Return-path: Received: from mail-gy0-f174.google.com ([209.85.160.174]:42390 "EHLO mail-gy0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754752Ab2BMTSf (ORCPT ); Mon, 13 Feb 2012 14:18:35 -0500 Received: by ghrr11 with SMTP id r11so2568437ghr.19 for ; Mon, 13 Feb 2012 11:18:34 -0800 (PST) Message-ID: <4F3961FB.7020409@openwrt.org> (sfid-20120213_201839_276674_5FF7BFB5) Date: Mon, 13 Feb 2012 20:18:19 +0100 From: Florian Fainelli MIME-Version: 1.0 To: Helmut Schaa CC: "linux-wireless@vger.kernel.org" , users@rt2x00.serialmonkey.com, gwingerde@gmail.com, Ivo Van Doorn , Andreas Hartmann Subject: Re: Poor RT2880 performance References: <4F390ED3.8010400@openwrt.org> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: Le 02/13/12 14:45, Helmut Schaa a ?crit : > Hi, > > On Mon, Feb 13, 2012 at 2:23 PM, Florian Fainelli wrote: >> I am playing with a RT2880-F based AP, with a N connected station, in a >> residential environment. > Mind to provide the RF and RT chipset identifications? rt2x00 should print them > out during module load (at least when compiled with debugging options). Sure, here are the HW infos of the AP: Ralink RT2880 id:1 rev:1 running at 266.66 MHz phy0 -> rt2x00_set_chip: Info - Chipset detected - rt: 2860, rf: 0001, rev: 0101. The station is an AR5418 ath9k card 2x2. > >> I could not get more than 26Mbits/sec TCP performance using iperf on both >> sides, > Did aggregation kick in? What rate was selected by the AP? Does it print anything when it does? The station dump gives me: Station 00:1d:7d:45:53:99 (on wlan0) inactive time: 12670 ms rx bytes: 44578225 rx packets: 29117 tx bytes: 1116274 tx packets: 13560 tx retries: 9148 tx failed: 890 signal: -54 dBm signal avg: -53 dBm tx bitrate: 117.0 MBit/s MCS 14 rx bitrate: 130.0 MBit/s MCS 15 authorized: yes authenticated: yes preamble: short WMM/WME: yes MFP: no TDLS peer: no > >> changing to a busier channel even made the performance drop down to >> 5Mbits/sec, and remained like this. > Andreas also reported some issues as soon as the environment gets noisy, > not sure what the root cause for this is :( The original firmware gives me roughly 75Mbits/sec in HT20 and 89/Mbits/sec in HT40+. The CPU is 66% idle during the transfers. -- Florian