Return-path: Received: from mail-wi0-f174.google.com ([209.85.212.174]:62434 "EHLO mail-wi0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932847Ab2LHDRX (ORCPT ); Fri, 7 Dec 2012 22:17:23 -0500 Received: by mail-wi0-f174.google.com with SMTP id hm9so67819wib.1 for ; Fri, 07 Dec 2012 19:17:22 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: From: Thomas Pedersen Date: Fri, 7 Dec 2012 19:17:02 -0800 Message-ID: (sfid-20121208_041730_230983_0D68D6B5) Subject: Re: help: 802.11s bad performance with 802.11n enabled To: Georgiewskiy Yuriy Cc: Chaoxing Lin , "linux-wireless@vger.kernel.org" , open11s Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: Hi Chaoxing and Georgiewsky, On Mon, Dec 3, 2012 at 6:45 AM, Georgiewskiy Yuriy wrote: > On 2012-12-03 14:37 -0000, Chaoxing Lin wrote linux-wireless@vger.kernel.org: > > CL>After a lot of experiments, here are various problems observed. > CL> > CL>1. The "Fail to stop Tx DMA" related issue plays a role. But not the major part. It accounts for about 3% of packet loss in my testbed. > CL>Is anyone looking at this issue? This issue is now very easy to recreate. > > In my case it much more than 3%. With wireless-testing HEAD (671c924) I made the following observations with 3 nodes in a mesh using ch. 149 HT20 on AR9280. 1. ping -i0.1 does not cause aggregation to take place, and losses are 0% 2. a UDP iperf test with two nodes generating traffic shows losses around 1%. We can observe aggregation taking place in this case. Can either of you guys reproduce this with the latest wireless-testing? Also please CC devel@lists.open80211s.org on any mesh bugs in the future. Thanks! Thomas