[plug] agp/pci interrupt problems

[Simon Scott (SSC)]

OK here's what happened :)

1) I disabled devices in the bios, I think the serial ports and USB. 
2) I also set 'memory hole' at 15-16M, and set 'PCI Delay Transitions' to
disabled.

I then forcibly set the IRQs on the different lines to spare ones.

No go, devices still sharing IRQs. 

I moved my net card from the bottom port (6?) up one. Now it has its own IRQ

I set the IRQ on line 1 (AGP and PCI 1) to 15 and rebooted

Everything works fine. No more slow-downs, stalls, or opengl crashes. I even
installed Quake 3 for linux and get a similar framerate to windows (I was
quite impressed) altho mouse movement doesnt feel as smooth.

As it turns out, the onboard sound and the scsi card are still sharing an
IRQ, but it seems 100% stable. If i really cared Id move the scsi card to
PCI #3, but I dont :)

Opengl hardware accel doesnt work without the agpgart module loaded, so I
put it in /etc/modules and no probs now.

As I said, I installed Quake 3. Initially it wouldnt boot because it couldnt
get the sound device (Im running arts sound server under KDE 2), so I ran it
with 'artsdsp quake3' and the game worked, but still no sound.... looking
thru the arts doco I found the option '-m emulate memory mapping (for
quake)' so 'artsdsp -m quake3' gave me quake 3 with sound. The delay on the
sound was unbearable so I reduced the latency (buffer settings in the sound
server setup under KDE2) and now it works 100%. 

Ill try UT next, and try to apply the umods for Tac Ops etc... If that all
works I will have almost zero reason to boot into windows anymore.

Im still a little worried that my gfx card isnt getting an IRQ, but hey if
it works who cares.

I did a little happy-dance when quake 3 came up and I switched to 1024x768
and it still ran super-smooth :)

-----Original Message-----
From: Brad Campbell [mailto:brad at seme.com.au]
Sent: Thursday, March 15, 2001 5:13 PM
To: plug at plug.linux.org.au
Subject: Re: [plug] agp/pci interrupt problems


Matt Kemner wrote:
> 
> On Thu, 15 Mar 2001, Mike Holland wrote:
> 
> > > I have a Matrox G200 AGP, and it doesn't show up in /proc/interrupts,
so
> >
> > Could that be because Linux isnt actually using interrupts on the card?
> > (Even though #11 is assigned)
> 
> A very valid point - and if that's true I would probably be better off
> disabling the VGA interrupt so I can use it for the first PCI slot,
> although in my case the first PCI slot is used by a VoodooII, which
> doesn't use an IRQ either, so it doesn't really matter
> 
>  - Matt

/proc/interrupts only shows interrupts that have been actively registered
by something and are in use.
Look at irq 3/4 and you will notice that they only show up when you
open /dev/ttyS0 or /dev/ttyS1
Same with the irq assigned to your eth card. ifdown the interface and
watch the interrupt disappear.

I have a G450 in a box at home, and it only assigns an interrupt when 
I'm using X4.0.2 with agpgart.o and mga.o loaded and using the dri
interface.

BUT, it shares nicely with my pci fm801 sound card and my dec tulip eth
card.

-- 
Brad....
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