网络质量的指标，主要有以下几个：
A. 带宽(throughput)，网络的吞吐率，端到端之间可以传输的最大速率。
B. 延时(latency)，数据包从本地传输到对端之间需要的时间，一般是来回的时间RTT。中美海底光纤RTT一般在170ms左右。
C. 丢包(loss)，丢包率超过10%以后，网络质量会迅速劣化。
D. 延时抖动(jitter)，如果延时不稳定，忽快忽慢，网络就存在抖动。在VOIP，视频会议等场合，往往声音和图像也会抖动。
视讯直播对这四个指标都很敏感。基于UDP的srt协议直播，在部署前，需要确认网络质量参数。
网络质量测试工具iperf, 可以测试真实载荷下的网络质量，可以测试端到端的网络质量，可以测试一定吞吐率下的丢包、抖动。
iperf网站：https://iperf.fr/iperf-download.php
-b, --bitrate #[KMG][/#] target bitrate in bits/sec (0 for unlimited)
-w, --window #[KMG] set window size / socket buffer size
-u, --udp use UDP rather than TCP
-c, --client <host> run in client mode, connecting to <host>
-s, --server run in server mode
-D, --daemon run the server as a daemon
-d, --dualtestDo a bidirectional test simultaneously // client only
-P, --parallel # number of parallel client threads to run
Source of the IPERF 3 project can be found at /esnet/iperf
Source of the IPERF 2 project can be found at /projects/iperf2/
Source of the IPERF project can be found at /projects/iperf/
git clone git@:esnet/iperf.git
不要用iperf3，直接用iperf2来测。
服务器上启动：# iperf -s -u -p 17029
windows client上面测试：
# iperf2 -u -c 107.150.28.246 -b 800k -i 5 -t 30 -p 17029
# iperf2 -u -c 107.150.28.246 -b 2M -i 5 -t 30 -p 17029
# iperf2 -u -c 107.150.28.246 -b 2.4M -i 5 -t 30 -p 17029
# iperf2 -u -c 107.150.28.246 -b 800k -i 5 -t 30 -p 17029 -P 3
# iperf2 -u -c 107.150.28.246 -b 800k -i 5 -t 30 -p 17029 -P 9
服务器上面生成统计报告：
^C(cmm_owms) [root@usasvr2 iperf2-code]# iperf -s -p 17029 -u
------------------------------------------------------------
Server listening on UDP port 17029
Receiving 1470 byte datagrams
UDP buffer size: 208 KByte (default)
------------------------------------------------------------
[ 3] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 61053 (peer 2.0.14-alpha)
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 3] 0.0-10.0 sec 979 KBytes 799 Kbits/sec 6.481 ms 2/ 684 (0.29%)
[ 4] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 61700 (peer 2.0.14-alpha)
[ 4] 0.0-30.0 sec 7.50 MBytes 2.09 Mbits/sec 3.060 ms 6/ 5353 (0.11%)
[ 3] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 52546 (peer 2.0.14-alpha)
[ 3] 0.0-30.0 sec 8.98 MBytes 2.51 Mbits/sec 2.661 ms 16/ 6423 (0.25%)
[ 4] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 51827 (peer 2.0.14-alpha)
[ 3] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 51825 (peer 2.0.14-alpha)
[ 5] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 51826 (peer 2.0.14-alpha)
[ 4] 0.0-30.0 sec 2.86 MBytes 799 Kbits/sec 4.828 ms 5/ 2044 (0.24%)
[ 5] 0.0-30.0 sec 2.86 MBytes 799 Kbits/sec 5.347 ms 5/ 2044 (0.24%)
[ 3] 0.0-30.0 sec 2.86 MBytes 799 Kbits/sec 5.736 ms 4/ 2044 (0.2%)
[SUM] 0.0-30.0 sec 8.58 MBytes 2.40 Mbits/sec 5.736 ms 14/ 6132 (0.23%)
[ 6] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 58768 (peer 2.0.14-alpha)
[ 5] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 58771 (peer 2.0.14-alpha)
[ 4] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 58774 (peer 2.0.14-alpha)
[ 3] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 58772 (peer 2.0.14-alpha)
[ 7] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 58775 (peer 2.0.14-alpha)
[ 8] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 58767 (peer 2.0.14-alpha)
[ 9] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 58769 (peer 2.0.14-alpha)
[ 10] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 58773 (peer 2.0.14-alpha)
[ 11] local 107.150.28.246 port 17029 connected with 114.108.219.36 port 58770 (peer 2.0.14-alpha)
[ 3] 0.0-30.4 sec 1.25 MBytes 344 Kbits/sec 34.867 ms 1155/ 2044 (57%)
[ 7] 0.0-30.4 sec 1.11 MBytes 307 Kbits/sec 25.823 ms 1249/ 2044 (61%)
[ 9] 0.0-30.4 sec 1.05 MBytes 289 Kbits/sec 29.907 ms 1296/ 2044 (63%)
[ 11] 0.0-30.4 sec 1.11 MBytes 305 Kbits/sec 33.732 ms 1255/ 2044 (61%)
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