Return-path: Received: from smtp.nokia.com ([192.100.105.134]:27166 "EHLO mgw-mx09.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751336AbYJSHYd (ORCPT ); Sun, 19 Oct 2008 03:24:33 -0400 To: "Luis R. Rodriguez" Cc: linux-wireless , "Zhu Yi" Subject: Re: Power saving on mac80211 References: <43e72e890810171810t1c65642g998db601cfe2a390@mail.gmail.com> <87bpxh6t1n.fsf@nokia.com> From: Kalle Valo Date: Sun, 19 Oct 2008 10:24:23 +0300 In-Reply-To: <87bpxh6t1n.fsf@nokia.com> (Kalle Valo's message of "Sun\, 19 Oct 2008 08\:41\:08 +0300") Message-ID: <87y70l59p4.fsf@nokia.com> (sfid-20081019_092443_483129_2042AF58) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-wireless-owner@vger.kernel.org List-ID: Kalle Valo writes: > Luis R. Rodriguez writes: > >> So I wanted to review power saving requirements for mac80211 and see >> who else out there is focusing on this now or *really soon* so we can >> divide and conquer on this. If you are interested please let us know >> so we can coordinate. > > Nokia is very interested about client side PSM. Currently it's only > on/off type, but I would like to see a dynamic version of this there > the PSM will be enabled when the data path has been idle long enough > (eg. 200 ms). I will be sending patches later. Oh, I forgot about beacon filtering. stlc45xx firmware (but no support in driver yet) supports beacon filtering in PSM mode, meaning that the beacons are not delivered to the host (not even DTIM beacons). This improves power consumption because the host CPU is not woken up all the time. I'm sure that stlc4560 isn't the only chip supporting this feature because it's quite essential in low power devices. I have been planning to implement support to mac80211 in the near future. Though don't know yet what is needed, I haven't investigated this at all. -- Kalle Valo