Looks like this is a hardware problem. Looking at the kernel log, I found
irq 16: nobody cared (try booting with the "irqpoll" option)
irq 16 is being used by nvidia and the onboard USB ports. After disabling USB
in the BIOS, it seems like everything is running smooth. Because all my
control devices are connected by usb, I re-enabled USB and started the kernel
with acpi=debug. So far it's running - now I'll check shader-performance...
Torsten
> This mirrors comments to the OSG mailing list, where people have reported
> performance issues with multiple GPUs and screens. There hasn't been much
> of a resolution there; some people have the problem, others don't. I've
> put together a multi-GPU machine to explore these issues; now I just need
> to buy another screen :)
>
> What threading mode are using? Could you post a screenshot of the OSG
> statistics (cycle debug statistics twice) and your X configuration file?
>
> Tim
>
> On Mon, Nov 1, 2010 at 9:06 AM, Torsten Dreyer <tors...@t3r.de> wrote:
> > Hi,
> >
> > as pointed out in other threads, I am currently assembling a machine with
> > five
> > nVidia cards. The machine and the cards are fast enough to render a
> > steady 60fps, synced to vblank.
> > But this is only with shaders disabled. The moment, I enable shaders and
> > 3d-
> > clouds, the frame rate drops to 20fps and sometimes even less. This does
> > not
> > happen when I limit the display to just one single GPU. One GPU with dual
> > screen ("TwinView") runs at framerates beyond limits even with all
> > shaders on
> > and quality level to highest. The moment I add a second card to the
> > setup, it
> > slows down significantly.
> > I know that shaders are little program fragments running on the GPU
> > itself. Now, what happens, if a shader effect spawns multiple GPU's, e.g.
> > a cloud which is visible across the entire window?
> >
> > Cheers, Torsten
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