From: Florian Schmidt <mista.tapas@gmx.net>
To: Mike Panetta <m.panetta@wegener.com>
Subject: Re: APIC priorities, can they be changed?
Date: Fri, 16 Feb 2007 17:18:23 +0100
User-Agent: KMail/1.9.6
Cc: "linux-os (Dick Johnson)" <linux-os@analogic.com>,
       linux-kernel@vger.kernel.org
References: <45D4A692.7090108@wegener.com> <fc.3b9aca006fe2a09c3b9aca00cb2296f3.fc598b@wegener.com> <45D4BB12.1050205@wegener.com>
In-Reply-To: <45D4BB12.1050205@wegener.com>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200702161718.23806.mista.tapas@gmx.net>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1404
Lines: 37

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/