David Teigland wrote:
> I would like to change the IRQ which my Qlogic Fibre Channel HBA is
> grabbing without moving the card to a different slot. As is, the FC card
> and the SCSI controller are sharing IRQ 19. I believe this is the cause
> of lower bandwidth when compared to a system where they have different
> IRQs. I've tried using setpci with no success. Is it possible to change
> this?
>
> /proc/interrutps on system 1 - bad
> 19: 17191 IO-APIC-level aic7xxx, aic7xxx, qlogicfc
Some motherboards directly link the onboard scsi card interrupt with
the one associated to the last pci slot, at the copper level or the low
level pci chip controller.
In those cases, if you want to stop interrupt sharing, you _must_ move
your qlogic board to another slot.
For the Asus P2B-DS and XG-DLS boards for example, the slots to avoid
are the first one (linked to the AGP slot interrupt) and the last one
(linked to the onboard scsi controller). Your mileages may vary for
other motherboards.
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