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How to control IRQ assignment?
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Joseph_sys
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Joined: 08 Jun 2004
Posts: 2712
Location: Edmonton, AB

PostPosted: Fri Jul 22, 2005 2:27 pm    Post subject: How to control IRQ assignment? Reply with quote

I have a Sata Drive and Network Controller on the same IRQ 10. These are two different chips.
I couldn't find in Bios setting to allow me to assign an IRQ onto them, I can only enable or disable Network Controller (it is Asus A8V motherboard).

I'm convinced that the error I'm getting and hang-ups:
Kernel panic - not syncing: Aiee, killing interupt handler.

are related to the fact that both controllers share one IRQ; in normal circumstances that could not be a problem but on Linux with intensive CPU compiling and disk access, having these two on the same IRQ I think is causing this error and hangups

I know I can buy another network card and solve this problem, but maybe I could re-assign the IRQ to any of them.
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54397
Location: 56N 3W

PostPosted: Fri Jul 22, 2005 2:50 pm    Post subject: Reply with quote

Joseph_sys,

The PCI specification demands that devices be able to share IRQs. Linux device drivers make a good job of it too.
You cannot assign IRQs manually, however, if you are using ACPI, APIC and IO-APIC in your kernel IRQ balancing is the default behavior.

Meanwhile, for debug, rebuild your kernel with the network card driver as a module. Only load it by hand after you have logged in. I don't think it will fix your problem but it will provide morde data.
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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