Return-path: Received: from mail-ig0-f175.google.com ([209.85.213.175]:53443 "EHLO mail-ig0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751394AbaIJOOp (ORCPT ); Wed, 10 Sep 2014 10:14:45 -0400 Received: by mail-ig0-f175.google.com with SMTP id uq10so6559824igb.2 for ; Wed, 10 Sep 2014 07:14:45 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <54100F0E.8030204@broadcom.com> References: <540FA8D9.2070803@netcommwireless.com> <54100F0E.8030204@broadcom.com> Date: Wed, 10 Sep 2014 16:14:44 +0200 Message-ID: (sfid-20140910_161457_309066_1CE2D3EF) Subject: Re: Not reaching optimum speeds with IEEE 802.11n From: Helmut Schaa To: Arend van Spriel Cc: Sourav , linux-wireless Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: On Wed, Sep 10, 2014 at 10:42 AM, Arend van Spriel wrote: > On 09/10/14 03:26, Sourav wrote: >> We are using Ralink chip Rt3072L (using rt2800usb drivers rt2800usb.c), The Ralink USB hardware is quite bad in reporting TX status and as such minstrel_ht cannot do proper rate selection. If you watch the rc stats at /sys/kernel/debug/ieee80211/phy0/netdev\:wlan0-0/stations/xx:xx:xx:xx:xx:xx/rc_stats you might see a lot of rate selection "hopping". Regards. Helmut