From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Rychter Subject: Re: does cpu_idle() halt CPU? Date: Wed, 02 Apr 2003 09:05:06 +0200 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: References: <20030328150218.D10287@gateway.junsun.net> <20030329134742.GD10287@poup.poupinou.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: In-Reply-To: <20030329134742.GD10287-j6u/t2rXLliUoIHC/UFpr9i2O/JbrIOy@public.gmane.org> (Ducrot Bruno's message of "Sat, 29 Mar 2003 14:47:42 +0100") Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org >>>>> "DB" == Ducrot Bruno : [...] DB> You forgot at least disk activities especially if ext3, which DB> prevent almost all IDE drivers to go to idle state. But that will DB> not explain why you can not go to C3 though. By the way, let me ask here: does anybody know what would be the best filesystem to use on a laptop, power saving being the #1 priority? Are all journaling filesystems this bad? There was a project to teach the Linux kernel about drive spindown and manage drive accesses accordingly -- but last time I saw their docs they said that all journaling filesystems pose serious problems... USB preventing the machine from going into C3 is a serious problem. I still don't understand if that's a hardware thing or can we have a more reasonable HCI implementation that doesn't use DMA that much. How does Windows deal with it? --J. ------------------------------------------------------- This SF.net email is sponsored by: ValueWeb: Dedicated Hosting for just $79/mo with 500 GB of bandwidth! No other company gives more support or power for your dedicated server http://click.atdmt.com/AFF/go/sdnxxaff00300020aff/direct/01/