Iperf3 practice, iperf3

Iperf3 practice, iperf3

The basic commands are the same for iperf and iperf3:

Sample iperf/IPERF3 COMMANDS

Server:
Iperf/iperf3-s	Start server on the default port
Iperf-s-w 32 M-D/iperf3-s-D	Start server with larger TCP window, and in daemon mode
Iperf-i1-u-s-p 5003/iperf3-s-p 5003	Start UDP server on port 5003, and give 1 sec interval reports
Client
Iperf/iperf3-c remotehost-I 1-t 30	Run a 30 second tests, giving results every 1 second
Iperff/iperf3-c remotehost-I 1-t 20-r	Run a test from remotehost to localhost
Iperf/iperf3-c remotehost-I 1-t 20-w 32 M-P 4	Run a test with 4 parallel streams, and with a 32 m tcp buffer
Iperf/iperf3-c remotehost-u-I 1-B 200 M	Run a 200 Mbps UDP test

Iperf3 adds a number of additional features. for example, the-I mode now reports TCP retransmit info (and is on by default), and the verbose mode now gives a lot of useful information on CPU usage, etc. other new options include:

NEW IPERF3 COMMANDS

Client:
Iperf3-c remotehost-I .5-0 2	Run the test for 2 seconds before collecting results, to allow for TCP slowstart to finish. (Omit mode)
Iperf3-Z-c remotehost	UseSendfile() System call for "Zero Copy" mode. This uses much less CPU.
Iperf3-c 192.168.12.12-T s1 & iperf3-c 192.168.12.13-T s2	Run tests to multiple interfaces at once, and label the lines to indicate which test is which
Iperf3-c remotehost-J	Output the results in JSON format for easy parsing.
Iperf3-A, 4-c remotehost	Set the CPU affinity for the sender, Handler Er (cores are numbered from 0). This has the same affect as doing 'numactl-C 4 iperf3 '.
Iperf3-c 10.20.1.20-A2, 2-T "1" &; iperf3-c 10.20.1.20-p 5400-A3, 3-T "2 "&	Run 2 streams on 2 different cores, and label each using the "-T" flag.

Iperf3 thread model

In order to keep the code as simple and maintainable as possible, iperf3 is single threaded. this means that you may be CPU-bound on some hosts, or on 40G/100G memory. to run parallel stream iperf3 on mutiple cores, use the method shown in the table above.

Practice:

 

[Root @ CentOS7 iperf-3.1.2] # iperf3-s

-----------------------------------------------------------

Server listening on 5201

-----------------------------------------------------------

Accepted connection from 192.168.56.106, port 58465

[5] local 192.168.56.103 port 5201 connected to 192.168.56.106 port 58466

[ID] Interval Transfer Bandwidth

[5] 0.00-1.00 sec 49.9 MBytes 418 Mbits/sec

[5] 1.00-2.00 sec 175 MBytes 1.47 Gbits/sec

[5] 2.00-3.00 sec 148 MBytes 1.25 Gbits/sec

[5] 3.00-4.00 sec 164 MBytes 1.38 Gbits/sec

[5] 4.00-5.00 sec 234 MBytes 1.96 Gbits/sec

[5] 5.00-6.00 sec 227 MBytes 1.91 Gbits/sec

[5] 6.00-7.00 sec 222 MBytes 1.86 Gbits/sec

[5] 7.00-8.00 sec 169 MBytes 1.42 Gbits/sec

[5] 8.00-9.00 sec 143 MBytes 1.20 Gbits/sec

[5] 9.00-10.00 sec 226 MBytes 1.90 Gbits/sec

[5] 10.00-11.00 sec 189 MBytes 1.58 Gbits/sec

[5] 11.00-12.00 sec 101 MBytes 850 Mbits/sec

[5] 12.00-13.00 sec 188 MBytes 1.58 Gbits/sec

[5] 13.00-14.00 sec 207 MBytes 1.74 Gbits/sec

[5] 14.00-15.00 sec 215 MBytes 1.81 Gbits/sec

[5] 15.00-16.00 sec 218 MBytes 1.83 Gbits/sec

[5] 16.00-17.00 sec 217 MBytes 1.82 Gbits/sec

[5] 17.00-18.00 sec 217 MBytes 1.82 Gbits/sec

[5] 18.00-19.00 sec 169 MBytes 1.42 Gbits/sec

[5] 19.00-20.00 sec 230 MBytes 1.93 Gbits/sec

[5] 20.00-21.00 sec 228 MBytes 1.91 Gbits/sec

[5] 21.00-22.00 sec 220 MBytes 1.85 Gbits/sec

[5] 22.00-23.00 sec 227 MBytes 1.91 Gbits/sec

[5] 23.00-24.00 sec 231 MBytes 1.94 Gbits/sec

[5] 24.00-25.00 sec 232 MBytes 1.95 Gbits/sec

[5] 25.00-26.00 sec 146 MBytes 1.23 Gbits/sec

[5] 26.00-27.00 sec 200 MBytes 1.67 Gbits/sec

[5] 27.00-28.00 sec 180 MBytes 1.51 Gbits/sec

[5] 28.00-29.00 sec 176 MBytes 1.47 Gbits/sec

[5] 29.00-30.00 sec 170 MBytes 1.43 Gbits/sec

[5] 30.00-31.00 sec 217 MBytes 1.82 Gbits/sec

[5] 31.00-32.00 sec 215 MBytes 1.80 Gbits/sec

[5] 32.00-32.54 sec 116 MBytes 1.79 Gbits/sec

-------------------------

[ID] Interval Transfer Bandwidth

[5] 0.00-32.54 sec 0.00 Bytes 0.00 bits/sec sender

[5] 0.00-32.54 sec 6.12 GBytes 1.62 Gbits/sec receiver

[Root @ CentOS6 iperf-3.1.2] # iperf3-c 192.168.56.103-I 1-t 30 Connecting to host 192.168.56.103, port 5201 [4] local 192.168.56.106 port 58466 connected to 192.168.56.103 port 5201 [ID] Interval Transfer Bandwidth Retr Cwnd [4] 0.00-1.00 sec 59.3 MBytes 497 Mbits/sec 137 181 KBytes [4] 1.00-2.00 sec 214 MBytes 1.80 Gbits/sec 46 211 KBytes [4] 2.00-3.00 sec 129 MBytes 1.08 Gbits/sec 1 74.9 KBytes [4] 3.00-4.00 sec 222 MBytes 1.86 gbits/sec 46 209 KBytes [4] 4.00-5.00 sec 253 MBytes 2.12 Gbits/sec 0 235 KBytes [4] 5.00-6.00 sec 240 MBytes 2.01 Gbits/sec 45 187 KBytes [4] 6.00-7.00 sec 249 MBytes 2.09 Gbits/sec 0 198 KBytes [4] 7.00-8.00 sec 135 MBytes 1.14 Gbits/sec 1 80.6 KBytes [4] 8.00-9.00 sec 210 MBytes 1.77 gbits/sec 46 209 KBytes [4] 9.00-10.00 sec 236 MBytes 1.98 Gbits/sec 0 233 KBytes [4] 10.00-11.00 sec 94.7 MBytes 795 Mbits/sec 92 39.6 KBytes [4] 11.00-12.00 sec 203 MBytes 1.71 Gbits/sec 0 94.7 KBytes [4] 12.00-13.00 sec 225 MBytes 1.89 Gbits/sec 0 122 KBytes [4] 13.00-14.00 sec 235 MBytes 1.97 gbits/sec 0 144 KBytes [4] 14.00-15.00 sec 236 MBytes 1.98 Gbits/sec 0 157 KBytes [4] 15.00-16.00 sec 234 MBytes 1.96 Gbits/sec 0 164 KBytes [4] 16.00-17.00 sec 185 MBytes 1.55 Gbits/sec 46 182 KBytes [4] 17.00-18.00 sec 243 MBytes 2.04 Gbits/sec 0 219 KBytes [4] 18.00-19.00 sec 252 MBytes 2.11 gbits/sec 45 171 KBytes [4] 19.00-20.00 sec 233 MBytes 1.96 Gbits/sec 0 191 KBytes [4] 20.00-21.00 sec 251 MBytes 2.10 Gbits/sec 0 201 KBytes [4] 21.00-22.00 sec 247 MBytes 2.07 Gbits/sec 0 206 KBytes [4] 22.00-23.00 sec 252 MBytes 2.11 Gbits/sec 0 214 KBytes [4] 23.00-24.00 sec 164 MBytes 1.38 gbits/sec 1 66.5 KBytes [4] 24.00-25.00 sec 214 MBytes 1.79 Gbits/sec 0 122 KBytes [4] 25.00-26.00 sec 202 MBytes 1.69 Gbits/sec 0 164 KBytes [4] 26.00-27.00 sec 197 MBytes 1.66 Gbits/sec 0 192 KBytes [4] 27.00-28.00 sec 187 MBytes 1.57 Gbits/sec 1 148 KBytes [4] 28.00-29.00 sec 235 MBytes 1.97 gbits/sec 0 160 KBytes [4] 29.00-30.00 sec 230 MBytes 1.93 Gbits/sec 0 170 KBytes ------------------ ---[ID] Interval Transfer Bandwidth Retr [4] 0.00-30.00 sec 6.12 GBytes 1.75 Gbits/sec 507 sender [4] 0.00-30.00 sec 6.12 GBytes 1.75 Gbits /sec extends er iperf Done. [root @ CentOS6 iperf-3.1.2] # iperf3-c 192.168.56.103-u-I 1-B 200 MConnecting to host 192.168.56.103, port 5201 [4] local 192.168.56.106 port 48953 connected to 192.168.56.103 port 5201 [ID] Interval Transfer Bandwidth Total limit rams [4] 0.00-1.00 sec 22.6 MBytes 189 Mbits/sec 2891 [4] 1.00 -2.00 sec 24.0 MBytes 201 Mbits/sec 3068 [4] 2.00-3.00 sec 23.6 MBytes 198 Mbits/sec 3025 [4] 3.00-4.00 sec 23.8 MBytes 200 Mbits/sec 3043 [4] 4.00-5.00 sec 23.9 MBytes 200 Mbits/sec 3055 [4] 5.00-6.00 sec 23.9 MBytes 200 Mbits/sec 3059 [4] 6.00-7.00 sec 23.7 MBytes 199 Mbits/sec 3038 [4] 7.00-8.00 sec 23.9 MBytes 200 Mbits/sec 3055 [4] 8.00-9.00 sec 23.9 MBytes 200 Mbits/sec 3065 [4] 9.00-10.00 sec 23.9 MBytes 201 Mbits/ sec 3053--[ID] Interval Transfer Bandwidth Jitter Lost/Total limit rams [4] 0.00-10.00 sec 237 MBytes 199 Mbits/sec 0.027 MS 500/30352 (1.6%) [4] Sent 30352 extends rams iperf Done.

 

FAQ:

1. q: [root @ CentOS6 iperf-3.1.2] # iperf3-c 192.168.56.103-f M-I 2-w 300 K-n 100 M-t 30-diperf3: parameter error-only one test end condition (-t,-n,-k) may be specifiedA: Remove-n2.-d is no longer bidirectional, It is debug, and currently it does not support bidirectional, some articles on the Internet are incorrect.

Deprecated flags (currently no plans to support ):

-d, --dualtest           Do a bidirectional test simultaneously-r, --tradeoff           Do a bidirectional test individually-T, --ttl                time-to-live, for multicast (default 1)-x, --reportexclude [CDMSV]   exclude C(connection) D(data) M(multicast)                              S(settings) V(server) reports-y, --reportstyle C      report as a Comma-Separated Values