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[操作系统]iperf3实践


The basic commands are the same for iperf and iperf3:

SAMPLE IPERF/IPERF3 COMMANDS
Server:
iperf/iperf3 -sStart server on the default port
iperf -s -w 32M -D / iperf3 -s -DStart server with larger TCP window, and in daemon mode
iperf -i1 -u -s -p 5003 / iperf3 -s -p 5003Start UDP server on port 5003, and give 1 sec interval reports
Client
iperf/iperf3 -c remotehost -i 1 -t 30Run a 30 second tests, giving results every 1 second
iperff/iperf3 -c remotehost -i 1 -t 20 -rRun a test from remotehost to localhost
iperf/iperf3 -c remotehost -i 1 -t 20 -w 32M -P 4Run a test with 4 parallel streams, and with a 32M TCP buffer
iperf/iperf3 -c remotehost -u -i 1 -b 200M 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 2Run the test for 2 seconds before collecting results, to allow for TCP slowstart to finish. (Omit mode)
iperf3 -Z -c remotehostUse the sendfile() 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 s2Run tests to multiple interfaces at once, and label the lines to indicate which test is which
iperf3 -c remotehost -JOutput the results in JSON format for easy parsing.
iperf3 -A 4,4 -c remotehostSet the CPU affinity for the sender,receiver (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 that you may be CPU-bound on some hosts, or on 40G/100G NICs. To run parallel stream iperf3 on mutiple cores, use the method shown in the table above.

实践:

 

[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                  receiver
 
iperf Done.
 
[root@CentOS6 iperf-3.1.2]# iperf3 -c 192.168.56.103 -u -i 1 -b 200M
Connecting 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 Datagrams
[  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 Datagrams
[  4]   0.00-10.00  sec   237 MBytes   199 Mbits/sec  0.027 ms  500/30352 (1.6%)  
[  4] Sent 30352 datagrams
 
iperf Done.
 


 

FAQ:

1.Q:[root@CentOS6 iperf-3.1.2]# iperf3 -c 192.168.56.103 -f M -i 2 -w 300K -n 100M -t 30 -diperf3: parameter error - only one test end condition (-t, -n, -k) may be specified
A:去掉-n
2.-d不再是双向,是debug,目前不支持双向,网上一些文章是错的。

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