小巧好用的网络性能测试工具iPerf

作为一个网络工程师经常会遇到这种情况，需要在两点间测试实际可跑带宽。
带宽小的线路可以搭个FTP服务器，或者直接用scp拷文件这种方式，如果线路超过10G以上就不好用了，一方面需要准备大文件，另一方面磁盘的读写性能也影响到测试结果的准确性，这时这个小巧的开源软件就派上用场了。

iPerf是用于主动测量IP网络上最大可承载带宽的工具。它支持调整与时序，缓冲区和协议（TCP，UDP，SCTP与IPv4和IPv6）有关的各种参数。对于每个测试，它都会报告带宽，丢失和其他参数。官方地址https://iperf.fr/

iPerf功能

• TCP和SCTP
  • 测量带宽
  • 报告MSS / MTU大小和观察的读取大小。
  • 通过套接字缓冲区支持TCP窗口大小。
• UDP
  • 客户端可以创建指定带宽的UDP流。
  • 测量数据包丢失
  • 测量延迟抖动
  • 多播能力

跨平台：Windows，Linux，Android，MacOS X，FreeBSD，OpenBSD，NetBSD，VxWorks，Solaris ...基本所有的系统都支持了。软件下载地址https://iperf.fr/iperf-download.php,当前最新版本为iperf3

安装

CentOS 可以直接用 yum install iperf或yum install iperf3安装

使用（我使用的是iperf3）

• TCP模式

服务器端：

[root@10-57-22-228 ~]# iperf3 -s -p 1234 -i 1
-----------------------------------------------------------
Server listening on 1234

客户端：

[root@10-57-22-128 ~]# iperf3 -c 10.57.22.228 -p 1234 -i 1 -t 10
Connecting to host 10.57.22.228, port 1234
[  4] local 10.57.22.128 port 38079 connected to 10.57.22.228 port 1234
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-1.00   sec   112 MBytes   941 Mbits/sec  250    270 KBytes       
[  4]   1.00-2.00   sec   111 MBytes   932 Mbits/sec  305    369 KBytes       
[  4]   2.00-3.00   sec   111 MBytes   933 Mbits/sec  978    259 KBytes       
[  4]   3.00-4.00   sec   111 MBytes   930 Mbits/sec  358    349 KBytes       
[  4]   4.00-5.00   sec   111 MBytes   931 Mbits/sec  654    286 KBytes       
[  4]   5.00-6.00   sec   111 MBytes   933 Mbits/sec  360    354 KBytes       
[  4]   6.00-7.00   sec   111 MBytes   934 Mbits/sec  417    366 KBytes       
[  4]   7.00-8.00   sec   111 MBytes   934 Mbits/sec  696    329 KBytes       
[  4]   8.00-9.00   sec   111 MBytes   931 Mbits/sec  660    209 KBytes       
[  4]   9.00-10.00  sec   110 MBytes   926 Mbits/sec  912    202 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec  1.09 GBytes   932 Mbits/sec  5590             sender
[  4]   0.00-10.00  sec  1.08 GBytes   931 Mbits/sec                  receiver

在tcp模式下，客户端到服务器10.57.22.228上传带宽测试，测试时间为10秒。

[root@10-57-22-128 ~]# iperf3 -c 10.57.22.228 -p 1234  -d -t 10     
send_parameters:
{
        "tcp":  true,
        "omit": 0,
        "time": 10,
        "parallel":     1,
        "len":  131072,
        "client_version":       "3.1.7"
}
Connecting to host 10.57.22.228, port 1234
SNDBUF is 16384, expecting 0
RCVBUF is 87380, expecting 0
Congestion algorithm is cubic
[  4] local 10.57.22.128 port 38112 connected to 10.57.22.228 port 1234
tcpi_snd_cwnd 225 tcpi_snd_mss 1448 tcpi_rtt 2379
[ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
[  4]   0.00-1.00   sec   112 MBytes   940 Mbits/sec  317    318 KBytes       
tcpi_snd_cwnd 187 tcpi_snd_mss 1448 tcpi_rtt 2001
[  4]   1.00-2.00   sec   110 MBytes   923 Mbits/sec  1763    264 KBytes       
tcpi_snd_cwnd 255 tcpi_snd_mss 1448 tcpi_rtt 1908
[  4]   2.00-3.00   sec   109 MBytes   914 Mbits/sec  1741    361 KBytes       
tcpi_snd_cwnd 261 tcpi_snd_mss 1448 tcpi_rtt 2795
[  4]   3.00-4.00   sec   109 MBytes   916 Mbits/sec  1729    369 KBytes       
tcpi_snd_cwnd 198 tcpi_snd_mss 1448 tcpi_rtt 2081
[  4]   4.00-5.00   sec   109 MBytes   917 Mbits/sec  2040    280 KBytes       
tcpi_snd_cwnd 255 tcpi_snd_mss 1448 tcpi_rtt 5058
[  4]   5.00-6.00   sec   106 MBytes   889 Mbits/sec  4096    361 KBytes       
tcpi_snd_cwnd 190 tcpi_snd_mss 1448 tcpi_rtt 2277
[  4]   6.00-7.00   sec   109 MBytes   916 Mbits/sec  2050    269 KBytes       
tcpi_snd_cwnd 255 tcpi_snd_mss 1448 tcpi_rtt 2336
[  4]   7.00-8.00   sec   110 MBytes   919 Mbits/sec  1702    361 KBytes       
tcpi_snd_cwnd 262 tcpi_snd_mss 1448 tcpi_rtt 3349
[  4]   8.00-9.00   sec   108 MBytes   910 Mbits/sec  2175    370 KBytes       
tcpi_snd_cwnd 199 tcpi_snd_mss 1448 tcpi_rtt 3639
send_results
{
        "cpu_util_total":       4.364935,
        "cpu_util_user":        0.135769,
        "cpu_util_system":      4.285394,
        "sender_has_retransmits":       1,
        "congestion_used":      "cubic",
        "streams":      [{
                        "id":   1,
                        "bytes":        1138941776,
                        "retransmits":  23838,
                        "jitter":       0,
                        "errors":       0,
                        "packets":      0
                }]
}
get_results
{
        "cpu_util_total":       5.207115,
        "cpu_util_user":        0.278441,
        "cpu_util_system":      4.931552,
        "sender_has_retransmits":       -1,
        "congestion_used":      "cubic",
        "streams":      [{
                        "id":   1,
                        "bytes":        1137687808,
                        "retransmits":  -1,
                        "jitter":       0,
                        "errors":       0,
                        "packets":      0
                }]
}
[  4]   9.00-10.00  sec   103 MBytes   867 Mbits/sec  6225    281 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  4]   0.00-10.00  sec  1.06 GBytes   911 Mbits/sec  23838             sender
[  4]   0.00-10.00  sec  1.06 GBytes   910 Mbits/sec                  receiver

iperf Done.

进行上下行带宽测试。

更多功能使用Iperf3 --help查看说明