Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753274Ab0AYJ4J (ORCPT ); Mon, 25 Jan 2010 04:56:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753177Ab0AYJ4I (ORCPT ); Mon, 25 Jan 2010 04:56:08 -0500 Received: from lucidpixels.com ([75.144.35.66]:59907 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753175Ab0AYJ4E (ORCPT ); Mon, 25 Jan 2010 04:56:04 -0500 Date: Mon, 25 Jan 2010 04:56:02 -0500 (EST) From: Justin Piszcz To: Valdis.Kletnieks@vt.edu cc: linux-kernel@vger.kernel.org Subject: Re: High pitch noise when ACPI processor module is loaded. In-Reply-To: Message-ID: References: <9883.1264397678@localhost> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2174 Lines: 55 On Mon, 25 Jan 2010, Justin Piszcz wrote: > Hi, > > I think something else may be wrong? > > I switched my kernel config to 100 HZ and the problem persists. > > So the question remains, is it possible to utilize turbo boost (in Linux) > without the high pitch noise from the ACPI processor module? > > Again, when the module is not loaded, no matter what HZ, there is no high > pitch noise. > > Justin. > > Without ACPI processor module loaded, turbo boost never takes effect: (turbostat) CPU GHz TSC %c0 %c1 %c3 %c6 %pc3 %pc6 %pc7 0 2.93 2.93 1.41 98.59 0.00 0.00 0.00 0.00 0.00 1 2.93 2.93 100.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2.93 2.93 1.51 98.49 0.00 0.00 0.00 0.00 0.00 3 2.93 2.93 0.97 99.03 0.00 0.00 0.00 0.00 0.00 4 2.93 2.93 0.90 99.10 0.00 0.00 0.00 0.00 0.00 5 2.93 2.93 0.34 99.66 0.00 0.00 0.00 0.00 0.00 6 2.93 2.93 0.40 99.60 0.00 0.00 0.00 0.00 0.00 7 2.93 2.93 3.07 96.93 0.00 0.00 0.00 0.00 0.00 With the module loaded, it works but there is a high pitch noise, again, only under Linux, when the same benchmark (bzip2 a file) is run under windows there is no high pitch noise: CPU GHz TSC %c0 %c1 %c3 %c6 %pc3 %pc6 %pc7 0 3.30 2.93 0.44 0.82 25.29 73.44 0.00 0.00 0.00 1 3.33 2.93 0.24 1.02 25.29 73.44 0.00 0.00 0.00 2 3.43 2.93 1.84 5.41 48.65 44.10 0.00 0.00 0.00 3 3.41 2.93 0.49 6.76 48.65 44.10 0.00 0.00 0.00 4 3.58 2.93 99.44 0.56 0.00 0.00 0.00 0.00 0.00 5 3.43 2.93 0.03 99.97 0.00 0.00 0.00 0.00 0.00 6 3.09 2.93 0.14 0.23 89.74 9.89 0.00 0.00 0.00 7 2.13 2.93 0.01 0.36 89.74 9.89 0.00 0.00 0.00 Justin. -- 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/