From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262524AbTE0Coq (ORCPT ); Mon, 26 May 2003 22:44:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262525AbTE0Coq (ORCPT ); Mon, 26 May 2003 22:44:46 -0400 Received: from modemcable204.207-203-24.mtl.mc.videotron.ca ([24.203.207.204]:30595 "EHLO montezuma.mastecende.com") by vger.kernel.org with ESMTP id S262524AbTE0Cop (ORCPT ); Mon, 26 May 2003 22:44:45 -0400 Date: Mon, 26 May 2003 22:45:20 -0400 (EDT) From: Zwane Mwaikambo X-X-Sender: zwane@montezuma.mastecende.com To: William Lee Irwin III cc: Andrew Morton , "" , "" , "" , "" , "" , "" , "" Subject: Re: userspace irq balancer In-Reply-To: <20030527024419.GF8978@holomorphy.com> Message-ID: References: <20030527000639.GA3767@dualathlon.random> <20030526.171527.35691510.davem@redhat.com> <20030527004115.GD3767@dualathlon.random> <20030526.174841.116378513.davem@redhat.com> <20030527015307.GC8978@holomorphy.com> <20030526185920.64e9751f.akpm@digeo.com> <20030527021002.GD8978@holomorphy.com> <20030527024419.GF8978@holomorphy.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 26 May 2003, William Lee Irwin III wrote: > On Mon, May 26, 2003 at 10:15:23PM -0400, Zwane Mwaikambo wrote: > > Ok there are 16 IOAPICs on an 8quad, but really if we start banging on > > that lock someone is doing way too much hardware access... > > It's done to acknowledge every interrupt. Also, there is additional > cost associated with bouncing the lock's cacheline. Bah, determining owning ioapic of an irq would get too ugly, you can have the same irq connected to multiple ioapics so which to lock? Zwane -- function.linuxpower.ca