From mboxrd@z Thu Jan 1 00:00:00 1970 From: Forest Bond Subject: Re: acpi-cpufreq; Intel Johnstown (Atom N270) Date: Thu, 13 Aug 2009 15:09:02 -0400 Message-ID: <20090813190902.GD9385@alittletooquiet.net> References: <20090813172556.GB9385@alittletooquiet.net> <20090813182908.GC9385@alittletooquiet.net> <20090813190741.GA7808@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="ieNMXl1Fr3cevapt" Return-path: Received: from storm.alittletooquiet.net ([67.23.28.199]:43385 "EHLO storm.alittletooquiet.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752959AbZHMTJC (ORCPT ); Thu, 13 Aug 2009 15:09:02 -0400 Content-Disposition: inline In-Reply-To: <20090813190741.GA7808@redhat.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Dave Jones Cc: linux-acpi@vger.kernel.org --ieNMXl1Fr3cevapt Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi, On Thu, Aug 13, 2009 at 03:07:41PM -0400, Dave Jones wrote: > On Thu, Aug 13, 2009 at 02:29:08PM -0400, Forest Bond wrote: > > Hi, > >=20 > > On Thu, Aug 13, 2009 at 01:25:57PM -0400, Forest Bond wrote: > > > I'm using an Intel Johnstown board with an Atom N270 processor. Per= formance > > > seems to improve dramatically with acpi-cpufreq loaded. This caught= me by > > > surprise. I had assumed that without loading acpi-cpufreq the CPU w= ould be > > > running at its maximum speed all the time. > >=20 > > I ran some tests to get some numbers. My findings indicate that before > > acpi-cpufreq is loaded the CPU is running at 800MHz even though /proc/= cpuinfo > > indicates 1.6GHz. >=20 > if no cpufreq modules have been loaded, the CPU will be running at whatev= er > p-state the BIOS programmed it to start up at. In your case for some reas= on, that's > the 'slow' speed.=20 Okay, that's what I figured. Looks like there's some BIOS settings that may have an effect. I'll play w= ith those. Thanks, Forest --=20 Forest Bond http://www.alittletooquiet.net http://www.pytagsfs.org --ieNMXl1Fr3cevapt Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFKhGTORO4fQQdv5AwRAuMgAJsH/fA4cPTpdlwDEPuLG04R3FbEQQCgsN2E t4c6xj/hqKP6YYekYr+IwfU= =vC0p -----END PGP SIGNATURE----- --ieNMXl1Fr3cevapt--