Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1761833AbXFBQkS (ORCPT ); Sat, 2 Jun 2007 12:40:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1759718AbXFBQkI (ORCPT ); Sat, 2 Jun 2007 12:40:08 -0400 Received: from smtp1.linux-foundation.org ([207.189.120.13]:56301 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758574AbXFBQkG (ORCPT ); Sat, 2 Jun 2007 12:40:06 -0400 Date: Sat, 2 Jun 2007 09:39:47 -0700 (PDT) From: Linus Torvalds To: Tear cc: mingo@redhat.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org Subject: Re: [RFC][PATCH] IO-APIC blacklist In-Reply-To: <477357.96605.qm@web63602.mail.re1.yahoo.com> Message-ID: References: <477357.96605.qm@web63602.mail.re1.yahoo.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 Content-Length: 778 Lines: 22 On Sat, 2 Jun 2007, Tear wrote: > > I own a Dell OptiPlex GX240 which, when ACPI is disabled > but IO-APIC is enabled, shows very slow USB performance. > I thought that this could be related to IO-APIC and > tried to boot with "noapic" appended to the kernel > command line. This way the USB transfer speed returned > to normal values. Well, it's almost certainly not the IO-APIC per se. It's more likely to be some irq routing issue, where ACPI fixes up something. Do you have diffs of 'dmesg' with and without ACPI? Linus - 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/