On 16 May 2011 16:26, Sucheta ROY <sucheta....@st.com> wrote: > I have checked in the data rate table at > http://en.wikipedia.org/wiki/IEEE_802.11n-2009 , for a 40MHz channel data > rate is 150 Mbps for MCS 7(Max that AR9285 can support). My question is, - > then how I can see 300Mbps at client side for one set up?
Something is lying to you. The AR9285 can only do one stream so the max @ MCS7, HT40, short-GI is 150MBit. If you're typing: iperf -c <serverip> -u -b 300m -t <timeout> Then iperf on the client-side will tell you how fast it tried transmitting. It'll then tell you how fast the average throughput was at the end of the run by waiting for the server to notify it. If you want to see what's going on with the server, run it as: iperf -s -u -i 1 Then iperf to it and watch what the server says. The server will report exactly what is sent. AS a quick example, on my laptop: cynthia:~ adrian$ iperf -c 10.61.8.2 -ub 300m -i 1 -t 5 ------------------------------------------------------------ Client connecting to 10.61.8.2, UDP port 5001 Sending 1470 byte datagrams UDP buffer size: 9.00 KByte (default) ------------------------------------------------------------ [ 3] local 10.61.8.17 port 56137 connected with 10.61.8.2 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0- 1.0 sec 35.1 MBytes 295 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 1.0- 2.0 sec 35.7 MBytes 300 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 2.0- 3.0 sec 33.6 MBytes 282 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 3.0- 4.0 sec 35.2 MBytes 295 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 4.0- 5.0 sec 35.4 MBytes 297 Mbits/sec [ ID] Interval Transfer Bandwidth [ 3] 0.0- 5.0 sec 175 MBytes 294 Mbits/sec [ 3] Sent 124830 datagrams [ 3] Server Report: [ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams [ 3] 0.0- 5.1 sec 139 MBytes 231 Mbits/sec 0.033 ms 25419/124830 (20%) cynthia:~ adrian$ But on the server I'm iperf'ing to: adrian@kandy:~$ iperf -su -i 1 ------------------------------------------------------------ Server listening on UDP port 5001 Receiving 1470 byte datagrams UDP buffer size: 112 KByte (default) ------------------------------------------------------------ [ 4] local 10.61.8.2 port 5001 connected with 10.61.8.17 port 56137 [ 4] 0.0- 1.0 sec 27.4 MBytes 230 Mbits/sec 0.045 ms 4240/23820 (18%) [ 4] 1.0- 2.0 sec 27.6 MBytes 231 Mbits/sec 0.032 ms 5743/25418 (23%) [ 4] 2.0- 3.0 sec 27.7 MBytes 232 Mbits/sec 0.044 ms 4233/23996 (18%) [ 4] 3.0- 4.0 sec 27.6 MBytes 231 Mbits/sec 0.032 ms 5482/25146 (22%) [ 4] 4.0- 5.0 sec 27.6 MBytes 231 Mbits/sec 0.035 ms 5340/25007 (21%) [ 4] 0.0- 5.1 sec 139 MBytes 231 Mbits/sec 0.033 ms 25419/124830 (20%) I can't help you much more than that at the moment I'm afraid, I have other pressing needs on my time. Good luck! Adrian _______________________________________________ ath9k-devel mailing list ath9k-devel@lists.ath9k.org https://lists.ath9k.org/mailman/listinfo/ath9k-devel
