Return-path: Received: from mail-ew0-f209.google.com ([209.85.219.209]:39646 "EHLO mail-ew0-f209.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752822AbZLTSoA (ORCPT ); Sun, 20 Dec 2009 13:44:00 -0500 Received: by ewy1 with SMTP id 1so5573213ewy.28 for ; Sun, 20 Dec 2009 10:43:58 -0800 (PST) To: andreamrl@tiscali.it Cc: Larry Finger , Florian Zumbiehl , herton@mandriva.com.br, htl10@users.sourceforge.net, linux-wireless@vger.kernel.org Subject: Re: Power consumption of RTL8187 (driver)/recommendations for low-power USB 802.11 adapter? References: <20091218180205.GD2512@florz.florz.dyndns.org> <4B2BC7E3.2050907@lwfinger.net> <20091218185916.GE2512@florz.florz.dyndns.org> <4B2C100A.9000507@lwfinger.net> From: Kalle Valo Date: Sun, 20 Dec 2009 20:43:56 +0200 In-Reply-To: (Andrea Merello's message of "Sat\, 19 Dec 2009 01\:15\:15 +0100") Message-ID: <878wcxzdsj.fsf@purkki.valot.fi> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-wireless-owner@vger.kernel.org List-ID: Andrea Merello writes: > Even if potentially the 802.11 protocol can probably work even without > beacons (even it might seems a contraddiction, I think it is true if > you are NOT using powersave functionality), currently I suspect the > mac80211 wants them in order to calculate network quality (missed > beacon rate) and it might even send more probes (TX is other power > burnt out) if it cannot detect beacons. mac80211 does support beacon filtering, see IEEE80211_HW_BEACON_FILTER for more. > Even worse, even if one will modify the mac80211 in order to live > without beacons, I think it can't be told to the rtl8187 to filter out > beacons. The HW can filter out all management frames, but not only > beacons. Yeah, HW support is needed for this feature. -- Kalle Valo