Return-path: Received: from nbd.name ([46.4.11.11]:37659 "EHLO nbd.name" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750881Ab2J3Mni (ORCPT ); Tue, 30 Oct 2012 08:43:38 -0400 Message-ID: <508FCB77.9000303@openwrt.org> (sfid-20121030_134342_384636_690E5192) Date: Tue, 30 Oct 2012 13:43:35 +0100 From: Felix Fietkau MIME-Version: 1.0 To: Simon Wunderlich CC: linux-wireless@vger.kernel.org, ath9k-devel@lists.ath9k.org, linville@tuxdriver.com, mcgrof@qca.qualcomm.com, sven@narfation.org, mathias.kretschmer@fokus.fraunhofer.de, Simon Wunderlich Subject: Re: [PATCH] ath9k: apply coverage class on slottime too References: <1351598855-21427-1-git-send-email-siwu@hrz.tu-chemnitz.de> In-Reply-To: <1351598855-21427-1-git-send-email-siwu@hrz.tu-chemnitz.de> Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: On 2012-10-30 1:07 PM, Simon Wunderlich wrote: > From: Mathias Kretschmer > > According to 802.11-2007 17.3.8.6 (slot time), the slot time should > be increased by 3 us * coverage class. The code only increased the > ack timeout, which is fixed by this patch. > > We have noticed in our long shot scenario that we see less collisions > with this patch. At some point I had the slot time increase in the driver, but noticed a massive throughput degradation on 10-20 km links. Leaving the slot time alone and changing only the ACK timeout fixed this. What distances did you test? - Felix