Abysmal frame rate during disk IO

[Jonas Jochum]

Jens Schweikhardt wrote:

>ahc0: <Adaptec 29160 Ultra160 SCSI adapter> port 0xc400-0xc4ff mem 0xc7000000-0xc7000fff irq 11 at device 7.0 on pci1
>pci2: <Matrox MGA G550 AGP graphics accelerator> at 0.0 irq 11
>
Hi Jens,

it's suspicious that your SCSI controller and the graphics card share an 
irq.
Maybe it has to do with that. You might want to try changing the irq of 
either
your graphics card or your scsi controller and then see, if the problem 
still
exists.

Bye,
 Jonas