Re: [proaudio] kernel config

[Dominique Michel <dominique.michel@xxxxxxxxxxxx>]

Le Wed, 21 Mar 2007 21:48:44 +0100,
Thomas Kuther <gimpel@xxxxxxxxxxxxxxxx> a écrit :

> On Mi, 21.03.07 08:01 Dominique Michel <dominique.michel@xxxxxxxxxxxx>
> wrote:
> 
> > Le Wed, 21 Mar 2007 08:53:25 +0100,
> > Thomas Kuther <gimpel@xxxxxxxxxxxxxxxx> a écrit :
> > 
> > > On Mi, 21.03.07 21:26 Geoff Beasley <songshop@xxxxxxxxxxxxxxx>
> > > wrote:
> > > 
> > > > what alsa are you running ?
> > > > 
> > > > g.
> > > > 
> > > ... and what's your output of 
> > > $ cat /proc/interrupts
> > 
> > Alsa from the kernel
> > 
> > $ cat /proc/interrupts
> >            CPU0       
> >   0:   12280250    XT-PIC-XT        timer
> >   1:      20913    XT-PIC-XT        i8042
> >   2:          0    XT-PIC-XT        cascade
> >   3:     109811    XT-PIC-XT        ohci_hcd:usb1
> >   4:      44460    XT-PIC-XT        ohci1394, eth0
> >   5:   12214772    XT-PIC-XT        ohci_hcd:usb2
> >   6:     304680    XT-PIC-XT        ohci_hcd:usb3, ehci_hcd:usb4
> >   7:          1    XT-PIC-XT        parport0
> >   8:          2    XT-PIC-XT        rtc
> >   9:   21237749    XT-PIC-XT        acpi, EMU10K1
> >  10:          4    XT-PIC-XT        bttv0
> >  11:     972580    XT-PIC-XT        nvidia
> >  12:          4    XT-PIC-XT        i8042
> >  14:     236149    XT-PIC-XT        ide0
> >  15:     217965    XT-PIC-XT        ide1
> > NMI:   98265431 
> > LOC:   12280612 
> > ERR:          0
> > MIS:          0
> > 
> > This is with the 2.6.19. I don't get any interrupts for the nvidia
> > with the 2.6.20 and 21.
> > 
> 
> No IO-APIC? Do you have ACPI disabled or pci=noacpi set in grub.conf?
> Because here it looks like:
> 
> tom@SiRiUS ~ $ cat /proc/interrupts 
>            CPU0       
>   0:        284   IO-APIC-edge      timer
>   1:       2150   IO-APIC-edge      i8042
>   6:          5   IO-APIC-edge      floppy
>   7:          0   IO-APIC-edge      parport0
>   8:          2   IO-APIC-edge      rtc
>   9:          0   IO-APIC-fasteoi   acpi
>  12:          4   IO-APIC-edge      i8042
>  14:      71042   IO-APIC-edge      ide0
>  15:     394948   IO-APIC-edge      ide1
>  16:      50453   IO-APIC-fasteoi   eth0
>  17:      47583   IO-APIC-fasteoi   ehci_hcd:usb1, uhci_hcd:usb2,
> uhci_hcd:usb3, uhci_hcd:usb4 
> 18:    112936   IO-APIC-fasteoi   ide2
>  19:          0   IO-APIC-fasteoi   ICE1724
>  20:      97037   IO-APIC-fasteoi   ICE1712
>  21:    5608587   IO-APIC-fasteoi   nvidia
> NMI:          0 
> LOC:   46108412 
> ERR:          0
> MIS:          0
> 
> 2.6.20-rt8 that is.
> 
> Cheers,
> Tom

I get in my bios and I have something new now (after playing with the ps2
setting). I also removed the pci=noacpi in grub for the 2.6.21:

           CPU0       
  0:        270    XT-PIC-XT        timer
  1:        176    XT-PIC-XT        i8042
  2:          0    XT-PIC-XT        cascade
  3:       5982    XT-PIC-XT        ohci_hcd:usb1
  4:       1669    XT-PIC-XT        ohci1394, eth0
  5:         98    XT-PIC-XT        ohci_hcd:usb2
  6:        783    XT-PIC-XT        ohci_hcd:usb3, ehci_hcd:usb4
  7:          1    XT-PIC-XT        parport0
  8:          2    XT-PIC-XT        rtc
  9:          0    XT-PIC-XT        acpi
 10:          4    XT-PIC-XT        bttv0
 11:     427702    XT-PIC-XT        EMU10K1
 12:          4    XT-PIC-XT        i8042
 14:      21349    XT-PIC-XT        ide0
 15:       6951    XT-PIC-XT        ide1
NMI:          0 
LOC:     477708 
ERR:          0
MIS:          0

I will see if it work.

And yes, no io-apic. It doesn't help much with a realtime kernel. And APIC is
not a completely new hardware design but some kind of glue over the xt-pic and
it have more overrun.

In case of troubles, you may have to go at the xt-pic level because the
bios, as the PCI slots, doesn't understand something else. Sometime, shared IRQ
are easy to solve because you see them at the APIC level. But sometime, the
APIC level is looking good and you are in trouble. When this append, the only
possibility to see the problem is to shift to the PIC interface and solve the
problem at that level.

And when it is done, it is better to stay at the PIC level because it is
simpler and faster in the hardware.

Ciao,
Dominique