From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: [patch 0/3] AHCI Link Power Management Date: Tue, 12 Jun 2007 10:58:13 +0900 Message-ID: <466DFDB5.9030901@gmail.com> References: <20070611114600.7fca1c24.kristen.c.accardi@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from nz-out-0506.google.com ([64.233.162.233]:18363 "EHLO nz-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757461AbXFLB70 (ORCPT ); Mon, 11 Jun 2007 21:59:26 -0400 Received: by nz-out-0506.google.com with SMTP id n1so1471054nzf for ; Mon, 11 Jun 2007 18:59:25 -0700 (PDT) In-Reply-To: <20070611114600.7fca1c24.kristen.c.accardi@intel.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Kristen Carlson Accardi Cc: jeff@garzik.org, james.bottomley@steeleye.com, linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, arjan@linux.intel.com Kristen Carlson Accardi wrote: > Hi, > This series of patches enables Aggressive Link Power Management for AHCI > devices, as documented in the AHCI spec. On my laptop (a Lenovo X60), this > saves me a full watt of power. On other systems, reported power savings > range from .5-1.5 Watts. It has been tested by the kind folks at #powertop > with similar results. Please give it a try and let me know what you think. I'm not sure about this. We need better PM framework to support powersaving in other controllers and some ahcis don't save much when only link power management is used, they need to be turned off completely && I don't think scsi sysfs is the right place to export this interface. -- tejun