Return-path: Received: from mail-wi0-f180.google.com ([209.85.212.180]:39821 "EHLO mail-wi0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932835Ab2LHDhW convert rfc822-to-8bit (ORCPT ); Fri, 7 Dec 2012 22:37:22 -0500 Received: by mail-wi0-f180.google.com with SMTP id hj13so71916wib.1 for ; Fri, 07 Dec 2012 19:37:21 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: From: Thomas Pedersen Date: Fri, 7 Dec 2012 19:37:00 -0800 Message-ID: (sfid-20121208_043728_923113_BEE7F1E0) 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=KOI8-R Sender: linux-wireless-owner@vger.kernel.org List-ID: On Fri, Dec 7, 2012 at 7:23 PM, Georgiewskiy Yuriy wrote: > On 2012-12-07 19:17 -0800, Thomas Pedersen wrote Georgiewskiy Yuriy: > > ??, i try this and report results, can you also test on 2.4 Ggz? as i > understand ch 149 is 802.11a? or this make no sense here? Yes I get similar results on the 2.4Ghz band, and no it shouldn't make a difference here :) > TP>Hi Chaoxing and Georgiewsky, > TP> > TP>On Mon, Dec 3, 2012 at 6:45 AM, Georgiewskiy Yuriy wrote: > TP>> On 2012-12-03 14:37 -0000, Chaoxing Lin wrote linux-wireless@vger.kernel.org: > TP>> > TP>> CL>After a lot of experiments, here are various problems observed. > TP>> CL> > TP>> 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. > TP>> CL>Is anyone looking at this issue? This issue is now very easy to recreate. > TP>> > TP>> In my case it much more than 3%. > TP> > TP>With wireless-testing HEAD (671c924) I made the following observations > TP>with 3 nodes in a mesh using ch. 149 HT20 on AR9280. > TP> > TP>1. ping -i0.1 does not cause aggregation to take place, and losses are 0% > TP>2. a UDP iperf test with two nodes generating traffic shows losses > TP>around 1%. We can observe aggregation taking place in this case. > TP> > TP>Can either of you guys reproduce this with the latest > TP>wireless-testing? Also please CC devel@lists.open80211s.org on any > TP>mesh bugs in the future. > TP> > TP>Thanks! > TP>Thomas > TP>-- > TP>To unsubscribe from this list: send the line "unsubscribe linux-wireless" in > TP>the body of a message to majordomo@vger.kernel.org > TP>More majordomo info at http://vger.kernel.org/majordomo-info.html > TP> > > C ????????? With Best Regards > ???????????? ????. Georgiewskiy Yuriy > +7 4872 711666 +7 4872 711666 > ???? +7 4872 711143 fax +7 4872 711143 > ???????? ??? "?? ?? ??????" IT Service Ltd > http://nkoort.ru http://nkoort.ru > JID: GHhost@icf.org.ru JID: GHhost@icf.org.ru > YG129-RIPE YG129-RIPE