Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758087AbXFLB7g (ORCPT ); Mon, 11 Jun 2007 21:59:36 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757469AbXFLB71 (ORCPT ); Mon, 11 Jun 2007 21:59:27 -0400 Received: from nz-out-0506.google.com ([64.233.162.232]:18492 "EHLO nz-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757452AbXFLB70 (ORCPT ); Mon, 11 Jun 2007 21:59:26 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:user-agent:mime-version:to:cc:subject:references:in-reply-to:x-enigmail-version:content-type:content-transfer-encoding; b=UEhyUXBI2qqvCDX5LMI8tvxO63r3ut3cffpyvQLhW36XT5cg34c4muvBZxcA/WzGDDak2D3NKUCEgYChOY2rrdSctXcDSWntO2E8kgCPjKa7NtQx1Jn6wbCiyU8FUM3MinFTBLVYIlSUq3jGNa6//TkXslpreySWAjxjLDmXhZQ= Message-ID: <466DFDB5.9030901@gmail.com> Date: Tue, 12 Jun 2007 10:58:13 +0900 From: Tejun Heo User-Agent: Thunderbird 2.0.0.0 (X11/20070326) MIME-Version: 1.0 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 Subject: Re: [patch 0/3] AHCI Link Power Management References: <20070611114600.7fca1c24.kristen.c.accardi@intel.com> In-Reply-To: <20070611114600.7fca1c24.kristen.c.accardi@intel.com> X-Enigmail-Version: 0.95.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 959 Lines: 21 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 - 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/