[LAU] Mother Board IRQ allocation

david gnome at hawaii.rr.com
Thu Jan 3 08:19:49 UTC 2013

On 01/02/2013 12:08 PM, Len Ovens wrote:
> I don't know how useful this will be. My MB, an A-bit AC7 (10 years old?),
> has the option to turn off IRQs for USB and/or video. My first thought was
> that would not be useful, but it turns out what it does is turn of the
> bios IRQ selection. This means the Linux kernel has to do this... and the
> Linux kernel does a better job of allocating IRQs than the bios does. The
> ehci IRQ is now on it's own (USB 2.0) where it used to be lumped on 16
> with 4 other things. eth0 has it's own irq too, as do both my audio cards.
> I was still able to boot from a USB 2 device as well.
> So in the case of finding PCI slots that give solo IRQs, it is worth
> playing with the bios settings, even things that do not make sense.

That's interesting! Here I've always thought that it was turning off the 
IRQ (disabling the device)!

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