupt (by i.e. polling or reading on a device
> > file).
> > So for all those realtime processes that depend on events that are
> > triggering interrupts (like soundcards' irqs) the timer interrupt really
> > doesn't matter. I'm not sure at all though this applies to midi handling
> > (and especially to alsa_seq when routing from one app to another) or is
> > even correct in any sense at all :)
> > Anyone can shed light?
> Correct, it's not an issue for apps driven by hardware interrupts like
> JACK, because the sound card consumes data at a constant rate. But for
> MIDI or video where you have to periodically push data to the device it
> matters.

What is driving the kernel-devs to regress on this issue?

Eric Dantan Rzewnicki  |  Systems Administrator
Technical Operations Division  |  Radio Free Asia
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Received on Wed Jul 13 20:15:20 2005

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