From owner-freebsd-wireless@FreeBSD.ORG Sat Aug 23 19:23:48 2014 Return-Path: Delivered-To: freebsd-wireless@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id EAD8433B for ; Sat, 23 Aug 2014 19:23:48 +0000 (UTC) Received: from mail-qg0-x22c.google.com (mail-qg0-x22c.google.com [IPv6:2607:f8b0:400d:c04::22c]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id A9E213501 for ; Sat, 23 Aug 2014 19:23:48 +0000 (UTC) Received: by mail-qg0-f44.google.com with SMTP id e89so11619090qgf.17 for ; Sat, 23 Aug 2014 12:23:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=zD1eERdg7gFutZwm2YYE/a2hpx2x7hl1EGzcYp1AD3A=; b=nyqBcRwCq82UOHvVvmplyVepQH4Yf2hQBOL4zhHGFYIyDy9mxaVoMI9MAmfURQOXAW S/7R6C6daoc3IA8ftWVjx2ZuRwCfXchO4kCaCZTyhY/aYWjw4EBYzZbd4lOLhFFa07Ac Rk4ghkl99XA2cTVMlbARQR2TwXegEAFw/uaurep/+vQn4abSVQvRw7HJBTEGmQ9sZ1VL 3BXEvZlSupDal7YerosD8Cip70hlz7GJO2CH684L77KrUSKUtWj/k2aUBHIFqDpwStPQ cU1zaEiOMAidDgqYsjcPlzwm/HPkl8ECEjoH2Y+s+UlaSOnGmE4VGvgW+0yCbNhe1MN/ F0oQ== MIME-Version: 1.0 X-Received: by 10.224.86.5 with SMTP id q5mr20989824qal.36.1408821827712; Sat, 23 Aug 2014 12:23:47 -0700 (PDT) Sender: adrian.chadd@gmail.com Received: by 10.224.39.139 with HTTP; Sat, 23 Aug 2014 12:23:47 -0700 (PDT) In-Reply-To: References: Date: Sat, 23 Aug 2014 12:23:47 -0700 X-Google-Sender-Auth: QBF-cpjfDtkBHl-TFkxkpNEptX8 Message-ID: Subject: Re: iwn: Intel Centrino 6205 bad 11n performance From: Adrian Chadd To: Johannes Dieterich Content-Type: text/plain; charset=UTF-8 Cc: "freebsd-wireless@freebsd.org" X-BeenThere: freebsd-wireless@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: "Discussions of 802.11 stack, tools device driver development." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 Aug 2014 19:23:49 -0000 Please file a PR. I may end up getting around to it. I don't know whether it's 11n TX or 11n RX, but we should really debug it. -a On 23 August 2014 12:19, Johannes Dieterich wrote: > Dear Adrian > > thanks a lot for the suggestion! Removing ht indeed improves the throughput > to 1.7 MB/s. Still far from the maximum of my uplink but sufficient for the > time being and much improved. > > Concerning the non-existing maintainer: does it in this case even make sense > to file a PR? > > Given how common the Intel WLAN NICs (unfortunately) are and how some > notebooks have white lists making a change to e.g. ath impossible, it is a > real bummer that nobody maintains it. Thanks for your work on ath, btw, > those NICs are working great nowadays! > > Thanks again for the help! > > Johannes > > > On Wed, Aug 20, 2014 at 12:30 AM, Adrian Chadd wrote: >> >> Hi, >> >> You can try disabling 11n (ifconfig -ht) but besides that, there's no >> real iwn maintainer or anyone who wants to get really nitty gritty >> into what the driver is doing. So until that happens, I think we're >> short of luck. :( >> >> >> -a >> >> >> On 19 August 2014 12:53, Johannes Dieterich >> wrote: >> > Dear all, >> > >> > I have a Intel Centrino Advanced-N 6205 WLAN NIC in my Thinkpad using >> > iwn. >> > >> > iwn0@pci0:3:0:0: class=0x028000 card=0x13118086 chip=0x00858086 >> > rev=0x34 >> > hdr=0x00 >> > vendor = 'Intel Corporation' >> > device = 'Centrino Advanced-N 6205 [Taylor Peak]' >> > class = network >> > >> > Unfortunately, I only get a rather bad speed using CURRENT (r270098) out >> > of >> > the chip. It is connected to an 11n (on the 2.4 GHz band) network: >> > >> > wlan0: flags=8843 metric 0 mtu >> > 1500 >> > nd6 options=29 >> > media: IEEE 802.11 Wireless Ethernet MCS mode 11ng >> > status: associated >> > ssid XXXXX channel 4 (2427 MHz 11g ht/20) bssid XXXXXXXXXX >> > country US authmode WPA2/802.11i privacy ON deftxkey UNDEF >> > TKIP 2:128-bit txpower 15 bmiss 10 scanvalid 60 bgscan bgscanintvl >> > 300 >> > bgscanidle 250 roam:rssi 7 roam:rate 64 protmode CTS ampdulimit 64k >> > ampdudensity 8 -amsdutx amsdurx shortgi wme roaming MANUAL >> > >> > I get a maximum of 900 KB/s of throughput (both in/out, approximated by >> > copying a large file using scp), within the network and to the outside >> > world. Running SuSE Linux on the notebook allows me to easily saturate >> > my >> > uplink at > 3MB/s, didn't then further check within the network. I get >> > no >> > log messages on FBSD from iwn and I am not located in a particularly >> > noisy >> > neighborhood. >> > >> > The only performance issue I can find with this chip is one old report >> > on >> > Ubuntu (http://ubuntuforums.org/showthread.php?t=1949571), where the 11n >> > seemed to be the culprit in the driver/firmware. Could this be an issue >> > for >> > us as well (firmware problem?)? >> > >> > As my workhorse is FreeBSD, I'd love to fix this issue. How can I >> > further >> > debug this issue and/or provide more data? I know that the status of iwn >> > in >> > FBSD is difficult ATM but maybe there is hope? >> > >> > Best >> > >> > Johannes >> > _______________________________________________ >> > freebsd-wireless@freebsd.org mailing list >> > http://lists.freebsd.org/mailman/listinfo/freebsd-wireless >> > To unsubscribe, send any mail to >> > "freebsd-wireless-unsubscribe@freebsd.org" > >