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From: Soeren Schmidt <sos@spider.deepcore.dk>
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To: Jonas Jochum <jonas.jochum@gmx.net>
Date: Fri, 25 Apr 2003 18:42:36 +0200 (CEST)
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cc: multimedia@FreeBSD.ORG
cc: Jens Schweikhardt <schweikh@schweikhardt.net>
Subject: Re: Abysmal frame rate during disk IO
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It seems Jonas Jochum wrote:
> 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.

Actually I dont think it matters much, its more likely due to the way
the bt8?8 cards work. The image is DMA'd over the PCI bus and has to
compete for bandwidth with everything else...

-Søren