Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752899Ab0AYMl2 (ORCPT ); Mon, 25 Jan 2010 07:41:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752294Ab0AYMl2 (ORCPT ); Mon, 25 Jan 2010 07:41:28 -0500 Received: from lucidpixels.com ([75.144.35.66]:43139 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751913Ab0AYMl1 (ORCPT ); Mon, 25 Jan 2010 07:41:27 -0500 Date: Mon, 25 Jan 2010 07:41:25 -0500 (EST) From: Justin Piszcz To: Henrique de Moraes Holschuh cc: Valdis.Kletnieks@vt.edu, linux-kernel@vger.kernel.org Subject: Re: High pitch noise when ACPI processor module is loaded. In-Reply-To: <20100125123311.GC3182@khazad-dum.debian.net> Message-ID: References: <9883.1264397678@localhost> <20100125123311.GC3182@khazad-dum.debian.net> 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: 1607 Lines: 36 On Mon, 25 Jan 2010, Henrique de Moraes Holschuh wrote: > On Mon, 25 Jan 2010, Justin Piszcz wrote: >> So the question remains, is it possible to utilize turbo boost (in Linux) >> without the high pitch noise from the ACPI processor module? > > Well, I am tempted to say you should consider getting a higher quality > motherboard (or, if it is just yours that sing, get it replaced on warranty > as that would mean you got one with bad components). > > That said, if Windows can get that motherboard to shut up, so should Linux. > You just need to find the right knob to push that will make the power draw > behaviour more like whatever Windows is doing. > > The first good bet is to limit core C-state depth, e.g, to C3 (instead of > C5/C6), and if thet doesn't work, to C2. After that, you can try limiting > package C-states if your BIOS will let you (I don't know if we can do that > distinction in Linux right now... do we?), play with cpufreq limiting the > core frequency changes, etc. > > And of course, try all scheduler frequencies, with and without NO_HZ. > > What motherboard is this? Intel's DP55KG Extreme motherboard, yes I will try changing the c-state later and hopefully that will fix the problem, thanks. Again, the board never makes any noise in the BIOS or Windows or Linux, only when you load the cpufreq-processor module. 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/