最近移植了Ralink的rt5370的USB wifi 驱动, ld要求测试一下性能,与先前的sdio wifi进行比较。

使用iperf工具。 ierf的用法如下所示:

 

Usage: iperf [-s|-c host] [options]
             iperf [-h|--help] [-v|--version]Client/Server:
   -f, --format    [kmKM]   format to report: Kbits, Mbits, KBytes, MBytes
   -i, --interval  #        seconds between periodic bandwidth reports
   -l, --len       #[KM]    length of buffer to read or write (default 8 KB)
   -m, --print_mss          print TCP maximum segment size (MTU - TCP/IP header)
   -o, --output    <filename> output the report or error message to this specified file
   -p, --port      #        server port to listen on/connect to
   -u, --udp                use UDP rather than TCP
   -w, --window    #[KM]    TCP window size (socket buffer size)
   -B, --bind      <host>   bind to <host>, an interface or multicast address
   -C, --compatibility      for use with older versions does not sent extra msgs
   -M, --mss       #        set TCP maximum segment size (MTU - 40 bytes)
   -N, --nodelay            set TCP no delay, disabling Nagle's Algorithm
   -V, --IPv6Version        Set the domain to IPv6Server specific:
   -s, --server             run in server mode
   -U, --single_udp         run in single threaded UDP mode
   -D, --daemon             run the server as a daemonClient specific:
   -b, --bandwidth #[KM]    for UDP, bandwidth to send at in bits/sec
                            (default 1 Mbit/sec, implies -u)
   -c, --client    <host>   run in client mode, connecting to <host>
   -d, --dualtest           Do a bidirectional test simultaneously
   -n, --num       #[KM]    number of bytes to transmit (instead of -t)
   -r, --tradeoff           Do a bidirectional test individually
   -t, --time      #        time in seconds to transmit for (default 10 secs)
   -F, --fileinput <name>   input the data to be transmitted from a file
   -I, --stdin              input the data to be transmitted from stdin
   -L, --listenport #       port to recieve bidirectional tests back on
   -P, --parallel  #        number of parallel client threads to run
   -T, --ttl       #        time-to-live, for multicast (default 1)
   -Z, --linux-congestion <algo>  set TCP congestion control algorithm (Linux only)Miscellaneous:
   -x, --reportexclude [CDMSV]   exclude C(connection) D(data) M(multicast) S(settings) V(server) reports
   -y, --reportstyle C      report as a Comma-Separated Values
   -h, --help               print this message and quit
   -v, --version            print version information and quit

 

首先板子联网:

arm-linux$ mkdir /etc/Wireless
 arm-linux$ mkdir /etc/Wireless/RT2870STA
 arm-linux$ cp  /mnt/RT2870STA.dat /etc/Wireless/RT2870STA/
 arm-linux$ ifconfig ra0 inet 192.168.1.44 up
 arm-linux$ iwpriv ra0 set SSID="NewNet"
 arm-linux$ route add default gw 192.168.1.1arm-linux$ ping 192.168.1.1
 PING 192.168.1.1 (192.168.1.1): 56 data bytes
 64 bytes from 192.168.1.1: seq=0 ttl=64 time=9.709 ms
 64 bytes from 192.168.1.1: seq=1 ttl=64 time=5.316 ms
 64 bytes from 192.168.1.1: seq=2 ttl=64 time=3.661 ms
 64 bytes from 192.168.1.1: seq=3 ttl=64 time=3.526 ms
 --- 192.168.1.1 ping statistics ---
 4 packets transmitted, 4 packets received, 0% packet loss
 round-trip min/avg/max = 3.526/5.553/9.709 ms

无线AP已经通过RJ45接到公司内网,尝试ping一下内网的linux服务器(11.7.16.108):

arm-linux$ ping 11.7.16.108
PING 11.7.16.108 (11.7.16.108): 56 data bytes
 64 bytes from 11.7.16.108: seq=0 ttl=63 time=10.555 ms
 64 bytes from 11.7.16.108: seq=1 ttl=63 time=3.249 ms
 64 bytes from 11.7.16.108: seq=2 ttl=63 time=3.118 ms
 64 bytes from 11.7.16.108: seq=3 ttl=63 time=3.641 ms
 64 bytes from 11.7.16.108: seq=4 ttl=63 time=6.906 ms
 ^Z[7]+  Stopped                    ping 11.7.16.108

 

OK, 通了,可以使用iperf工具了:

1, 工作电脑(WIN7)通过putty登录11.7.16.108,

$ iperf -s
 ------------------------------------------------------------
 Server listening on TCP port 5001
 TCP window size: 85.3 KByte (default)
 ------------------------------------------------------------ 
2, 开发板
arm-linux$ iperf -c 11.7.16.108
------------------------------------------------------------
 Client connecting to 11.7.16.108, TCP port 5001
 TCP window size: 16.0 KByte (default)
 ------------------------------------------------------------
 [  3] local 192.168.1.44 port 42700 connected with 11.7.16.108 port 5001
 [ ID] Interval       Transfer     Bandwidth
 [  3]  0.0-10.1 sec  10.8 MBytes  8.95 Mbits/sec
 arm-linux$ iperf -c 11.7.16.108 -i 2
 ------------------------------------------------------------
 Client connecting to 11.7.16.108, TCP port 5001
 TCP window size: 16.0 KByte (default)
 ------------------------------------------------------------
 [  3] local 192.168.1.44 port 42701 connected with 11.7.16.108 port 5001
 [ ID] Interval       Transfer     Bandwidth
 [  3]  0.0- 2.0 sec  2.12 MBytes  8.91 Mbits/sec
 [  3]  2.0- 4.0 sec  2.12 MBytes  8.91 Mbits/sec
 [  3]  4.0- 6.0 sec  2.00 MBytes  8.39 Mbits/sec
 [  3]  6.0- 8.0 sec  2.25 MBytes  9.44 Mbits/sec
 [  3]  8.0-10.0 sec  2.25 MBytes  9.44 Mbits/sec
 [  3]  0.0-10.1 sec  10.9 MBytes  9.08 Mbits/sec

 

测出来啦,带宽也就8-9M的样子。

 

 

上面测出来的是TCP的带宽,要测UDP带宽,在客户端要使用-b参数:

使用iperf的-b参数可以指定带宽大小,请注意这个指定的带宽大小并不是我们要测试的网络的带宽,我们测试的网络的带宽是最大值。

要获得带宽数据,需要通过-b不断在client端增加带宽值,直到server端出现轻微的丢包为止,此时server端显示的带宽就是被测系统的吞吐量。

不指定-b参数的话,默认是1M,所以测出来的结果会是1Mbps

 

例如: iperf -c 192.168.1.102 -u -b 5M 执行结果是,只有3Mbps

------------------------------------------------------------
 Client connecting to 192.168.1.100, UDP port 5001
 Sending 1470 byte datagrams
 UDP buffer size: 32.0 KByte (default)
 ------------------------------------------------------------
 [  3] local 192.168.1.104 port 33027 connected with 192.168.1.100 port 5001
 [ ID] Interval       Transfer     Bandwidth
 [  3]  0.0-10.0 sec  3.59 MBytes  3.00 Mbits/sec
 [  3] Sent 2561 datagrams
 [  3] Server Report:
 [  3]  0.0-10.1 sec  3.59 MBytes  2.99 Mbits/sec   7.435 ms    0/ 2560 (0%)
 [  3]  0.0-10.1 sec  1 datagrams received out-of-order

 

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perf是一个网络性能测试工具。可以测试TCP和UDP带宽质量,可以测量最大TCP带宽,具有多种参数和UDP特性,可以报告带宽,延迟抖动和数据包丢失。Iperf在linux和windows平台均有二进制版本供自由使用。


Iperf was developed by NLANRDAST as a modern alternative for measuring maximum TCP and UDP bandwidth performance. Iperf allows the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, datagram loss.


Iperf使用方法与参数说明


参数说明

-s 以server模式启动,eg:iperf -s

-c host以client模式启动,host是server端地址,eg:iperf -c 222.35.11.23


通用参数

-f [kmKM] 分别表示以Kbits, Mbits, KBytes, MBytes显示报告,默认以Mbits为单位,eg:iperf -c 222.35.11.23 -f K

-i sec 以秒为单位显示报告间隔,eg:iperf -c 222.35.11.23 -i 2

-l 缓冲区大小,默认是8KB,eg:iperf -c 222.35.11.23 -l 16

-m 显示tcp最大mtu值

-o 将报告和错误信息输出到文件eg:iperf -c 222.35.11.23 -o ciperflog.txt

-p 指定服务器端使用的端口或客户端所连接的端口eg:iperf -s -p 9999;iperf -c 222.35.11.23 -p 9999

-u 使用udp协议

-w 指定TCP窗口大小,默认是8KB

-B 绑定一个主机地址或接口(当主机有多个地址或接口时使用该参数)

-C 兼容旧版本(当server端和client端版本不一样时使用)

-M 设定TCP数据包的最大mtu值

-N 设定TCP不延时

-V 传输ipv6数据包


server专用参数

-D 以服务方式运行iperf,eg:iperf -s -D

-R 停止iperf服务,针对-D,eg:iperf -s -R


client端专用参数

-d 同时进行双向传输测试

-n 指定传输的字节数,eg:iperf -c 222.35.11.23 -n 100000

-r 单独进行双向传输测试

-t 测试时间,默认10秒,eg:iperf -c 222.35.11.23 -t 5

-F 指定需要传输的文件

-T 指定ttl值


应用实例

使用 iperf -s 命令将 Iperf 启动为 server 模式,在客户机上使用 iperf -c启动client模式。

iperf –s
 ————————————————————
 Server listening on TCP port 5001
 TCP window size: 8.00 KByte (default)
 ————————————————————


iperf -c 59.128.103.56

上面使用服务端和客户端的默认设置进行测试


iperf -s -w 300K
 ————————————————————
 Server listening on TCP port 5001
 TCP window size:  300 KByte
 ————————————————————
 
 iperf -c 59.128.103.56 -f K -i 2 -w 300K 设定报告间隔为2秒,服务器端和客户端的TCP窗口都开到300KB
 
 iperf -c 59.128.103.56 -f K -i 2 -w 300K –n 1000000 测试传输约1MB数据
 
 iperf -c 59.128.103.56 -f K -i 2 -w 300K –t 36 测试持续36秒
 
 iperf -c 59.128.103.56 -f K -i 2 -w 300K -n 10400000 –d 测试双向的传输
 
 iperf -c 59.128.103.56 -f K -i 2 -w 300K –u UDP测试


其中 -i 参数的含义是周期性报告的时间间隔(interval),单位为秒;在上面的例子中,表示每隔2秒报告一次带宽等信息。

 

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