From owner-freebsd-wireless@FreeBSD.ORG Fri Oct 26 12:06:17 2012 Return-Path: Delivered-To: freebsd-wireless@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 637EE2A7; Fri, 26 Oct 2012 12:06:17 +0000 (UTC) (envelope-from jhugo@meraka.csir.co.za) Received: from marge.meraka.csir.co.za (marge.meraka.csir.co.za [146.64.28.1]) by mx1.freebsd.org (Postfix) with ESMTP id D68078FC1B; Fri, 26 Oct 2012 12:06:14 +0000 (UTC) Received: from jeep.localnet (unknown [IPv6:2001:4200:7000:3:223:aeff:fea7:a3c2]) by marge.meraka.csir.co.za (Postfix) with ESMTP id 30BEED0CC15; Fri, 26 Oct 2012 14:06:06 +0200 (SAST) From: Johann Hugo To: Adrian Chadd , freebsd-wireless@freebsd.org Subject: Re: 11n channel width Date: Fri, 26 Oct 2012 14:06:05 +0200 User-Agent: KMail/1.13.7 (FreeBSD/9.0-RELEASE-p3; KDE/4.7.3; amd64; ; ) References: <201210221556.08616.jhugo@meraka.csir.co.za> In-Reply-To: X-KMail-Markup: true MIME-Version: 1.0 Message-Id: <201210261406.05385.jhugo@meraka.csir.co.za> Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Content-Filtered-By: Mailman/MimeDel 2.1.14 X-BeenThere: freebsd-wireless@freebsd.org X-Mailman-Version: 2.1.14 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: Fri, 26 Oct 2012 12:06:17 -0000 On Monday 22 October 2012 16:09:50 you wrote: > On 22 October 2012 06:56, Johann Hugo wrote: > > Hi > > > > What difference in throuput can one expect between ht/20 and a ht/40 ? > > If you're hitting best possible circumstances? Almost 2x. > Is this more or less the troughput what one should expect: a/20 = 29.7 Mbits/sec ht/20 = 40.6 Mbits/sec ht/40 = 44.1 Mbits/sec HW = gateworks ARM OS = FreeBSD 10.0-CURRENT (from 2012/10/11) Build = arm-10-20121011 Wifi = RouterBOARD R52nM = AR9220 ***************************************************************************** mesh-1d04:~ # ifconfig wlan1 channel 28:a/20 mesh-1d04:~ # ifconfig wlan1 wlan1: flags=8843 metric 0 mtu 1500 ether 00:0c:42:6c:61:91 inet 10.50.50.1 netmask 0xffffff00 broadcast 10.50.50.255 inet6 fe80::20c:42ff:fe6c:6191%wlan1 prefixlen 64 scopeid 0x8 inet6 fde4:7b85:9218:10:20c:42ff:fe6c:6191 prefixlen 64 nd6 options=21 media: IEEE 802.11 Wireless Ethernet autoselect mode 11a status: running ssid testAP channel 28 (5140 MHz 11a) bssid 00:0c:42:6c:61:91 regdomain NONE country ZA ecm authmode OPEN privacy OFF txpower 17 mcastrate 6 mgmtrate 6 scanvalid 60 wme burst dtimperiod 1 -dfs mesh-1d04:~ # iperf -c 10.50.50.2 ------------------------------------------------------------ Client connecting to 10.50.50.2, TCP port 5001 TCP window size: 32.5 KByte (default) ------------------------------------------------------------ [ 3] local 10.50.50.1 port 31219 connected with 10.50.50.2 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 35.5 MBytes 29.7 Mbits/sec ***************************************************************************** mesh-1d04:~ # ifconfig wlan1 channel 28:a/20 mesh-1d04:~ # ifconfig wlan1 wlan1: flags=8843 metric 0 mtu 1500 ether 00:0c:42:6c:61:91 inet 10.50.50.1 netmask 0xffffff00 broadcast 10.50.50.255 inet6 fe80::20c:42ff:fe6c:6191%wlan1 prefixlen 64 scopeid 0x8 inet6 fde4:7b85:9218:10:20c:42ff:fe6c:6191 prefixlen 64 nd6 options=21 media: IEEE 802.11 Wireless Ethernet autoselect mode 11na status: running ssid testAP channel 28 (5140 MHz 11a ht/20) bssid 00:0c:42:6c:61:91 regdomain NONE country ZA ecm authmode OPEN privacy OFF txpower 17 mcastrate 6 mgmtrate 6 scanvalid 60 ampdulimit 64k ampdudensity 8 shortgi wme burst dtimperiod 1 -dfs mesh-1d04:~ # iperf -c 10.50.50.2 ------------------------------------------------------------ Client connecting to 10.50.50.2, TCP port 5001 TCP window size: 32.5 KByte (default) ------------------------------------------------------------ [ 3] local 10.50.50.1 port 53324 connected with 10.50.50.2 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.1 sec 48.8 MBytes 40.6 Mbits/sec ***************************************************************************** mesh-1d04:~ # ifconfig wlan1 channel 28:ht/40 wlan1: flags=8843 metric 0 mtu 1500 ether 00:0c:42:6c:61:91 inet 10.50.50.1 netmask 0xffffff00 broadcast 10.50.50.255 inet6 fe80::20c:42ff:fe6c:6191%wlan1 prefixlen 64 scopeid 0x8 inet6 fde4:7b85:9218:10:20c:42ff:fe6c:6191 prefixlen 64 nd6 options=21 media: IEEE 802.11 Wireless Ethernet autoselect mode 11na status: running ssid testAP channel 28 (5140 MHz 11a ht/40-) bssid 00:0c:42:6c:61:91 regdomain NONE country ZA ecm authmode OPEN privacy OFF txpower 17 mcastrate 6 mgmtrate 6 scanvalid 60 ampdulimit 64k ampdudensity 8 shortgi wme burst dtimperiod 1 -dfs mesh-1d04:~ # iperf -c 10.50.50.2 Client connecting to 10.50.50.2, TCP port 5001 TCP window size: 32.5 KByte (default) ------------------------------------------------------------ [ 3] local 10.50.50.1 port 26303 connected with 10.50.50.2 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.1 sec 52.9 MBytes 44.1 Mbits/sec Johann