Iperf is a tool to measure maximum TCP bandwidth, allowing the tuning of various parameters and UDP characteristics. Iperf reports bandwidth, delay jitter, data-gram loss.
iperf3 的使用非常簡單，需要兩台電腦，一台作為 server，另一台作為 client，啟動有發送數據，將結果反饋給用戶
iperf3: parameter error - must either be a client (-c) or server (-s)
Usage: iperf [-s|-c host] [options]
iperf [-h|--help] [-v|--version]
Server or Client:
-p, --port # server port to listen on/connect to
-f, --format [kmgKMG] format to report: Kbits, Mbits, KBytes, MBytes
-i, --interval # seconds between periodic bandwidth reports
-F, --file name xmit/recv the specified file
-A, --affinity n/n,m set CPU affinity
-B, --bind <host> bind to a specific interface
-V, --verbose more detailed output
-J, --json output in JSON format
-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
-1, --one-off handle one client connection then exit
Client specific:
-c, --client <host> run in client mode, connecting to <host>
-u, --udp use UDP rather than TCP
-b, --bandwidth #[KMG][/#] target bandwidth in bits/sec (0 for unlimited)
(default 1 Mbit/sec for UDP, unlimited for TCP)
(optional slash and packet count for burst mode)
-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, --len #[KMG] length of buffer to read or write
(default 128 KB for TCP, 8 KB for UDP)
-P, --parallel # number of parallel client streams to run
-R, --reverse run in reverse mode (server sends, client receives)
-w, --window #[KMG] set window size / socket buffer size
-C, --linux-congestion <algo> set TCP congestion control algorithm (Linux only)
-M, --set-mss # set TCP maximum segment size (MTU - 40 bytes)
-N, --nodelay set TCP 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'
-L, --flowlabel N set the IPv6 flow label (only supported on Linux)
-Z, --zerocopy use a 'zero copy' method of sending data
-O, --omit N omit the first n seconds
-T, --title str prefix every output line with this string
--get-server-output get results from server
[KMG] indicates options that support a K/M/G suffix for kilo-, mega-, or giga-
iperf3 homepage at: http://software.es.net/iperf/
Report bugs to: https://github.com/esnet/iperf
[root@localhost ~]# iperf3 -s ----------------------------------------------------------- Server listening on 5201 ----------------------------------------------------------- Accepted connection from 127.0.0.1, port 38188 [ 5] local 127.0.0.1 port 5201 connected to 127.0.0.1 port 38189 [ ID] Interval Transfer Bandwidth [ 5] 0.00-1.00 sec 4.74 GBytes 40.7 Gbits/sec [ 5] 1.00-2.00 sec 5.00 GBytes 43.0 Gbits/sec [ 5] 2.00-3.00 sec 5.00 GBytes 42.9 Gbits/sec [ 5] 3.00-4.00 sec 5.02 GBytes 43.1 Gbits/sec [ 5] 4.00-5.00 sec 5.02 GBytes 43.2 Gbits/sec [ 5] 5.00-6.00 sec 5.02 GBytes 43.1 Gbits/sec [ 5] 6.00-7.00 sec 5.05 GBytes 43.4 Gbits/sec [ 5] 7.00-8.00 sec 5.02 GBytes 43.1 Gbits/sec [ 5] 8.00-9.00 sec 5.08 GBytes 43.6 Gbits/sec [ 5] 9.00-10.00 sec 5.03 GBytes 43.2 Gbits/sec [ 5] 10.00-10.04 sec 196 MBytes 43.3 Gbits/sec - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Retr [ 5] 0.00-10.04 sec 50.2 GBytes 42.9 Gbits/sec 0 sender [ 5] 0.00-10.04 sec 50.2 GBytes 42.9 Gbits/sec receiver ----------------------------------------------------------- Server listening on 5201 -----------------------------------------------------------
輸出JSON格式的報告
[root@localhost ~]# iperf3 -s --json
{
"start": {
"connected": [{
"socket": 5,
"local_host": "127.0.0.1",
"local_port": 5201,
"remote_host": "127.0.0.1",
"remote_port": 38191
}],
"version": "iperf 3.0.11",
"system_info": "Linux localhost.localdomain 3.10.0-327.10.1.el7.x86_64 #1 SMP Tue Feb 16 17:03:50 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux\n",
"timestamp": {
"time": "Fri, 24 Jun 2016 08:12:35 GMT",
"timesecs": 1466755955
},
"accepted_connection": {
"host": "127.0.0.1",
"port": 38190
},
"cookie": "localhost.localdomain.1466755955.214",
"tcp_mss_default": 21888,
"test_start": {
"protocol": "TCP",
"num_streams": 1,
"blksize": 131072,
"omit": 0,
"duration": 10,
"bytes": 0,
"blocks": 0,
"reverse": 0
}
},
"intervals": [{
"streams": [{
"socket": 5,
"start": 0,
"end": 1.00002,
"seconds": 1.00002,
"bytes": 5104271292,
"bits_per_second": 4.08333e+10,
"omitted": false
}],
"sum": {
"start": 0,
"end": 1.00002,
"seconds": 1.00002,
"bytes": 5104271292,
"bits_per_second": 4.08333e+10,
"omitted": false
}
}, {
"streams": [{
"socket": 5,
"start": 1.00002,
"end": 2.00002,
"seconds": 1,
"bytes": 5400688104,
"bits_per_second": 43205504832,
"omitted": false
}],
"sum": {
"start": 1.00002,
"end": 2.00002,
"seconds": 1,
"bytes": 5400688104,
"bits_per_second": 43205504832,
"omitted": false
}
}, {
"streams": [{
"socket": 5,
"start": 2.00002,
"end": 3.00002,
"seconds": 0.999996,
"bytes": 5386797056,
"bits_per_second": 4.30946e+10,
"omitted": false
}],
"sum": {
"start": 2.00002,
"end": 3.00002,
"seconds": 0.999996,
"bytes": 5386797056,
"bits_per_second": 4.30946e+10,
"omitted": false
}
}, {
"streams": [{
"socket": 5,
"start": 3.00002,
"end": 4.00002,
"seconds": 1,
"bytes": 5392957440,
"bits_per_second": 4.31435e+10,
"omitted": false
}],
"sum": {
"start": 3.00002,
"end": 4.00002,
"seconds": 1,
"bytes": 5392957440,
"bits_per_second": 4.31435e+10,
"omitted": false
}
}, {
"streams": [{
"socket": 5,
"start": 4.00002,
"end": 5.00003,
"seconds": 1.00001,
"bytes": 5422972928,
"bits_per_second": 4.33836e+10,
"omitted": false
}],
"sum": {
"start": 4.00002,
"end": 5.00003,
"seconds": 1.00001,
"bytes": 5422972928,
"bits_per_second": 4.33836e+10,
"omitted": false
}
}, {
"streams": [{
"socket": 5,
"start": 5.00003,
"end": 6,
"seconds": 0.999978,
"bytes": 5445845060,
"bits_per_second": 4.35677e+10,
"omitted": false
}],
"sum": {
"start": 5.00003,
"end": 6,
"seconds": 0.999978,
"bytes": 5445845060,
"bits_per_second": 4.35677e+10,
"omitted": false
}
}, {
"streams": [{
"socket": 5,
"start": 6,
"end": 7.00003,
"seconds": 1.00003,
"bytes": 5420875776,
"bits_per_second": 4.33657e+10,
"omitted": false
}],
"sum": {
"start": 6,
"end": 7.00003,
"seconds": 1.00003,
"bytes": 5420875776,
"bits_per_second": 4.33657e+10,
"omitted": false
}
}, {
"streams": [{
"socket": 5,
"start": 7.00003,
"end": 8.00001,
"seconds": 0.999975,
"bytes": 5389877180,
"bits_per_second": 4.31201e+10,
"omitted": false
}],
"sum": {
"start": 7.00003,
"end": 8.00001,
"seconds": 0.999975,
"bytes": 5389877180,
"bits_per_second": 4.31201e+10,
"omitted": false
}
}, {
"streams": [{
"socket": 5,
"start": 8.00001,
"end": 9.00001,
"seconds": 1,
"bytes": 5408030720,
"bits_per_second": 4.32641e+10,
"omitted": false
}],
"sum": {
"start": 8.00001,
"end": 9.00001,
"seconds": 1,
"bytes": 5408030720,
"bits_per_second": 4.32641e+10,
"omitted": false
}
}, {
"streams": [{
"socket": 5,
"start": 9.00001,
"end": 10,
"seconds": 1.00001,
"bytes": 5400166400,
"bits_per_second": 4.32009e+10,
"omitted": false
}],
"sum": {
"start": 9.00001,
"end": 10,
"seconds": 1.00001,
"bytes": 5400166400,
"bits_per_second": 4.32009e+10,
"omitted": false
}
}, {
"streams": [{
"socket": 5,
"start": 10,
"end": 10.0381,
"seconds": 0.0380569,
"bytes": 206635076,
"bits_per_second": 4.34371e+10,
"omitted": false
}],
"sum": {
"start": 10,
"end": 10.0381,
"seconds": 0.0380569,
"bytes": 206635076,
"bits_per_second": 4.34371e+10,
"omitted": false
}
}],
"end": {
"streams": [{
"sender": {
"socket": 5,
"start": 0,
"end": 10.0381,
"seconds": 10.0381,
"bytes": 53979117032,
"bits_per_second": 4.30195e+10,
"retransmits": 0
},
"receiver": {
"socket": 5,
"start": 0,
"end": 10.0381,
"seconds": 10.0381,
"bytes": 53979117032,
"bits_per_second": 4.30195e+10
}
}],
"sum_sent": {
"start": 0,
"end": 10.0381,
"seconds": 10.0381,
"bytes": 53979117032,
"bits_per_second": 4.30195e+10,
"retransmits": 0
},
"sum_received": {
"start": 0,
"end": 10.0381,
"seconds": 10.0381,
"bytes": 53979117032,
"bits_per_second": 4.30195e+10
},
"cpu_utilization_percent": {
"host_total": 19.6287,
"host_user": 0.628708,
"host_system": 19.02,
"remote_total": 99.411,
"remote_user": 1.25979,
"remote_system": 98.226
}
}
}
[root@localhost ~]# iperf3 -c 127.0.0.1 Connecting to host 127.0.0.1, port 5201 [ 4] local 127.0.0.1 port 38189 connected to 127.0.0.1 port 5201 [ ID] Interval Transfer Bandwidth Retr Cwnd [ 4] 0.00-1.00 sec 4.93 GBytes 42.4 Gbits/sec 0 1.19 MBytes [ 4] 1.00-2.00 sec 5.00 GBytes 42.9 Gbits/sec 0 1.19 MBytes [ 4] 2.00-3.00 sec 5.00 GBytes 42.9 Gbits/sec 0 1.19 MBytes [ 4] 3.00-4.00 sec 5.02 GBytes 43.1 Gbits/sec 0 1.19 MBytes [ 4] 4.00-5.00 sec 5.03 GBytes 43.2 Gbits/sec 0 1.19 MBytes [ 4] 5.00-6.00 sec 5.02 GBytes 43.1 Gbits/sec 0 1.19 MBytes [ 4] 6.00-7.00 sec 5.05 GBytes 43.4 Gbits/sec 0 1.19 MBytes [ 4] 7.00-8.00 sec 5.02 GBytes 43.1 Gbits/sec 0 1.81 MBytes [ 4] 8.00-9.00 sec 5.08 GBytes 43.6 Gbits/sec 0 1.81 MBytes [ 4] 9.00-10.00 sec 5.03 GBytes 43.2 Gbits/sec 0 1.81 MBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Retr [ 4] 0.00-10.00 sec 50.2 GBytes 43.1 Gbits/sec 0 sender [ 4] 0.00-10.00 sec 50.2 GBytes 43.1 Gbits/sec receiver iperf Done.