linux-kernel - Re: APIC priorities, can they be changed?

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Date:	Fri, 16 Feb 2007 17:18:23 +0100
From:	Florian Schmidt <mista.tapas@....net>
To:	Mike Panetta <m.panetta@...ener.com>
Cc:	"linux-os (Dick Johnson)" <linux-os@...logic.com>,
	linux-kernel@...r.kernel.org
Subject: Re: APIC priorities, can they be changed?

On Thursday 15 February 2007, Mike Panetta wrote:
> I did try that.  The BIOS only allows me to either allocate an IRQ to be
> a PCI interrupt, or reserve it (for what I have no idea).  The IRQ's
> listed in the BIOS are also different from the ones Linux sees.  I think
> the BIOS is seeing the XT-PIC IRQ numbers and Linux is seeing the APIC
> numbers.  For example the little bios blurb that prints before the
> system boots says the USB controller I am interested in is
> assigned/using IRQ 10, Linux sees it using IRQ 18.
>
> I have found that I can keep Linux from using the APIC by disabling it
> with a kernel command line switch, but that does not help, it just makes
> Linux use the XT-PIC instead of the IO-APIC to do IRQ routing.
>
> So I guess I'm back to my original question of  'Would changing the
> vector numbers do what I want?' and if the answer is 'yes', how would I
> do it?

With XT-PIC, there was a way to change the priotrities used by the IRQ. It was 
called irqtune iirc.

Ah ya,

http://cae.best.vwh.net/irqtune/

Dunno if there's something similar available for APIC..

Regards,
Flo

-- 
Palimm Palimm!
http://tapas.affenbande.org
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