Date: Tue, 28 Feb 2012 16:39:05 +0200 From: Johann Hugo <jhugo@meraka.csir.co.za> To: freebsd-wireless@freebsd.org Subject: performance in adhoc mode Message-ID: <201202281639.05140.jhugo@meraka.csir.co.za>
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Hi I get lower throuputs in adhoc mode, compared to AP/client mode for the same two devices. Is there anything special that I need to configure in adhoc mode to get the same throughput. AP -> client iperf 27.2 MBytes 28.8 Mbits/sec adhoc -> adhoc iperf 12.1 MBytes 21.3 Mbits/sec The two devices are directly next to each other in the LAB HW platform = Gateworks Avila GW2348-4 Wifi adapters = Compex WLM54AGP23 Atheros driver from +- 10 Jan 2012 OS = FreeBSD 9.0-STABLE ------------------------------------------------------------------------------------------ Adhoc mode: ------------------------------------------------------------------------------------------ Device A - rc.conf: hostname="mesh-2893" wlans_ath0="wlan0" create_args_wlan0="wlanmode adhoc country ZA" ifconfig_wlan0="192.168.1.1/24 mode 11a ssid mesh channel 136 bssid 00:80:48:4f:28:90" Device B - rc.conf: hostname="mesh-2870" wlans_ath0="wlan0" create_args_wlan0="wlanmode adhoc country ZA" ifconfig_wlan0="192.168.1.2/24 mode 11a ssid mesh channel 136 bssid 00:80:48:4f:28:90" mesh-2893:~ # iperf -s ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 64.0 KByte (default) ------------------------------------------------------------ [ 4] local 192.168.1.1 port 5001 connected with 192.168.1.2 port 40262 [ ID] Interval Transfer Bandwidth [ 4] 0.0-10.2 sec 26.0 MBytes 21.3 Mbits/sec mesh-2870:~ # iperf -c 192.168.1.1 ------------------------------------------------------------ Client connecting to 192.168.1.1, TCP port 5001 TCP window size: 32.5 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.1.2 port 40262 connected with 192.168.1.1 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 26.0 MBytes 21.7 Mbits/sec ------------------------------------------------------------------------------------------- AP/client mode: ------------------------------------------------------------------------------------------- Device A - rc.conf: hostname="mesh-2893" wlans_ath0="wlan0" create_args_wlan0="wlanmode hostap country ZA" ifconfig_wlan0="192.168.1.1/24 mode 11a ssid testAP channel 136" Device B - rc.conf: hostname="mesh-2870" wlans_ath0="wlan0" create_args_wlan0="wlanmode sta country ZA" ifconfig_wlan0="192.168.1.2/24 mode 11a ssid testAP" mesh-2893:~ # iperf -s ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 64.0 KByte (default) ------------------------------------------------------------ [ 4] local 192.168.1.1 port 5001 connected with 192.168.1.2 port 45379 [ ID] Interval Transfer Bandwidth [ 4] 0.0-10.1 sec 34.8 MBytes 28.8 Mbits/sec mesh-2870:~ # iperf -c 192.168.1.1 ------------------------------------------------------------ Client connecting to 192.168.1.1, TCP port 5001 TCP window size: 32.5 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.1.2 port 45379 connected with 192.168.1.1 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.1 sec 34.8 MBytes 29.0 Mbits/sec Regards Johann
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