From mboxrd@z Thu Jan 1 00:00:00 1970 From: Oliver Neukum Subject: Re: [linux-pm] [RFC] Runtime power management =?iso-8859-1?q?on=09ipw2100?= Date: Wed, 31 Jan 2007 14:12:05 +0100 Message-ID: <200701311412.06213.oneukum@suse.de> References: <20070131075249.GA22115@srcf.ucam.org> <1170244400.6746.31.camel@amit-laptop> <20070131130447.GF19643@elf.ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Cc: Pavel Machek , Amit Kucheria , Matthew Garrett , ipw2100-devel@lists.sourceforge.net, ext Andi Kleen , netdev@vger.kernel.org To: linux-pm@lists.osdl.org Return-path: Received: from mx2.suse.de ([195.135.220.15]:46862 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933226AbXAaNLy (ORCPT ); Wed, 31 Jan 2007 08:11:54 -0500 In-Reply-To: <20070131130447.GF19643@elf.ucw.cz> Content-Disposition: inline Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Am Mittwoch, 31. Januar 2007 14:04 schrieb Pavel Machek: > On Wed 2007-01-31 13:53:20, Amit Kucheria wrote: > > On Wed, 2007-01-31 at 11:48 +0100, ext Andi Kleen wrote: > > > On Wednesday 31 January 2007 11:27, Matthew Garrett wrote: > > > > On Wed, Jan 31, 2007 at 12:13:04PM +0100, Andi Kleen wrote: > > > > > Matthew Garrett writes: > > > > > > > > > > > > PCI seems to require a delay of 10ms when sequencing from D3 to D0, > > > > > > which probably isn't acceptable latency for an "up" state. > > > > > > > > > > It might be if the interface has been idle for some time > > > > > (and the delay is not busy looping of course) > > > > > > > > Hm. How would this interact with receiving packets? > > > > > > The hardware will hopefully have support to wake itself up when that > > > happens. > > > > Yes. Low power states without ability to respond to wakeup interrupts > > would be broken behaviour generally. > > Do you realy expect wifi to save significant ammount of power, while > still listening for packets on wireless network? It has a managed mode which gives each station a timeslot. Outside those slots you could power down, if you can do it quickly. Regards Oliver