Re: IO APIC IRQ assignment

From: James Courtier-Dutton
Date: Tue May 30 2006 - 08:31:07 EST


Keith Chew wrote:

We asked the manufacturers if they can do a physical modication for
us, but unfortunately this is not possible. The engineer did mention
that under Windows XP in "IO APIC" mode, it is possible to assign
different IRQs to the USB and BTTV.

Is this possible in Linux? We have tried enabling IO APIC in the
kernel, but the IRQs are still shared.

Please advise if it is even possible in Linux to achieve what we want.


You could try enabling "Bus Options" ->
[*] Message Signaled Interrupts (MSI and MSI-X)

or in .config
CONFIG_PCI_MSI=y

It only works for PCI devices.

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