Return-path: Received: from mail.ultra-3eti.com ([173.13.207.162]:42553 "EHLO mail.ultra-3eti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751869Ab2LJPXL convert rfc822-to-8bit (ORCPT ); Mon, 10 Dec 2012 10:23:11 -0500 From: Chaoxing Lin To: Thomas Pedersen , Georgiewskiy Yuriy CC: "linux-wireless@vger.kernel.org" , open11s Subject: RE: help: 802.11s bad performance with 802.11n enabled Date: Mon, 10 Dec 2012 15:23:07 +0000 Message-ID: (sfid-20121210_162314_485689_6553A92F) References: In-Reply-To: Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: Thanks Thomas. TP> With wireless-testing HEAD (671c924) I made the following observations with 3 nodes in a mesh using ch. 149 HT20 on AR9280. 3 nodes may not be enough to see the problem. TP> 1. ping -i0.1 does not cause aggregation to take place, and losses are 0% My tool ping each node (total 7 nodes) at about 10~15 packet/second. Maybe in theory, it should not aggregate. The fact is with/without aggregation, there is a huge difference on ping loss. If you are interested in my test tool, it's here. http://sites.google.com/site/ebaylinkan5709pictures/files-to-share/clinmonitor.gz It's an executable running on any 32-bit Linux. I lost the source code for this tool. Only found the executable in my old machine. TP> 2. a UDP iperf test with two nodes generating traffic shows losses around 1%. We can observe aggregation taking place in this case. For all the kernel versions I have tested, I did not see a problem with two node 802.11s network. Before the stability test, I did fairly extensive on two-node throughput tests and did not any problem on overnight test. 150 ~ 220 Mbps TCP throughput (varied on different atheros 11n chipsets)