On 3/30/07, Eben King <eben01@verizon.net> wrote:
>
> So I was looking at /proc/interrupts tonight, and did some figurin', and
> came up with (blank location = onboard):
>
> IRQ driver device location
> 0 timer
> 1 i8042
> 2 (cascade)
> 3 serial
> 4
> 5
> 6
> 7
> 8 rtc
> 9 acpi
> 10 ehci_hcd:usb5
> eth0 ethernet card PCI3
> 11 ide2 "RAID" card PCI1
> uhci_hcd:usb1
> uhci_hcd:usb2
> uhci_hcd:usb3
> uhci_hcd:usb4
> aic7xxx SCSI card PCI2
> EMU10K1 SB Live! PCI4
> nvidia video AGP
> 12 i8042
> 13
> 14 ide0 optical drives
> 15 ide1 HD
>
> That seems a rather poor allocation to me, especially with all those
> things
> sharing IRQ11. OK, the SCSI card is barely used, but sharing the video
> with
> ide2 has got to be bad for both of their performances. Good thing PCI5 is
> empty, or it'd probably be there too.
>
> Anyhow, I'm thinking about getting a card that needs its own
> interrupt. Is
> there a way to change these assignments? Are they chosen by PCI slot?
>
> --
No they are chosen by there plug and play information that gets read by the
bios. Each card that is plug and play , has a identifier information. One
part of that information is information about it interrupt requirements. As
specified in the orginal 1.0a spec. So in theory assuming you have a
quality card going into the machinesn the board is in complete complaince
with the at least the orginal 1.0a which was released in 1994 you should be
fine. Nothing should have to be done by your part.
Now if your not happy with this, most bioses will allow you to turn off pnp
and manually assing irq to your devices.
-eben QebWenE01R@vTerYizUonI.nOetP http://royalty.mine.nu:81
> An ASCII character walks into a bar and orders a double. "Having a bad
> day?" asks the barman. "Yeah, I have a parity error," replies the ASCII
> chrcter. The barman says, "Yeah, I thought you looked a bit off." - Skud
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