iperf3 | Cheatsheet¶

Listening Server¶

iperf3 -s

Speedtest the listening server¶

iperf3 -c listening.server.ip

Run iperf3 in a daemon¶

iperf3 --daemon

Use udp rather then tcp¶

iperf3 --udp

Time in seconds to transmit¶

iperf3 --time 10

Number of bytes to transmit (instead of -t)¶

iperf3 --bytes 10K/M/G

Run test in 10 parallel threads¶

iperf3 -P 10 -c listening.server.ip

Run iperf3 on a custom port¶

iperf3 --port 9090

Report speed in prefered format¶

Kbits, Mbits, Gbits and TBits is available, use uppercase character for specify format, example below

iper3 --format kmgtK/M/G/T

Set seconds between periodic throughput reports¶

iperf3 --interval 10

Write a pidfile when using iperf3¶

iperf --pidfile /var/run/iperf3.pid

xmit or recvieve the specified file¶

iperf3 --file foo.bin

Set CPU affinity¶

iperf3 --affinity n/n,m 

Bind nic interface to use¶

iperf3 --bind [host.on.ip__OR__interfaceNic]

Print report in JSON format¶

iperf3 --json

Run iperf3 in verbose mode¶

iperf3 -V

Force flush output at every interval¶

Format must be set with srftime(3)

iperf3  --forceflush=format

Run with debug mode enable¶

• 1 = lowest
• 4 = max

iperf3 --debug=[1-4]

Print iperf3 version¶

iperf3 --version

RSA private key used to decrypt authentication credentials¶

iperf3 --rsa-private-key-path    

Path to the configuration file containing user credentials¶

iperf3  --authorized-users-path   

Time skew threshold (in seconds) between the server¶

iperf3  --time-skew-threshold     

Set the IPv6 flow label (only supported on Linux)¶

iperf3 --flowlabel N         

Use a 'zero copy' method of sending data¶

iperf3 --zerocopy