Does anyone know how to manually change Interrup/IRQ numbers

mrtsufo · n00b Joined: 31 Mar 2005 Posts: 22

Hello, I need to find a way to manuualy assign the ethernet interrupts from the Gentoo side. I have a computer that I am connected to through remote. It is the only way I can reach it. The issue is that I have two eth devices conflicting. See interrupt 209:

CPU0
0: 51462725 IO-APIC-edge timer
1: 9 IO-APIC-edge i8042
4: 77 IO-APIC-edge serial
8: 0 IO-APIC-edge rtc
9: 0 IO-APIC-level acpi
14: 54794 IO-APIC-edge ide0
15: 1834319 IO-APIC-edge ide1
185: 0 IO-APIC-level ohci_hcd:usb2
193: 0 IO-APIC-level ehci_hcd:usb1
209: 17826296 IO-APIC-level eth2, eth0
225: 390221 IO-APIC-level eth1
NMI: 1403
LOC: 51456095
ERR: 0
MIS: 0

Any direction would be greaqtly appreciated. Thanks.

tuxmin · l33t Joined: 24 Apr 2004 Posts: 838 Location: Heidelberg

Is that a real problem? Recent Linux drivers should handle IRQ sharing flawlessly (as any modern PC OS)
Look at my output of /proc/interrupts

mrtsufo · n00b Joined: 31 Mar 2005 Posts: 22

Thank you for the reply. Everything is current. Latest Gentoo and kernels. This is an ASUS A8N-e Motherboard which I suspect is the reason. The problem is that I am 450 miles away. The eth card that is conflicting (and not working) is an Intel pro/1000 mt:

Intel(R) PRO/1000 Network Driver - version 6.0.60-k2
Copyright (c) 1999-2005 Intel Corporation.
ACPI: PCI Interrupt 0000:05:07.0[A] -> Link [APC2] -> GSI 17 (level, low) -> IRQ 209
e1000: eth0: e1000_probe: Intel(R) PRO/1000 Network Connection

I can't find a utility like the old "etherdisk" that could manually go in and change it.

I went to the Intel site, but I was told non of those will work in Linux.

Any ideas?

tuxmin · l33t Joined: 24 Apr 2004 Posts: 838 Location: Heidelberg

My guess is that this is not a IRQ conflict but that your NIC is broken...
I had a similar problem just this week, I could configure the interface and everything, but no
traffic would go through. The NIC all of a sudden died after working perfectly for months on a system I dindn't change.
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mrtsufo · n00b Joined: 31 Mar 2005 Posts: 22

Thank you also for the reply.

The NIC works fine if another is taken out. Same for the rest. The issue is that I was in front of this machine a couple days ago thinking the problem was NIC related. We thought we solved the issue. Not until I got home (450 miles later) did we realize it was IRQ related.

tuxmin · l33t Joined: 24 Apr 2004 Posts: 838 Location: Heidelberg

Interesting,

some kernel modules offer a parameter that let's you define an IRQ. Unfortunately the e1000 driver does not... (modinfo e1000).

Did you try to boot without ACPI? Maybe there's a problem in the ACPI routing?

Good luck, Alex!!
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