From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754327AbZBFAdn (ORCPT ); Thu, 5 Feb 2009 19:33:43 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754736AbZBFAdS (ORCPT ); Thu, 5 Feb 2009 19:33:18 -0500 Received: from yx-out-2324.google.com ([74.125.44.28]:11592 "EHLO yx-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754058AbZBFAdQ (ORCPT ); Thu, 5 Feb 2009 19:33:16 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:newsgroups:to:cc :subject:references:in-reply-to:content-type :content-transfer-encoding; b=HOC8QkD9XVPpbyszPId+5f9YAhyr7signrhxXupTM1lS4TY+XPiuT3N1dDmvTvR3NQ pAZTORYMt21eRZxKzInN9H4WaiwWpJUyJqNp1QiGkYqTzeuKh9AEk/kz/wJsiDPONg97 wxIduBqZ8MMQjy+5PnBcE1udFms4XzvEHVaLw= Message-ID: <498B8547.1010803@gmail.com> Date: Thu, 05 Feb 2009 18:33:11 -0600 From: Robert Hancock User-Agent: Thunderbird 2.0.0.19 (X11/20090105) MIME-Version: 1.0 Newsgroups: gmane.linux.network,gmane.linux.kernel To: Ben Greear CC: linux-kernel , len.brown@intel.com, NetDev Subject: Re: Regression on VIA C3 motherboard, commit: 66f2173e2 References: <498A93E5.2080509@candelatech.com> In-Reply-To: <498A93E5.2080509@candelatech.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Ben Greear wrote: > I have a via motherboard with C3 processor and some real-tek NICs. I > noticed > when using the top-of-tree that performance on it sucked (30Mbps v/s 54Mbps > network throughput in one pertinent test). > > After several hours of bisecting, I see this as the culprit: > > 7b37b5fd9ba32c0c5afc3537eed7e7466f2173e2 is first bad commit > commit 7b37b5fd9ba32c0c5afc3537eed7e7466f2173e2 > Author: Len Brown > Date: Tue Dec 23 01:47:42 2008 -0500 > > ACPI: disable MPS when NO APIC-table found > When ACPI is asked to find an MADT (APIC table) > and fails, then ACPI expects to run in PIC mode. > However, if an MP Table is was found, IRQs will be > registered as if an IOAPIC is being used, even > though ACPI is configuring interrupt links links for PIC mode. > In this scenario, disable MPS so that IRQs > are registered in PIC mode, consistent with ACPI. > http://bugzilla.kernel.org/show_bug.cgi?id=12257 > Signed-off-by: Len Brown > > :040000 040000 86ce74daee3a9fe6ff21ef7f8fb364af23ec0c1e > 364933dfec0df34e63b1aeff6aff4092d421886b M arch > > > In addition, I see this warning in my logs, which is likely the symptom: > > ACPI Exception (tbxface-0627): AE_NO_ACPI_TABLES, While loading > namespace from ACPI tables ] > ACPI: Unable to load the System Description Tables You're getting this on boot: ACPI Error (tbxfroot-0218): A valid RSDP was not found [20080926] That essentially means ACPI isn't working at all, I think. Did previous kernels produce this error? Do you have ACPI disabled in the BIOS or something?