[linux-audio-dev] IRQ rotation

[Steve Harris]

On Fri, Mar 05, 2004 at 11:03:46 -0800, Tim Hockin wrote:
> >            CPU0       
> >   0:   12578480          XT-PIC  timer
> >   1:      22347          XT-PIC  keyboard
> >   2:          0          XT-PIC  cascade
> >   5:          0          XT-PIC  Maestro3
> >   8:          1          XT-PIC  rtc
> >  10:      58915          XT-PIC  usb-uhci, ohci1394, eth0, Texas
> > Instruments PCI4451 PC card Cardbus Controller, Texas Instruments PCI4451
> > PC card Cardbus Controller (#2)
> >  11:     774663          XT-PIC  nvidia
> >  12:      28909          XT-PIC  PS/2 Mouse
> >  14:      16635          XT-PIC  ide0
> > NMI:          0 
> > ERR:          0
> > 
> > Everything beats the soundcard, including the video drivers.
> 
> It shows that your soundcard had ZERO interrupts.  I have trouble believing
> that over the course of THREE HOURS it tried and tried and could not get a
> single interrupt through.  Is that what you're saying?

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.
 
> 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?

- Steve