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%s
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valid options are:
exclude: C(connection) D(data) M(multicast) S(settings) V(server) report
Using default data stream.
will give poor performance. See the Iperf documentation.
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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
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-F, --file name xmit/recv the specified file
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-A, --affinity n/n,m set CPU affinity
-B, --bind <host> bind to the interface associated with the address <host>
-V, --verbose more detailed output
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-J, --json output in JSON format
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--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
(using optional format string as per strftime(3))
-d, --debug emit debugging output
-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
-I, --pidfile file write PID file
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-1, --one-off handle one client connection then exit
--server-bitrate-limit #[KMG][/#] server's total bit rate limit (default 0 = no limit)
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(optional slash and number of secs interval for averaging
total data rate. Default is 5 seconds)
Client specific:
-c, --client <host> run in client mode, connecting to <host>
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-u, --udp use UDP rather than TCP
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--connect-timeout # timeout for control connection setup (ms)
-b, --bitrate #[KMG][/#] target bitrate in bits/sec (0 for unlimited)
(default %d 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 %d 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
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(default %d KB for TCP, dynamic or %d for UDP)
--cport <port> bind to a specific client port (TCP and UDP, default: ephemeral port)
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-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 window size / socket buffer size
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-C, --congestion <algo> set TCP congestion control algorithm (Linux and FreeBSD only)
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-M, --set-mss # set TCP/SCTP maximum segment size (MTU - 40 bytes)
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-N, --no-delay set TCP/SCTP no delay, disabling Nagle's Algorithm
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-4, --version4 only use IPv4
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-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.
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--dscp N or --dscp val set the IP dscp value, either 0-63 or symbolic.
Numeric values can be specified in decimal,
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octal and hex (see --tos above).
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-L, --flowlabel N set the IPv6 flow label (only supported on Linux)
-Z, --zerocopy use a 'zero copy' method of sending data
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-O, --omit N omit the first n seconds
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-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-
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iperf3 homepage at: https://software.es.net/iperf/
Report bugs to: https://github.com/esnet/iperf
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Try `iperf3 --help' for more information.
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