Return-path: Received: from mout3.freenet.de ([195.4.92.93]:42750 "EHLO mout3.freenet.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750770AbaIJO6R (ORCPT ); Wed, 10 Sep 2014 10:58:17 -0400 Message-ID: <541065D5.1020307@maya.org> (sfid-20140910_165820_746113_7AD0ABDB) Date: Wed, 10 Sep 2014 16:53:09 +0200 From: Andreas Hartmann MIME-Version: 1.0 To: Sourav , linux-wireless@vger.kernel.org Subject: Re: Not reaching optimum speeds with IEEE 802.11n References: <540FA8D9.2070803@netcommwireless.com> In-Reply-To: <540FA8D9.2070803@netcommwireless.com> Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-wireless-owner@vger.kernel.org List-ID: Sourav wrote: > Hi All, > We are using Ralink chip Rt3072L (using rt2800usb drivers rt2800usb.c), > mac80211, and hostapd in our routers. > root:~# lsmod > Module Size Used by Tainted: P > rt2800usb 15371 0 > rt2800lib 74214 1 rt2800usb > rt2x00usb 9718 1 rt2800usb > rt2x00lib 39328 3 rt2800usb,rt2800lib,rt2x00usb > mac80211 266596 3 rt2800lib,rt2x00usb,rt2x00lib > cfg80211 214073 2 rt2x00lib,mac80211 > compat 17406 4 rt2800usb,rt2x00lib,mac80211,cfg80211 > > When we are measuring performance using iperf, we see ~20Mbps, using > Channel 11 of 2.4GHZ, using 802.11n. Known problem of rt2800usb. You might try the original vendor driver[1] if you want to use the device as STA. Are you running this test on ARM? rt2800usb runs *extremely* poor with Raspi, e.g. With the vendor driver rt5572..., I'm getting > 100MBit/s (measured w/ netperf) running at 2.4 GHz and 40 MHz even through reinforced concrete floor using a rt5372 chip, e.g. - even w/ Raspberry Pi. [1] http://www.mediatek.com/en/downloads/ Kind regards, Andreas