Re: how to tell Linux *not* to share IRQs ?

From: Alan Cox (
Date: Wed Jul 25 2001 - 18:37:08 EST

> I cannot for the life of me get Linux to use all the available IRQs; it
> insists on sharing IRQs even though there are enough available to give
> each PCI device a separate one.

The actual sharing rules for PCI interrupt lines are frequently determined
by the actual wiring on the motherboard. It is quite possible the interrupt
lines on some of your slots are physically wired together, and indeed quite
likely that this is true if you have five or more slots

> parallel and USB, giving all manner of "pci=" kernel parameters, tried
> with APIC and without (even though it's UP, it seems to still use it if

APIC can help by removing ISA/PCI sharing, but not PCI to PCI.


  "Have you noticed the way people's intelligence capabilities decline
   sharply the minute they start waving guns around?"
 		-- Dr. Who
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This archive was generated by hypermail 2b29 : Tue Jul 31 2001 - 21:00:25 EST