From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Donecker Date: Tue, 12 Jun 2012 18:58:51 -0700 Subject: [ath9k-devel] Low throughput AR9280 HT40+ Message-ID: <4FD7F3DB.4020102@ahmct.ucdavis.edu> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ath9k-devel@lists.ath9k.org Hi, I appear to be getting lower throughput than I should be between two single stream adhoc nodes (~78Mbps UDP). Shouldn't I be getting closer to ~128Mbps? Could someone explain why such a high ratio of lost datagrams? When looking through the list the vast majority of people get a very small datagram loss. Hardware: Ubiquity Routerstation (AR7161) Ubiquity SR71-15 (AR9280) OpenWRT r32062 (linux-3.3.8, compat-wireless-2012-05-29) Config: # cat /sys/kernel/debug/ieee80211/phy0/frequency 5785 # cat /sys/kernel/debug/ieee80211/phy0/channel_type ht40+ # cat /sys/kernel/debug/ieee80211/phy0/ath9k/tx_chainmask 0x00000001 # cat /sys/kernel/debug/ieee80211/phy0/ath9k/rx_chainmask 0x00000001 Throughput test: # iperf -c 192.168.11.2 -p 7777 -u -b 150m -t 10 -i 1 ------------------------------------------------------------ Client connecting to 192.168.11.2, UDP port 7777 Sending 1470 byte datagrams UDP buffer size: 160 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.11.1 port 47537 connected with 192.168.11.2 port 7777 [ ID] Interval Transfer Bandwidth [ 3] 0.0- 1.0 sec 15.3 MBytes 128 Mbits/sec [ 3] 1.0- 2.0 sec 15.1 MBytes 126 Mbits/sec [ 3] 2.0- 3.0 sec 15.3 MBytes 128 Mbits/sec [ 3] 3.0- 4.0 sec 15.3 MBytes 128 Mbits/sec [ 3] 4.0- 5.0 sec 15.4 MBytes 129 Mbits/sec [ 3] 5.0- 6.0 sec 15.3 MBytes 129 Mbits/sec [ 3] 6.0- 7.0 sec 15.3 MBytes 128 Mbits/sec [ 3] 7.0- 8.0 sec 15.2 MBytes 128 Mbits/sec [ 3] 8.0- 9.0 sec 15.3 MBytes 128 Mbits/sec [ 3] 0.0-10.0 sec 153 MBytes 128 Mbits/sec [ 3] Sent 108972 datagrams [ 3] Server Report: [ 3] 0.0-10.0 sec 92.9 MBytes 77.8 Mbits/sec 0.243 ms 42715/108973 (39%) # iw dev wlan0 station dump Station 00:15:6d:85:0f:78 (on wlan0) inactive time: 170 ms rx bytes: 102078921 rx packets: 85286 tx bytes: 1412173463 tx packets: 921845 tx retries: 209 tx failed: 0 signal: -56 [-56] dBm signal avg: -55 [-55] dBm tx bitrate: 150.0 MBit/s MCS 7 40Mhz short GI rx bitrate: 150.0 MBit/s MCS 7 40Mhz short GI authorized: yes authenticated: yes preamble: long WMM/WME: yes MFP: no TDLS peer: no Thanks, -Stephen -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.ath9k.org/pipermail/ath9k-devel/attachments/20120612/74d1449d/attachment-0001.htm