From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750743AbWFAJfU (ORCPT ); Thu, 1 Jun 2006 05:35:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750817AbWFAJfU (ORCPT ); Thu, 1 Jun 2006 05:35:20 -0400 Received: from LNeuilly-152-21-64-8.w80-15.abo.wanadoo.fr ([80.15.165.8]:54984 "EHLO serveur2.macsoft-sa.com") by vger.kernel.org with ESMTP id S1750743AbWFAJfT (ORCPT ); Thu, 1 Jun 2006 05:35:19 -0400 Message-ID: <447ED595.2040902@free.fr> Date: Thu, 01 Jun 2006 11:55:01 +0000 From: "s.a." User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.13) Gecko/20060512 X-Accept-Language: fr-fr, en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: io apic and shared irq questions Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, Regarding an embedded realtime system, I have got a communication board on pci bus . I would like it's interrupt not being shared (with usb) , because the component receives an it every 100us and is realtime determinist. I looked at how was routed IRQ's with the io apic , although it is able to use 24 irq's, linux always share my PCI boards IRQ with another component and do not use all the 24 irq's range capability of ioapic. Do you think it is possible to program the ioapic in order to have a better irq mapping and avoid this problem and use all the range of availbale vectors ? Best Regards Steph