Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270745AbUJUPW0 (ORCPT ); Thu, 21 Oct 2004 11:22:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270764AbUJUPVc (ORCPT ); Thu, 21 Oct 2004 11:21:32 -0400 Received: from ipx20189.ipxserver.de ([80.190.249.56]:42630 "EHLO ipx20189.ipxserver.de") by vger.kernel.org with ESMTP id S270745AbUJUPUg (ORCPT ); Thu, 21 Oct 2004 11:20:36 -0400 Date: Thu, 21 Oct 2004 18:18:42 +0300 (EAT) From: Zwane Mwaikambo To: Lee Revell Cc: "Martin J. Bligh" , Andrea Arcangeli , Arjan van de Ven , Hugh Dickins , Andrea Arcangeli , Alan Cox , Chris Wedgwood , LKML , Christoph Hellwig Subject: Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option In-Reply-To: <1098289667.1429.52.camel@krustophenia.net> Message-ID: References: <593560000.1094826651@[10.10.2.4]> <20040910151538.GA24434@devserv.devel.redhat.com> <20040910152852.GC15643@x30.random> <20040910153421.GD24434@devserv.devel.redhat.com> <20040912141701.GA21626@nocona.random> <622230000.1095001434@[10.10.2.4]> <1098289667.1429.52.camel@krustophenia.net> 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 Content-Length: 942 Lines: 21 On Wed, 20 Oct 2004, Lee Revell wrote: > Are these really "priorities" in real life? I am not being facetious, > this is actually a common myth among users, that you will get better > performance by putting the device you care about on a "high priority" > irq or tweaking the priorities in your local APIC. My impression was > that this is pointless because it only determines which interrupt the > CPU sees first if they fire at _exactly_ the same time. Since we allow > interrupt to nest this does not matter in practice, right? Yep, it only affects which vector gets dispatched first in the multiple vectors queued scenario which doesn't really matter with nesting as you noted. Zwane - 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/