From owner-freebsd-wireless@FreeBSD.ORG Tue Aug 19 19:53:14 2014 Return-Path: Delivered-To: freebsd-wireless@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 6BD75437 for ; Tue, 19 Aug 2014 19:53:14 +0000 (UTC) Received: from mail-lb0-x235.google.com (mail-lb0-x235.google.com [IPv6:2a00:1450:4010:c04::235]) (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 EAF9B3904 for ; Tue, 19 Aug 2014 19:53:13 +0000 (UTC) Received: by mail-lb0-f181.google.com with SMTP id 10so5830269lbg.40 for ; Tue, 19 Aug 2014 12:53:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=5pus3W2JrdJjK5pRkmhSP/C/vQNcjv8mjcbinPhoQTw=; b=mqB5tyR5hUCCJdScBoFlvSD0I1qbDBRgNMO+SciCeXoCE30GCCD8r+l5r5oEEwoiyL oWFx47myTVY5qA5SzYYtTylyJiNtxR2IzwGR9vna6KTSfj6bmvVmN2krMbelIgpvWl4Z vZCUVtlSRgSfP8jv17BOp2mA40WEGAS2pskEcluOx0wZblN3uRxrsxdv6IaOoCrC/RNu dJsqvYeD/TqrU6eR2U6y0+A1O0JazUhK+ElE28tTQ2wLl2GDu5xuW5q5xvXl9X8vdzfr majt16mKLizcZi7uvnzpjYLKY6uMdzSmM2gzqJ2WWdEZLdtPKOUk12vIO7ZVSUtSIXaf xQBg== MIME-Version: 1.0 X-Received: by 10.112.5.170 with SMTP id t10mr26085795lbt.64.1408477991703; Tue, 19 Aug 2014 12:53:11 -0700 (PDT) Received: by 10.114.29.200 with HTTP; Tue, 19 Aug 2014 12:53:11 -0700 (PDT) Date: Tue, 19 Aug 2014 21:53:11 +0200 Message-ID: Subject: iwn: Intel Centrino 6205 bad 11n performance From: Johannes Dieterich To: freebsd-wireless@freebsd.org Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.18-1 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: Tue, 19 Aug 2014 19:53:14 -0000 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