From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263881AbTEOIqa (ORCPT ); Thu, 15 May 2003 04:46:30 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263886AbTEOIqa (ORCPT ); Thu, 15 May 2003 04:46:30 -0400 Received: from faui3es.informatik.uni-erlangen.de ([131.188.33.16]:57272 "EHLO faui3es.informatik.uni-erlangen.de") by vger.kernel.org with ESMTP id S263881AbTEOIq2 (ORCPT ); Thu, 15 May 2003 04:46:28 -0400 Date: Thu, 15 May 2003 10:59:12 +0200 From: Martin Waitz To: Jens Axboe Cc: Linux Kernel Subject: Re: [PATCH] 2.4 laptop mode Message-ID: <20030515085912.GV1253@admingilde.org> Mail-Followup-To: Jens Axboe , Linux Kernel References: <20030514093504.GE17033@suse.de> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="p/1JFEOz/hVXxMAZ" Content-Disposition: inline In-Reply-To: <20030514093504.GE17033@suse.de> User-Agent: Mutt/1.3.28i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --p/1JFEOz/hVXxMAZ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable hi :) On Wed, May 14, 2003 at 11:35:04AM +0200, Jens Axboe wrote: > Now, this isn't the prettiest patch in the world. But it does allow me > to get good spin down times on my laptop hard drive. It was somewhat > inspired by the 2.5.early version akpm did. Basically, it adds: if you are interested in spinning down hard drives, you might want to read http://www4.informatik.uni-erlangen.de/Publications/pdf/Weissel-Beutel-Bell= osa-OSDI-CoopIO.pdf they describe strategies to get maximum sleep times for drives by bundling accesses to hard discs. they even go a little bit faster and allow user space to give hints about when they need data. i only had a brief look at the sources but i guess this could be folded into the aio interface. (CoopIO as described above adds its own system calls) it would be great if somethink like that could be ported to 2.5... --=20 CU, / Friedrich-Alexander University Erlangen, Germany Martin Waitz // Department of Computer Science 3 _________ ______________/// - - - - - - - - - - - - - - - - - - - - /// dies ist eine manuell generierte mail, sie beinhaltet // tippfehler und ist auch ohne grossbuchstaben gueltig. / --p/1JFEOz/hVXxMAZ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQE+w1bej/Eaxd/oD7IRAmdDAJ9APquzXVKr7LNoc94JKIv0aVyQwwCfYU7q TGyeEdM6NmhX2UjGcpHTh6M= =OvAT -----END PGP SIGNATURE----- --p/1JFEOz/hVXxMAZ--