Subject: Re: [linux-audio-dev] IRQ rotation
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Fri Mar 05 2004 - 22:35:06 EET
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
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