From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755361AbWKMWBj (ORCPT ); Mon, 13 Nov 2006 17:01:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755363AbWKMWBj (ORCPT ); Mon, 13 Nov 2006 17:01:39 -0500 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:23184 "EHLO amd.ucw.cz") by vger.kernel.org with ESMTP id S1755361AbWKMWBj (ORCPT ); Mon, 13 Nov 2006 17:01:39 -0500 Date: Mon, 13 Nov 2006 23:01:27 +0100 From: Pavel Machek To: Mark Lord Cc: Jeff Garzik , Andi Kleen , John Fremlin , kernel list , htejun@gmail.com, jim.kardach@intel.com Subject: Re: AHCI power saving (was Re: Ten hours on X60s) Message-ID: <20061113220127.GA1704@elf.ucw.cz> References: <87k639u55l.fsf-genuine-vii@john.fremlin.org> <20061113142219.GA2703@elf.ucw.cz> <45589008.1080001@garzik.org> <200611131637.56737.ak@suse.de> <455893E5.4010001@garzik.org> <4558B232.8080600@rtr.ca> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4558B232.8080600@rtr.ca> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.11+cvs20060126 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon 2006-11-13 12:58:10, Mark Lord wrote: > Jeff Garzik wrote: > >Andi Kleen wrote: > > > >>How does it shorten its life? > > > >Parks your hard drive heads many thousands of times more often than it > >does without the aggressive PM features. > > Spinning-down would definitely shorten the drive lifespan. Does it do that? Not on my machine. > Parking heads is more like just doing some extra (long) seeks. > Is this documented somewhere as being a life-shortening action? I do not see any effects after applying that patch. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html