iperf 带宽测试的结果可靠吗？

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我是电信宽带，刚刚从美国 VPS 服务器向本地发起 iperf UDP 极限测试，以 250Mbps 速率发包，最后结果是 211Mbps 。本地的命令是 iperf -u -s，服务器命令是 iperf -u -c 171.214.***.*** -b 250M -t 10，以下是服务器返回结果：

root@马赛克:~# iperf -u -c 171.214.***.*** -b 250M -t 10
------------------------------------------------------------
Client connecting to 171.214.***.***, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size:  208 KByte (default)
------------------------------------------------------------
[  3] local 107.***.***.157 port 43326 connected with 171.214.***.*** port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec   285 MBytes   239 Mbits/sec
[  3] Sent 203540 datagrams
[  3] Server Report:
[  3]  0.0-10.0 sec   253 MBytes   212 Mbits/sec   0.086 ms 22805/203539 (11%)
[  3]  0.0-10.0 sec  1 datagrams received out-of-order

但是实际使用时达不到这么快。这是怎么回事呢？

Supplement 1 · Oct 31, 2016

以下是 150M 的测试结果（我的宽带是电信 200M 宽带）
```
root@<马赛克>:~# iperf -u -c xxx.xxx -b 150M -t 10
------------------------------------------------------------
Client connecting to xxx.xxx, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 208 KByte (default)
------------------------------------------------------------
[ 3] local 107.***.***.157 port 44933 connected with 171.214.***.** port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-10.0 sec 173 MBytes 145 Mbits/sec
[ 3] Sent 123293 datagrams
[ 3] Server Report:
[ 3] 0.0-10.0 sec 172 MBytes 144 Mbits/sec 0.088 ms 351/123292 (0.28%)
[ 3] 0.0-10.0 sec 1 datagrams received out-of-order
```

7 replies • 2016-12-08 18:59:43 +08:00