iPerf
功能概述
这个示例实现了通用性能测量工具 iPerf 使用的协议。可以在运行此示例的两个 W800 设备之间，或者在单个 W800 设备与运行 iPerf 工具的计算机之间测量性能。
iperf 版本为 3.x， 但本 iperf 示例并不支持标准 iperf 中的所有特性。
环境要求
需要有一个能正常连接的AP。
打印
help以获得命令的概述。设置 Wi-Fi Station 连接。
运行 iperf3 测试 UDP/TCP RX/TX 的吞吐量。
编译和烧录
示例位置：examples/benchmark/iperf
编译、烧录等操作请参考：快速入门
运行结果
成功运行将输出如下日志
__ ____ __ _____ _______ ____ _____ _____ _ _ _
\ \ / / \/ | |_ _| |__ __| / __ \ / ____| / ____| | | | |
\ \ /\ / /| \ / | | | ___ | |______| | | | (___ | (___ | |__ ___| | |
\ \/ \/ / | |\/| | | | / _ \| |______| | | |\___ \ \___ \| '_ \ / _ \ | |
\ /\ / | | | | _| || (_) | | | |__| |____) | ____) | | | | __/ | |
\/ \/ |_| |_| |_____\___/|_| \____/|_____/ |_____/|_| |_|\___|_|_|
W800:
===================================================
| Steps to test WiFi throughput |
| |
| 1. Print 'help' to gain overview of commands |
| 2. Configure device to station or softap |
| 3. Setup WiFi connection |
| 4. Run iperf3 to test UDP/TCP RX/TX throughput |
| |
===================================================
W800:
W800: iperf3 -h
Usage: iperf3 [-s|-c host] [options]
iperf3 [-h|--help] [-v|--version]
Server or Client:
-p, --port # server port to listen on/connect to
-f, --format [kmgtKMGT] format to report: Kbits, Mbits, Gbits, Tbits
-i, --interval # seconds between periodic throughput reports
-I, --pidfile file write PID file
-F, --file name xmit/recv the specified file
-B, --bind <host> bind to the interface associated with the address <host>
-V, --verbose more detailed output
-J, --json output in JSON format
--logfile f send output to a log file
--forceflush force flushing output at every interval
--timestamps<=format> emit a timestamp at the start of each output line
(optional "=" and format string as per strftime(3))
--rcv-timeout # idle timeout for receiving data (default 120000 ms)
-d, --debug[=#] emit debugging output
(optional optional "=" and debug level: 1-4. Default is 4 - all messages)
-v, --version show version information and quit
-h, --help show this message and quit
Server specific:
-s, --server run in server mode
-D, --daemon run the server as a daemon
-1, --one-off handle one client connection then exit
--server-bitrate-limit #[KMG][/#] server's total bit rate limit (default 0 = no limit)
(optional slash and number of secs interval for averaging
total data rate. Default is 5 seconds)
--idle-timeout # restart idle server after # seconds in case it
got stuck (default - no timeout)
Client specific:
-c, --client <host>[%<dev>] run in client mode, connecting to <host>
(option <dev> equivalent to `--bind-dev <dev>`)
-u, --udp use UDP rather than TCP
--connect-timeout # timeout for control connection setup (ms)
-b, --bitrate #[KMG][/#] target bitrate in bits/sec (0 for unlimited)
(default 1 Mbit/sec for UDP, unlimited for TCP)
(optional slash and packet count for burst mode)
--pacing-timer #[KMG] set the timing for pacing, in microseconds (default 1000)
-t, --time # time in seconds to transmit for (default 10 secs)
-n, --bytes #[KMG] number of bytes to transmit (instead of -t)
-k, --blockcount #[KMG] number of blocks (packets) to transmit (instead of -t or -n)
-l, --length #[KMG] length of buffer to read or write
(default 1 KB for TCP, dynamic or 1460 for UDP)
--cport <port> bind to a specific client port (TCP and UDP, default: ephemeral port)
-P, --parallel # number of parallel client streams to run
-R, --reverse run in reverse mode (server sends, client receives)
--bidir run in bidirectional mode.
Client and server send and receive data.
-w, --window #[KMG] set send/receive socket buffer sizes
(indirectly sets TCP window size)
-M, --set-mss # set TCP/SCTP maximum segment size (MTU - 40 bytes)
-N, --no-delay set TCP/SCTP no delay, disabling Nagle's Algorithm
-4, --version4 only use IPv4
-6, --version6 only use IPv6
-S, --tos N set the IP type of service, 0-255.
The usual prefixes for octal and hex can be used,
i.e. 52, 064 and 0x34 all specify the same value.
--dscp N or --dscp val set the IP dscp value, either 0-63 or symbolic.
Numeric values can be specified in decimal,
octal and hex (see --tos above).
-Z, --zerocopy use a 'zero copy' method of sending data
-O, --omit N perform pre-test for N seconds and omit the pre-test statistics
-T, --title str prefix every output line with this string
--extra-data str data string to include in client and server JSON
--get-server-output get results from server
--udp-counters-64bit use 64-bit counters in UDP test packets
--repeating-payload use repeating pattern in payload, instead of
randomized payload (like in iperf2)
[KMG] indicates options that support a K/M/G suffix for kilo-, mega-, or giga-
iperf3 homepage at: https://software.es.net/iperf/
Report bugs to: https://github.com/esnet/iperf
Usage: iperf3 [-s|-c host] [options]
Try `iperf3 --help' for more information.
W800: