Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262912AbTFOWNK (ORCPT ); Sun, 15 Jun 2003 18:13:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262918AbTFOWNK (ORCPT ); Sun, 15 Jun 2003 18:13:10 -0400 Received: from 12-234-128-127.client.attbi.com ([12.234.128.127]:19414 "EHLO andrei.myip.org") by vger.kernel.org with ESMTP id S262912AbTFOWNI (ORCPT ); Sun, 15 Jun 2003 18:13:08 -0400 Subject: Re: generic method to assign IRQs From: Florin Andrei Reply-To: linux-kernel@vger.kernel.org To: linux-kernel@vger.kernel.org In-Reply-To: References: Content-Type: text/plain Message-Id: <1055716016.2808.33.camel@rivendell.home.local> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.0 (1.4.0-1) Date: 15 Jun 2003 15:26:56 -0700 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1471 Lines: 37 On Fri, 2003-06-13 at 21:37, Mike Dresser wrote: > On 13 Jun 2003, Florin Andrei wrote: > > > This issue may not matter much on "normal" systems, but it matters a > > whole bunch on multimedia machines. Not being able to untangle like five > > or six devices assigned to the same IRQ may render an otherwise powerful > > system totally unusable for any decent media purpose (i'm talking here > > about simple tasks such as watching movies, not necessarily of > > professional stuff, which is even more demanding). > > Some of the problem is that motherboard manufacturers setup their hardware > so that slots HAVE to share IRQ's no matter what you do. I've seen > motherboards that have shared IRQ's even if there are no cards plugged in. I think i see what you mean. Still, then what's the explanation for this thing: if i run a non-APIC kernel, lots of devices are on the same IRQ. Just enable APIC in the kernel, and change nothing else, and the busy IRQ becomes less busy. In either case, there are tons of spare IRQs, which just sit there idle, unused. If the problem would be entirely in hardware, i would say APIC shouldn't make a big difference. Do i miss something? -- Florin Andrei http://florin.myip.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/