IPERF(1) NLANR/DAST IPERF(1)
User Manuals User Manuals
APRIL 2008
NAME
iperf - perform network throughput tests
SYNOPSIS
iperf -s [ options ]
iperf -c server [ options ]
iperf -u -s [ options ]
iperf -u -c server [ options ]
DESCRIPTION
iperf is a tool for performing network throughput measurements. It
can test either TCP or UDP throughput. To perform an iperf test the
user must establish both a server (to discard traffic) and a client
(to generate traffic).
GENERAL OPTIONS
-f, --format
[kmKM] format to report: Kbits, Mbits, KBytes, MBytes
-h, --help
print a help synopsis
-i, --interval n
pause n seconds between periodic bandwidth reports
-l, --len n[KM]
set length read/write buffer to n (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 n
set server port to listen on/connect to to n (default 5001)
-u, --udp
use UDP rather than TCP
-w, --window n[KM]
TCP window size (socket buffer size)
-B, --bind <host>
bind to <host>, an interface or multicast address
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IPERF(1) NLANR/DAST IPERF(1)
User Manuals User Manuals
APRIL 2008
-C, --compatibility
for use with older versions does not sent extra msgs
-M, --mss n
set TCP maximum segment size (MTU - 40 bytes)
-N, --nodelay
set TCP no delay, disabling Nagle's Algorithm
-v, --version
print version information and quit
-V, --IPv6Version
Set the domain to IPv6
-x, --reportexclude
[CDMSV] exclude C(connection) D(data) M(multicast) S(settings)
V(server) reports
-y, --reportstyle C|c
if set to C or c report results as CSV (comma separated values)
SERVER SPECIFIC OPTIONS
-s, --server
run in server mode
-U, --single_udp
run in single threaded UDP mode
-D, --daemon
run the server as a daemon
CLIENT SPECIFIC OPTIONS
-b, --bandwidth n[KM]
set target bandwidth to n bits/sec (default 1 Mbit/sec). This
setting requires UDP (-u).
-c, --client <host>
run in client mode, connecting to <host>
-d, --dualtest
Do a bidirectional test simultaneously
-n, --num n[KM]
number of bytes to transmit (instead of -t)
-r, --tradeoff
Do a bidirectional test individually
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IPERF(1) NLANR/DAST IPERF(1)
User Manuals User Manuals
APRIL 2008
-t, --time n
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 n
port to recieve bidirectional tests back on
-P, --parallel n
number of parallel client threads to run
-T, --ttl n
time-to-live, for multicast (default 1)
-Z, --linux-congestion <algo>
set TCP congestion control algorithm (Linux only)
ENVIRONMENT
TCP_WINDOW_SIZE
Controls the size of TCP buffers.
DIAGNOSTICS
This section needs to be filled in.
BUGS
Exit statuses are inconsistent. The threading implementation is
rather heinous.
AUTHORS
Iperf was originally written by Mark Gates and Alex Warshavsky. Man
page and maintence by Jon Dugan <jdugan at x1024 dot net>. Other
contributions from Ajay Tirumala, Jim Ferguson, Feng Qin, Kevin Gibbs,
John Estabrook <jestabro at ncsa.uiuc.edu>, Andrew Gallatin <gallatin
at gmail.com>, Stephen Hemminger <shemminger at linux-foundation.org>
SEE ALSO
http://iperf.sourceforge.net/
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