From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764820AbXGKNOZ (ORCPT ); Wed, 11 Jul 2007 09:14:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763091AbXGKNN5 (ORCPT ); Wed, 11 Jul 2007 09:13:57 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:1591 "EHLO spitz.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1761371AbXGKNNz (ORCPT ); Wed, 11 Jul 2007 09:13:55 -0400 Date: Mon, 9 Jul 2007 19:36:04 +0000 From: Pavel Machek To: Kristen Carlson Accardi Cc: jeff@garzik.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, James.Bottomley@steeleye.com, edwintorok@gmail.com, axboe@kernel.dk, linux-scsi@vger.kernel.org Subject: Re: [patch 2/4] Expose Power Management Policy option to users Message-ID: <20070709193603.GA5722@ucw.cz> References: <20070705194909.337398431@intel.com> <20070705130518.135e4e3c.kristen.c.accardi@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070705130518.135e4e3c.kristen.c.accardi@intel.com> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > This patch will modify the scsi subsystem to allow > users to set a power management policy for the link. > > The scsi subsystem will create a new sysfs file for each > host in /sys/class/scsi_host called "link_power_management_policy". > This file can have 3 possible values: > > Value Meaning > ------------------------------------------------------------------- > min_power User wishes the link to conserve power as much as > possible, even at the cost of some performance > > max_performance User wants priority to be on performance, not power > savings > > medium_power User wants power savings, with less performance cost > than min_power (but less power savings as well). Has that anything to do with HIPM vs. DIPM? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html