万兆网络测试iperf与TCP窗口，带宽瓶颈

E:\iperf>iperf3 -c 192.168.0.12 -i 1 -t3 -w 1000k

Connecting to host 192.168.0.12, port 5201

[ 4] local 192.168.0.20 port 60883 connected to 192.168.0.12 port 5201

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-1.00 sec 957 MBytes 8.03 Gbits/sec

[ 4] 1.00-2.00 sec 1.01 GBytes 8.68 Gbits/sec

[ 4] 2.00-3.00 sec 1.02 GBytes 8.76 Gbits/sec

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

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-3.00 sec 2.96 GBytes 8.49 Gbits/sec sender

[ 4] 0.00-3.00 sec 2.96 GBytes 8.49 Gbits/sec receiver

iperf Done.

E:\iperf>iperf3 -c 192.168.0.12 -i 1 -t3 -w 100k

Connecting to host 192.168.0.12, port 5201

[ 4] local 192.168.0.20 port 60886 connected to 192.168.0.12 port 5201

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-1.00 sec 352 MBytes 2.95 Gbits/sec

[ 4] 1.00-2.00 sec 357 MBytes 2.99 Gbits/sec

[ 4] 2.00-3.00 sec 366 MBytes 3.07 Gbits/sec

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

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-3.00 sec 1.05 GBytes 3.01 Gbits/sec sender

[ 4] 0.00-3.00 sec 1.05 GBytes 3.01 Gbits/sec receiver

iperf Done.

E:\iperf>iperf3 -c 192.168.0.12 -i 1 -t3 -w 10k

Connecting to host 192.168.0.12, port 5201

[ 4] local 192.168.0.20 port 60889 connected to 192.168.0.12 port 5201

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-1.00 sec 166 MBytes 1.39 Gbits/sec

[ 4] 1.00-2.00 sec 164 MBytes 1.38 Gbits/sec

[ 4] 2.00-3.00 sec 170 MBytes 1.42 Gbits/sec

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

[ ID] Interval Transfer Bandwidth

[ 4] 0.00-3.00 sec 500 MBytes 1.40 Gbits/sec sender

[ 4] 0.00-3.00 sec 500 MBytes 1.40 Gbits/sec receiver

iperf Done.

E:\iperf>

参考：

TCP速率与窗口，带宽，RTT之间的关系