[linux-audio-dev] IRQ rotation

[Steve Harris]

On Fri, Mar 05, 2004 at 01:54:00 -0800, Tim Hockin wrote:
> On Fri, Mar 05, 2004 at 08:35:06PM +0000, Steve Harris wrote:
> > No, I hadn't used the ALSA modules :) The interrupts get through unless
> > I use < 2048 samples / period, if I do ALSA reports lost interrupts
> > constantly.
> 
> hrrmm...I doubt if it is due to IRQ priorities.  I mean, really, any modern
> CPU can handles 10s or 100s of thousands of IRQs per second..

Hm... ok. I dont think its a s/w problem FWIW, other people I know with
the same machine (dell i8100) have the same problem.
 
> > > This does not show a particularly high interrupt load, either.  It does show
> > > that you get about 70 video interrupts per second (ask nvidia!) and it shows
> > > that you seem to have the timer at 1024 HZ (lowlatency patch?).
> > 
> > You get one per screen refresh dont you?
> 
> Not on my system :)  Many systems don't even have an IRQ for video.  What
> would the video IRQ need every refresh?  You're not punping data there
> constantly unless the screen is changing..

Heh, shows what I know about video :)

- Steve