本文目录

1、官方解释
2、-w参数使用
3、具体参数使用说明

1、官方解释

安装完iperf3 3.13版本后，我们可以通过man iperf3帮助命令看到对-w参数的解释如下：
-w, --window n[KMGT]
set socket buffer size / window size. This value gets sent to the server and used on that side too; on both sides this option sets both the sending and receiving socket buffer sizes. This option can be used to set (indirectly) the maximum TCP window size. Note that on Linux systems, the effective maximum window size is approximately double what is specified by this option (this behavior is not a bug in iperf3 but a “feature” of the Linux kernel, as documented by tcp(7) and socket(7)).

翻译一下：本参数用于设置socket的缓冲区大小或者窗口大小。这个设置值会被发送到服务端并且在服务端也会配置生效；在客户端和服务端，这个参数会去同时设置发送缓冲区与接收缓冲区。这个参数可以用于设置TCP窗口的最大值（间接的）。注意在Linux系统中，配置这个个参数后，生效的最大窗口大小大约是设置值的二倍（这不是iperf3的bug, 这是linux kernel的系统行为，参考TCP(7)和socket(7)）

2、-w参数使用

注意-w这个参数只能在服务端命令行里被输入，但会同时在客户端的接收和发送缓冲区、服务端的接收和发送缓冲区同时设置生效。

不想知道详细过程的，可以 $\color{red}直接看结论$ ：
如果你的测试目标是达到网络的最大速率(最大吞吐量)，那么

$\color{red}使用UDP的话-w参数在不出错的情况下越大越好$
$\color{red}使用TCP的话，除非你明确知道是接收窗口太小导致的吞吐量上不去，否则不要轻易修改-w参数，建议使用-P参数来更好的解决这个问题；如果明确仅仅是窗口不够大引起的那么可以借助-w参数来增大窗口$

详见：使用iperf3对长肥网络进行TCP测试(TCP长肥管道)，如何配置iperf3

3、具体参数使用说明

通过官方说明，我们已经知道了，对于TCP和对于UDP而言-w的意义并不相同，所以下面分成UDP和TCP二部分来说明。

3.1、对于UDP，-w的使用详解：

UDP套接字都有发送缓冲区大小，但实际上不存在UDP发送缓冲区，发送缓冲区大小的实际意义是可写到套接字的UDP数据报的大小上限。应用程序如果写一个大于上限的数据包进套接字，则系统会返回一个发送出错。

影响UDP可发送的报文大小的上限的二个因素：

UDP协议本身，UDP协议中有16位的UDP报文长度，那么UDP报文长度不能超过2^16=65535-20字节的IP头=65515字节。
socket的UDP发送缓存区大小，这个限制了应用层往套接字最大能送的UDP报文的长度， -w只能改变这个（受限于/proc/sys/net/core/wmem_default, /proc/sys/net/core/wmem_max)

注意UDP报文不要发送得太大，太大了受限于MTU, ip会自动产生分片，UDP报文会被分成多个IP报文，一个ip分片丢失，整个UDP报文报废。

我们以UDP单向测试为例（客户端发送---->服务端接收）

客户端：
- 发送缓冲区
  如上所述，-w设置了，客户端发送能用的发送缓冲区大小的实际意义是可写到套接字的UDP数据报的大小上限，这个值不能大于Linux系统定义的最大值，也不能小于Linux系统定义的最小值。
  - 小于最小值时：
    设置会返回成功，但不会生效，直接使用最小值。
  - 大于最大值时：
    因为客户端的-w参数会被同步到服务端，所以当这个设置值>服务端最大值或者这设置值>客户端最大值时，iperf3会报错。
- 接收缓冲区 (单向测试中，对于客户端而言，不会收到数据，所以接收缓冲区的大小没有意义)
  接收缓冲区是有意义的，它可以起到一个缓冲作用，比如当CPU被其它高优先级的任务使用，iperf3短时间内无法从socket接收缓冲区读取数据时，如果缓冲区太小则有可能会产生丢包(接收缓冲区满了之后，接收端UDP协议栈就会把新收到的包直接丢弃)，同样，这个值不能大于Linux系统定义的最大值，也不能小于Linux系统定义的最小值。
  - 小于最小值时：
    设置会返回成功，但不会生效，直接使用最小值。
  - 大于最大值时：
    因为客户端的-w参数会被同步到服务端，所以当这个设置值>服务端最大值或者这设置值>客户端最大值时，iperf3会报错。

服务端：

发送缓冲区(单向测试中，对于服务端而言，不会发送数据，所以发送缓冲区的大小没有意义)
如上所述，-w设置了，客户端发送能用的发送缓冲区大小的实际意义是可写到套接字的UDP数据报的大小上限，这个值不能大于Linux系统定义的最大值，也不能小于Linux系统定义的最小值。
- 小于最小值时：
设置会返回成功，但不会生效，直接使用最小值。
- 大于最大值时：
因为客户端的-w参数会被同步到服务端，所以当这个设置值>服务端最大值或者这设置值>客户端最大值时，iperf3会报错。
- 接收缓冲区
  接收缓冲区是有意义的，它可以起到一个缓冲作用，比如当CPU被其它高优先级的任务使用，iperf3短时间内无法从socket接收缓冲区读取数据时，如果缓冲区太小则有可能会产生丢包(接收缓冲区满了之后，接收端UDP协议栈就会把新收到的包直接丢弃)，如果缓冲区足够大，那么在有这样的情况发生时，缓冲区可以先把收到的报文缓存下来等待iperf3回来后处理，而不至于直接产生丢包。同样，这个值不能大于Linux系统定义的最大值，也不能小于Linux系统定义的最小值。
  - 小于最小值时：
    设置会返回成功，但不会生效，直接使用最小值。
  - 大于最大值时：
    因为客户端的-w参数会被同步到服务端，所以当这个设置值>服务端最大值或者这设置值>客户端最大值时，iperf3会报错。

结论：使用UDP的话-w参数在不出错的情况下越大越好

3.1.1、如何查看Linux系统定义的UDP的发送、接收缓冲区的最小值

如何查看Linux系统定义发送接收缓冲区的最小值：
通过打开-d选项，设置一个很小的-w, 比如 -w 256 可以看到如下打印

客户端最小的发送缓冲区为4608，接收缓冲区为2304


xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -u -b 10M -w 256 -d
send_parameters:
{
    
    
        "udp":  true,
        "omit": 0,
        "time": 10,
        "parallel":     1,
        "window":       256,
        "len":  1448,
        "bandwidth":    10000000,
        "pacing_timer": 1000,
        "client_version":       "3.9"
}
Connecting to host 192.168.3.60, port 5201
SNDBUF is 4608, expecting 256
RCVBUF is 2304, expecting 256
Setting application pacing to 1250000
[  5] local 192.168.3.107 port 39954 connected to 192.168.3.60 port 5201

服务端最小的发送缓冲区为4480，接收缓冲区为2240

pi@raspberrypi:~ $ iperf3 -s -A 2 -d
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
get_parameters:
{
    
    
        "udp":  true,
        "omit": 0,
        "time": 10,
        "parallel":     1,
        "window":       256,
        "len":  1448,
        "bandwidth":    10000000,
        "pacing_timer": 1000,
        "client_version":       "3.9"
}
Accepted connection from 192.168.3.107, port 37692
SNDBUF is 4480, expecting 256
RCVBUF is 2240, expecting 256
Setting application pacing to 1250000
[  5] local 192.168.3.60 port 5201 connected to 192.168.3.107 port 39954

3.1.2、如何查看Linux系统定义的UDP的发送、接收缓冲区的最大值

客户端


xxx@xxx-pc:~$ sudo cat /proc/sys/net/core/rmem_max
212992
xxx@xxx-pc:~$ sudo cat /proc/sys/net/core/wmem_max
212992

服务端

pi@raspberrypi:~ $ sudo cat /proc/sys/net/core/wmem_max
180224
pi@raspberrypi:~ $ sudo cat /proc/sys/net/core/rmem_max
180224

3.2、对于TCP，-w的使用详解：

从文章使用iperf3对长肥网络进行TCP测试(TCP长肥管道)，如何配置iperf3中我们知道-w参数可以用来扩大接收窗口，用于解决TCP长肥管道中TCP流速度打不上去的问题。

3.2.1、测试环境：

客户端用的是8核i8的x86机器，单核主频为4.0Ghz，而服务端使用的是树莓派4B，单核主频为1G的ARM A53 CPU下，通过一个千兆的交换机直接连接，我们可以看到二个主机之间的带宽是1Gbps, RTT大约是0.2ms。在这样的网络下，我们直接使用默认参数进行TCP测试，如下所示可以达到940Mbps，此时服务端CPU2已经几乎达到100%了，说明受限于CPU处理能力，940Mbps基本上就是TCP的极速了。

-客户端测试命令：

xxx@xxx-pc:~$ ping 192.168.3.60
PING 192.168.3.60 (192.168.3.60) 56(84) bytes of data.
64 bytes from 192.168.3.60: icmp_seq=1 ttl=64 time=0.150 ms
64 bytes from 192.168.3.60: icmp_seq=2 ttl=64 time=0.192 ms
64 bytes from 192.168.3.60: icmp_seq=3 ttl=64 time=0.206 ms
64 bytes from 192.168.3.60: icmp_seq=4 ttl=64 time=0.219 ms
64 bytes from 192.168.3.60: icmp_seq=5 ttl=64 time=0.195 ms
64 bytes from 192.168.3.60: icmp_seq=6 ttl=64 time=0.214 ms
64 bytes from 192.168.3.60: icmp_seq=7 ttl=64 time=0.202 ms
^C
--- 192.168.3.60 ping statistics ---
7 packets transmitted, 7 received, 0% packet loss, time 6135ms
rtt min/avg/max/mdev = 0.150/0.196/0.219/0.021 ms

xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 58330 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   114 MBytes   955 Mbits/sec    0    390 KBytes
[  5]   1.00-2.00   sec   112 MBytes   942 Mbits/sec    0    390 KBytes
[  5]   2.00-3.00   sec   112 MBytes   942 Mbits/sec    0    390 KBytes
[  5]   3.00-4.00   sec   112 MBytes   942 Mbits/sec    0    390 KBytes
[  5]   4.00-5.00   sec   112 MBytes   942 Mbits/sec    0    390 KBytes
[  5]   5.00-6.00   sec   112 MBytes   942 Mbits/sec    0    390 KBytes
[  5]   6.00-7.00   sec   112 MBytes   942 Mbits/sec    0    390 KBytes
[  5]   7.00-8.00   sec   112 MBytes   942 Mbits/sec    0    390 KBytes
[  5]   8.00-9.00   sec   112 MBytes   936 Mbits/sec    0    390 KBytes
[  5]   9.00-10.00  sec   112 MBytes   942 Mbits/sec    0    390 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  1.10 GBytes   943 Mbits/sec    0             sender
[  5]   0.00-10.02  sec  1.10 GBytes   939 Mbits/sec                  receiver

iperf Done.

服务端测试命令：

pi@raspberrypi:~ $ iperf3 -s -A 2
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.3.107, port 54922
[  5] local 192.168.3.60 port 5201 connected to 192.168.3.107 port 54924
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   110 MBytes   919 Mbits/sec
[  5]   1.00-2.00   sec   112 MBytes   941 Mbits/sec
[  5]   2.00-3.00   sec   112 MBytes   941 Mbits/sec
[  5]   3.00-4.00   sec   112 MBytes   941 Mbits/sec
[  5]   4.00-5.00   sec   112 MBytes   941 Mbits/sec

服务端CPU占用率：

3.2.2、模拟TCP长肥管道的测试过程

我们用netem依次来来模拟一个来100ms回100ms来回共200ms的传播延时，带宽为1Gbps的长肥网络

有服务端输入命令：

root@raspberrypi:/home/pi# tc qdisc add dev eth0 root netem delay 100ms
root@raspberrypi:/home/pi#

在客户端输入命令：

root@xxx-pc:/home/xxx# tc qdisc add dev enp2s0 root netem delay 100ms
root@xxx-pc:/home/xxx# ping 192.168.3.60
PING 192.168.3.60 (192.168.3.60) 56(84) bytes of data.
64 bytes from 192.168.3.60: icmp_seq=1 ttl=64 time=200 ms
64 bytes from 192.168.3.60: icmp_seq=2 ttl=64 time=200 ms
64 bytes from 192.168.3.60: icmp_seq=3 ttl=64 time=200 ms
^C
--- 192.168.3.60 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2003ms
rtt min/avg/max/mdev = 200.252/200.279/200.299/0.019 ms

我们通过ping命令可以看到RTT已经是200ms.

3.3.3 长肥网络中TCP的测试结果

我们可以看到，使用默认参数，TCP的速率很低，经过最初3秒中的慢启动爬坡后，速率最终稳定在105Mbps，远没有达到带宽的理论值 1Gbps，此时处理能力弱的服务端的CPU2的占用率还是很低的约为15%，说明不是CPU处理能力限制了带宽，而是TCP长肥管道限制了速率。

客户端：


root@xxx-pc:/home/wangsheng# /usr/bin/iperf3 -c 192.168.3.60 -t 10
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 45868 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   740 KBytes  6.06 Mbits/sec    0    113 KBytes
[  5]   1.00-2.00   sec  6.18 MBytes  51.9 Mbits/sec    0   3.51 MBytes
[  5]   2.00-3.00   sec  12.5 MBytes   105 Mbits/sec    0   4.95 MBytes
[  5]   3.00-4.00   sec  12.5 MBytes   105 Mbits/sec    0   4.95 MBytes
[  5]   4.00-5.00   sec  11.2 MBytes  94.4 Mbits/sec    0   4.95 MBytes
[  5]   5.00-6.00   sec  12.5 MBytes   105 Mbits/sec    0   4.95 MBytes
[  5]   6.00-7.00   sec  12.5 MBytes   105 Mbits/sec    0   4.95 MBytes
[  5]   7.00-8.00   sec  12.5 MBytes   105 Mbits/sec    0   4.95 MBytes
[  5]   8.00-9.00   sec  12.5 MBytes   105 Mbits/sec    0   4.95 MBytes
[  5]   9.00-10.00  sec  12.5 MBytes   105 Mbits/sec    0   4.95 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec   106 MBytes  88.6 Mbits/sec    0             sender
[  5]   0.00-10.20  sec   105 MBytes  86.1 Mbits/sec                  receiver

iperf Done.

服务端：


-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from 192.168.3.107, port 45854
[  5] local 192.168.3.60 port 5201 connected to 192.168.3.107 port 45868
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec  99.0 KBytes   811 Kbits/sec
[  5]   1.00-2.00   sec  3.40 MBytes  28.5 Mbits/sec
[  5]   2.00-3.00   sec  12.4 MBytes   104 Mbits/sec
[  5]   3.00-4.00   sec  12.4 MBytes   104 Mbits/sec
[  5]   4.00-5.00   sec  12.4 MBytes   104 Mbits/sec
[  5]   5.00-6.00   sec  12.4 MBytes   104 Mbits/sec
[  5]   6.00-7.00   sec  12.4 MBytes   104 Mbits/sec
[  5]   7.00-8.00   sec  12.4 MBytes   104 Mbits/sec
[  5]   8.00-9.00   sec  12.4 MBytes   104 Mbits/sec
[  5]   9.00-10.00  sec  12.3 MBytes   103 Mbits/sec
[  5]  10.00-10.20  sec  2.47 MBytes   104 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.20  sec   105 MBytes  86.1 Mbits/sec                  receiver
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------

服务端CPU占用率约为15%

3.3.3 长肥网络中：使用-w加大窗口后的TCP的测试结果

根据TCP流量控制算法和拥塞控制算法，为了让TCP占满整个带宽（其实是带宽时延），至少需要满足3个条件
1)接收端需要通告一个 **带宽时延**这么大的窗口，这样可以让发送端可以发送足够多的数据
2)发送端需要有 带宽*时延这么大的发送窗口，这样可以让发送端有足够多的数据可发
3)网络不能拥塞，不能用其它流量来占用网络，否则拥塞控制算法会让吞量下降

再根据
长肥网络与TCP的长肥管道
 使用iperf3对长肥网络进行TCP测试(TCP长肥管道)，如何配置iperf3
我们知道，通过-w增加窗口大小，会有利于在TCP长肥管道中得到更大的吞吐量。

使用以下命令，将客户端与服务端的接收发送缓冲区最大限制值都修改成64M

echo 33554432 > /proc/sys/net/core/wmem_max
echo 33554432 > /proc/sys/net/core/rmem_max

以下我们分别测试

-w参数	TCP吞吐量速率
1k	21Kbps
2k	29Kbps
4k	116Kbps
8k	232Kbps
16k	570Kbps
32k	1.2Mbps
64k	2.5Mbps
128k	5.3Mbps
256k	10.7Mbps
512k	20Mbps
1M	42Mbps
2M	84Mbps
4M	168Mbps
8M	336Mbps
16M	603Mbps
24M	776Mbps
26M	840Mbps
28M	900Mbps
29M	923Mbps
30M	944Mbps
31M	944Mbps
32M	944Mbps

至少目前为止，都向着-w越大，吞量越大的方向在走，这也是符合目前作者的理解的。我们看到当窗口到达30M后就已经达到了940Mbps的极限值，再增加窗口的大小并没有带来帮助。

测试log如下所示：


xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 1k
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 40378 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  2.73 KBytes  22.4 Kbits/sec    0   5.47 KBytes       
[  5]   1.00-2.00   sec  3.28 KBytes  26.9 Kbits/sec    0   5.47 KBytes       
[  5]   2.00-3.00   sec  2.19 KBytes  17.9 Kbits/sec    0   5.47 KBytes       
[  5]   3.00-4.00   sec  3.28 KBytes  26.9 Kbits/sec    0   5.47 KBytes       
[  5]   4.00-5.00   sec  2.19 KBytes  17.9 Kbits/sec    0   5.47 KBytes       
[  5]   5.00-6.00   sec  3.28 KBytes  26.9 Kbits/sec    0   5.47 KBytes       
^C[  5]   6.00-6.49   sec  1.09 KBytes  18.3 Kbits/sec    0   5.47 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-6.49   sec  18.0 KBytes  22.8 Kbits/sec    0             sender
[  5]   0.00-6.49   sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 2k
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 43396 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  3.54 KBytes  28.9 Kbits/sec    0   7.07 KBytes       
[  5]   1.00-2.00   sec  4.24 KBytes  34.8 Kbits/sec    0   7.07 KBytes       
[  5]   2.00-3.00   sec  2.83 KBytes  23.2 Kbits/sec    0   7.07 KBytes       
[  5]   3.00-4.00   sec  4.24 KBytes  34.8 Kbits/sec    0   7.07 KBytes       
[  5]   4.00-5.00   sec  2.83 KBytes  23.2 Kbits/sec    0   7.07 KBytes       
[  5]   5.00-6.00   sec  4.24 KBytes  34.8 Kbits/sec    0   7.07 KBytes       
^C[  5]   6.00-6.41   sec  1.41 KBytes  28.4 Kbits/sec    0   7.07 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-6.41   sec  23.3 KBytes  29.8 Kbits/sec    0             sender
[  5]   0.00-6.41   sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 4k
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 41002 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  12.7 KBytes   104 Kbits/sec    0   14.1 KBytes       
[  5]   1.00-2.00   sec  14.1 KBytes   116 Kbits/sec    0   14.1 KBytes       
[  5]   2.00-3.00   sec  14.1 KBytes   116 Kbits/sec    0   14.1 KBytes       
[  5]   3.00-4.00   sec  14.1 KBytes   116 Kbits/sec    0   14.1 KBytes       
[  5]   4.00-5.00   sec  14.1 KBytes   116 Kbits/sec    0   14.1 KBytes       
^C[  5]   5.00-5.38   sec  5.66 KBytes   121 Kbits/sec    0   14.1 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-5.38   sec  74.9 KBytes   114 Kbits/sec    0             sender
[  5]   0.00-5.38   sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 8k
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 57816 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  28.3 KBytes   232 Kbits/sec    0   14.1 KBytes       
[  5]   1.00-2.00   sec  28.3 KBytes   232 Kbits/sec    0   14.1 KBytes       
[  5]   2.00-3.00   sec  28.3 KBytes   232 Kbits/sec    0   14.1 KBytes       
[  5]   3.00-4.00   sec  28.3 KBytes   232 Kbits/sec    0   14.1 KBytes       
[  5]   4.00-5.00   sec  28.3 KBytes   232 Kbits/sec    0   14.1 KBytes       
[  5]   5.00-6.00   sec  28.3 KBytes   232 Kbits/sec    0   14.1 KBytes       
[  5]   6.00-7.00   sec  28.3 KBytes   232 Kbits/sec    0   14.1 KBytes       
^C[  5]   7.00-7.43   sec  17.0 KBytes   326 Kbits/sec    0   14.1 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-7.43   sec   215 KBytes   237 Kbits/sec    0             sender
[  5]   0.00-7.43   sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 16k
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 55020 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  56.6 KBytes   463 Kbits/sec    0   28.3 KBytes       
[  5]   1.00-2.00   sec  84.8 KBytes   695 Kbits/sec    0   28.3 KBytes       
[  5]   2.00-3.00   sec  56.6 KBytes   463 Kbits/sec    0   28.3 KBytes       
[  5]   3.00-4.00   sec  84.8 KBytes   695 Kbits/sec    0   28.3 KBytes       
[  5]   4.00-5.00   sec  56.6 KBytes   463 Kbits/sec    0   28.3 KBytes       
[  5]   5.00-6.00   sec  69.3 KBytes   568 Kbits/sec    0   28.3 KBytes       
[  5]   6.00-7.00   sec  84.8 KBytes   695 Kbits/sec    0   28.3 KBytes       
[  5]   7.00-8.00   sec  56.6 KBytes   463 Kbits/sec    0   28.3 KBytes       
[  5]   8.00-9.00   sec  83.4 KBytes   684 Kbits/sec    0   28.3 KBytes       
[  5]   9.00-10.00  sec  69.3 KBytes   568 Kbits/sec    0   28.3 KBytes       
[  5]  10.00-11.00  sec  56.6 KBytes   463 Kbits/sec    0   28.3 KBytes       
^C[  5]  11.00-11.39  sec  28.3 KBytes   599 Kbits/sec    0   28.3 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-11.39  sec   788 KBytes   567 Kbits/sec    0             sender
[  5]   0.00-11.39  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 32k
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 43342 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  94.7 KBytes   776 Kbits/sec    0   62.2 KBytes       
[  5]   1.00-2.00   sec   167 KBytes  1.37 Mbits/sec    0   62.2 KBytes       
[  5]   2.00-3.00   sec   130 KBytes  1.07 Mbits/sec    0   62.2 KBytes       
[  5]   3.00-4.00   sec   147 KBytes  1.20 Mbits/sec    0   62.2 KBytes       
[  5]   4.00-5.00   sec   177 KBytes  1.45 Mbits/sec    0   62.2 KBytes       
[  5]   5.00-6.00   sec   150 KBytes  1.23 Mbits/sec    0   62.2 KBytes       
[  5]   6.00-7.00   sec   119 KBytes   973 Kbits/sec    0   62.2 KBytes       
[  5]   7.00-8.00   sec   171 KBytes  1.40 Mbits/sec    0   62.2 KBytes       
[  5]   8.00-9.00   sec   148 KBytes  1.22 Mbits/sec    0   62.2 KBytes       
[  5]   9.00-10.00  sec   143 KBytes  1.17 Mbits/sec    0   62.2 KBytes       
[  5]  10.00-11.00  sec   146 KBytes  1.19 Mbits/sec    0   62.2 KBytes       
[  5]  11.00-12.00  sec   130 KBytes  1.07 Mbits/sec    0   62.2 KBytes       
^C[  5]  12.00-12.47  sec  77.8 KBytes  1.36 Mbits/sec    0   62.2 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-12.47  sec  1.76 MBytes  1.18 Mbits/sec    0             sender
[  5]   0.00-12.47  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 64k
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 34360 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   212 KBytes  1.74 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec   303 KBytes  2.48 Mbits/sec    0    133 KBytes       
[  5]   2.00-3.00   sec   265 KBytes  2.17 Mbits/sec    0    133 KBytes       
[  5]   3.00-4.00   sec   374 KBytes  3.06 Mbits/sec    0    133 KBytes       
[  5]   4.00-5.00   sec   310 KBytes  2.54 Mbits/sec    0    133 KBytes       
[  5]   5.00-6.00   sec   265 KBytes  2.17 Mbits/sec    0    133 KBytes       
[  5]   6.00-7.00   sec   336 KBytes  2.75 Mbits/sec    0    133 KBytes       
[  5]   7.00-8.00   sec   320 KBytes  2.62 Mbits/sec    0    133 KBytes       
[  5]   8.00-9.00   sec   322 KBytes  2.64 Mbits/sec    0    133 KBytes       
[  5]   9.00-10.00  sec   250 KBytes  2.05 Mbits/sec    0    133 KBytes       
^C[  5]  10.00-10.40  sec   166 KBytes  3.37 Mbits/sec    0    133 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.40  sec  3.05 MBytes  2.46 Mbits/sec    0             sender
[  5]   0.00-10.40  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 128k
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 59208 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   263 KBytes  2.15 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec   699 KBytes  5.73 Mbits/sec    0    255 KBytes       
[  5]   2.00-3.00   sec   579 KBytes  4.74 Mbits/sec    0    255 KBytes       
[  5]   3.00-4.00   sec   571 KBytes  4.67 Mbits/sec    0    255 KBytes       
[  5]   4.00-5.00   sec   737 KBytes  6.04 Mbits/sec    0    255 KBytes       
[  5]   5.00-6.00   sec   607 KBytes  4.98 Mbits/sec    0    255 KBytes       
[  5]   6.00-7.00   sec   592 KBytes  4.85 Mbits/sec    0    255 KBytes       
[  5]   7.00-8.00   sec   581 KBytes  4.76 Mbits/sec    0    272 KBytes       
[  5]   8.00-9.00   sec   733 KBytes  6.01 Mbits/sec    0    272 KBytes       
[  5]   9.00-10.00  sec   559 KBytes  4.58 Mbits/sec    0    272 KBytes       
[  5]  10.00-11.00  sec   700 KBytes  5.74 Mbits/sec    0    272 KBytes       
^C[  5]  11.00-11.46  sec   296 KBytes  5.28 Mbits/sec    0    272 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-11.46  sec  6.76 MBytes  4.95 Mbits/sec    0             sender
[  5]   0.00-11.46  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 256k
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 57688 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   512 KBytes  4.19 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  1.13 MBytes  9.49 Mbits/sec    0    527 KBytes       
[  5]   2.00-3.00   sec  1.26 MBytes  10.6 Mbits/sec    0    527 KBytes       
[  5]   3.00-4.00   sec  1.13 MBytes  9.51 Mbits/sec    0    527 KBytes       
[  5]   4.00-5.00   sec  1.25 MBytes  10.5 Mbits/sec    0    527 KBytes       
[  5]   5.00-6.00   sec  1.18 MBytes  9.88 Mbits/sec    0    527 KBytes       
[  5]   6.00-7.00   sec  1.21 MBytes  10.1 Mbits/sec    0    527 KBytes       
[  5]   7.00-8.00   sec  1.30 MBytes  10.9 Mbits/sec    0    527 KBytes       
[  5]   8.00-9.00   sec  1.33 MBytes  11.1 Mbits/sec    0    527 KBytes       
[  5]   9.00-10.00  sec  1.20 MBytes  10.1 Mbits/sec    0    527 KBytes       
^C[  5]  10.00-10.76  sec  1.01 MBytes  11.1 Mbits/sec    0    527 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.76  sec  12.5 MBytes  9.73 Mbits/sec    0             sender
[  5]   0.00-10.76  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 512k
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 59860 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  1010 KBytes  8.26 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  1.56 MBytes  13.1 Mbits/sec    0   1024 KBytes       
[  5]   2.00-3.00   sec  2.73 MBytes  22.9 Mbits/sec    0   1024 KBytes       
[  5]   3.00-4.00   sec  2.49 MBytes  20.9 Mbits/sec    0   1024 KBytes       
[  5]   4.00-5.00   sec  2.36 MBytes  19.8 Mbits/sec    0   1024 KBytes       
[  5]   5.00-6.00   sec  2.55 MBytes  21.4 Mbits/sec    0   1024 KBytes       
[  5]   6.00-7.00   sec  2.36 MBytes  19.8 Mbits/sec    0   1024 KBytes       
[  5]   7.00-8.00   sec  2.67 MBytes  22.4 Mbits/sec    0   1024 KBytes       
[  5]   8.00-9.00   sec  2.30 MBytes  19.3 Mbits/sec    0   1024 KBytes       
^C[  5]   9.00-9.63   sec  1.99 MBytes  26.6 Mbits/sec    0   1024 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-9.63   sec  22.0 MBytes  19.2 Mbits/sec    0             sender
[  5]   0.00-9.63   sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 1m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 35564 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  1.93 MBytes  16.2 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  2.08 MBytes  17.5 Mbits/sec    0   2.01 MBytes       
[  5]   2.00-3.00   sec  5.22 MBytes  43.8 Mbits/sec    0   2.01 MBytes       
[  5]   3.00-4.00   sec  5.34 MBytes  44.8 Mbits/sec    0   2.01 MBytes       
[  5]   4.00-5.00   sec  4.60 MBytes  38.6 Mbits/sec    0   2.01 MBytes       
[  5]   5.00-6.00   sec  5.03 MBytes  42.2 Mbits/sec    0   2.01 MBytes       
[  5]   6.00-7.00   sec  5.16 MBytes  43.3 Mbits/sec    0   2.01 MBytes       
[  5]   7.00-8.00   sec  5.10 MBytes  42.7 Mbits/sec    0   2.01 MBytes       
[  5]   8.00-9.00   sec  4.54 MBytes  38.1 Mbits/sec    0   2.01 MBytes       
[  5]   9.00-10.00  sec  5.28 MBytes  44.3 Mbits/sec    0   2.01 MBytes       
^C[  5]  10.00-10.40  sec  2.17 MBytes  45.2 Mbits/sec    0   2.01 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.40  sec  46.5 MBytes  37.5 Mbits/sec    0             sender
[  5]   0.00-10.40  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 2m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 57468 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  3.75 MBytes  31.4 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  2.50 MBytes  21.0 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  10.0 MBytes  83.9 Mbits/sec    0   4.02 MBytes       
[  5]   3.00-4.00   sec  10.0 MBytes  83.9 Mbits/sec    0   4.02 MBytes       
[  5]   4.00-5.00   sec  10.0 MBytes  83.9 Mbits/sec    0   4.02 MBytes       
[  5]   5.00-6.00   sec  10.0 MBytes  83.9 Mbits/sec    0   4.02 MBytes       
^C[  5]   6.00-6.63   sec  7.12 MBytes  95.6 Mbits/sec    0   4.02 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-6.63   sec  53.4 MBytes  67.6 Mbits/sec    0             sender
[  5]   0.00-6.63   sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 4m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 39568 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  6.25 MBytes  52.4 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  2.50 MBytes  21.0 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  20.0 MBytes   168 Mbits/sec    0   5.85 MBytes       
[  5]   3.00-4.00   sec  20.0 MBytes   168 Mbits/sec    0   5.85 MBytes       
[  5]   4.00-5.00   sec  20.0 MBytes   168 Mbits/sec    0   5.85 MBytes       
[  5]   5.00-6.00   sec  20.0 MBytes   168 Mbits/sec    0   5.85 MBytes       
^C[  5]   6.00-6.10   sec  3.75 MBytes   323 Mbits/sec    0   5.85 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-6.10   sec  92.5 MBytes   127 Mbits/sec    0             sender
[  5]   0.00-6.10   sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 8m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 50820 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  11.2 MBytes  94.3 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  2.50 MBytes  21.0 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  25.0 MBytes   210 Mbits/sec    0   16.0 MBytes       
[  5]   3.00-4.00   sec  31.2 MBytes   262 Mbits/sec    0   16.0 MBytes       
[  5]   4.00-5.00   sec  33.8 MBytes   283 Mbits/sec    0   16.0 MBytes       
[  5]   5.00-6.00   sec  38.8 MBytes   325 Mbits/sec    0   16.0 MBytes       
[  5]   6.00-7.00   sec  38.8 MBytes   325 Mbits/sec    0   16.0 MBytes       
[  5]   7.00-8.00   sec  40.0 MBytes   336 Mbits/sec    0   16.0 MBytes       
[  5]   8.00-9.00   sec  40.0 MBytes   336 Mbits/sec    0   16.0 MBytes       
[  5]   9.00-10.00  sec  40.0 MBytes   336 Mbits/sec    0   16.0 MBytes       
^C[  5]  10.00-10.37  sec  16.2 MBytes   372 Mbits/sec    0   16.0 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.37  sec   318 MBytes   257 Mbits/sec    0             sender
[  5]   0.00-10.37  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 16m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 54698 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  21.2 MBytes   178 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  3.75 MBytes  31.5 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  47.5 MBytes   399 Mbits/sec    0   33.0 MBytes       
[  5]   3.00-4.00   sec  72.5 MBytes   608 Mbits/sec    0   33.0 MBytes       
[  5]   4.00-5.00   sec  71.2 MBytes   598 Mbits/sec    0   33.0 MBytes       
[  5]   5.00-6.00   sec  71.2 MBytes   598 Mbits/sec    0   33.0 MBytes       
[  5]   6.00-7.00   sec  72.5 MBytes   608 Mbits/sec    0   33.0 MBytes       
[  5]   7.00-8.00   sec  71.2 MBytes   598 Mbits/sec    0   33.0 MBytes       
[  5]   8.00-9.00   sec  71.2 MBytes   598 Mbits/sec    0   33.0 MBytes       
[  5]   9.00-10.00  sec  71.2 MBytes   598 Mbits/sec    0   33.0 MBytes       
^C[  5]  10.00-10.48  sec  35.0 MBytes   610 Mbits/sec    0   33.0 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.48  sec   609 MBytes   487 Mbits/sec    0             sender
[  5]   0.00-10.48  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 24m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 58668 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  31.2 MBytes   262 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  3.75 MBytes  31.5 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  55.0 MBytes   461 Mbits/sec    0   25.8 MBytes       
[  5]   3.00-4.00   sec  92.5 MBytes   776 Mbits/sec    0   25.8 MBytes       
[  5]   4.00-5.00   sec  93.8 MBytes   786 Mbits/sec    0   25.8 MBytes       
[  5]   5.00-6.00   sec  93.8 MBytes   787 Mbits/sec    0   25.8 MBytes       
[  5]   6.00-7.00   sec  90.0 MBytes   755 Mbits/sec    0   25.8 MBytes       
[  5]   7.00-8.00   sec  96.2 MBytes   807 Mbits/sec    0   25.8 MBytes       
[  5]   8.00-9.00   sec  95.0 MBytes   797 Mbits/sec    0   25.8 MBytes       
[  5]   9.00-10.00  sec  92.5 MBytes   776 Mbits/sec    0   25.8 MBytes       
^C[  5]  10.00-10.64  sec  65.0 MBytes   849 Mbits/sec    0   25.8 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.64  sec   809 MBytes   638 Mbits/sec    0             sender
[  5]   0.00-10.64  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 26m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 33020 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  33.8 MBytes   283 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  3.75 MBytes  31.5 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  57.5 MBytes   482 Mbits/sec    0   27.2 MBytes       
[  5]   3.00-4.00   sec  97.5 MBytes   818 Mbits/sec    0   27.3 MBytes       
[  5]   4.00-5.00   sec   101 MBytes   849 Mbits/sec    0   27.3 MBytes       
[  5]   5.00-6.00   sec   101 MBytes   849 Mbits/sec    0   27.3 MBytes       
[  5]   6.00-7.00   sec  97.5 MBytes   818 Mbits/sec    0   27.3 MBytes       
[  5]   7.00-8.00   sec   101 MBytes   849 Mbits/sec    0   27.3 MBytes       
[  5]   8.00-9.00   sec   101 MBytes   849 Mbits/sec    0   27.3 MBytes       
[  5]   9.00-10.00  sec   100 MBytes   839 Mbits/sec    0   27.3 MBytes       
[  5]  10.00-11.00  sec   102 MBytes   860 Mbits/sec    0   27.3 MBytes       
[  5]  11.00-12.00  sec   105 MBytes   881 Mbits/sec    0   27.3 MBytes       
[  5]  12.00-13.00  sec   100 MBytes   839 Mbits/sec    0   27.3 MBytes       
^C[  5]  13.00-13.72  sec  72.5 MBytes   842 Mbits/sec    0   27.3 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-13.72  sec  1.15 GBytes   718 Mbits/sec    0             sender
[  5]   0.00-13.72  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 28m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 39638 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  36.2 MBytes   304 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  3.75 MBytes  31.5 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  57.5 MBytes   482 Mbits/sec    0   27.2 MBytes       
[  5]   3.00-4.00   sec   104 MBytes   870 Mbits/sec    0   29.5 MBytes       
[  5]   4.00-5.00   sec   106 MBytes   891 Mbits/sec    0   29.5 MBytes       
[  5]   5.00-6.00   sec   108 MBytes   902 Mbits/sec    0   29.5 MBytes       
[  5]   6.00-7.00   sec   105 MBytes   881 Mbits/sec    0   29.5 MBytes       
[  5]   7.00-8.00   sec   106 MBytes   891 Mbits/sec    0   29.5 MBytes       
[  5]   8.00-9.00   sec   106 MBytes   891 Mbits/sec    0   29.5 MBytes       
[  5]   9.00-10.00  sec   105 MBytes   881 Mbits/sec    0   29.5 MBytes       
[  5]  10.00-11.00  sec   110 MBytes   923 Mbits/sec    0   29.5 MBytes       
[  5]  11.00-12.00  sec   109 MBytes   912 Mbits/sec    0   29.5 MBytes       
[  5]  12.00-13.00  sec   108 MBytes   902 Mbits/sec    0   29.5 MBytes       
[  5]  13.00-14.00  sec   108 MBytes   902 Mbits/sec    0   29.5 MBytes       
[  5]  14.00-15.00  sec   109 MBytes   912 Mbits/sec    0   29.5 MBytes       
^C[  5]  15.00-15.46  sec  51.2 MBytes   939 Mbits/sec    0   29.5 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-15.46  sec  1.40 GBytes   777 Mbits/sec    0             sender
[  5]   0.00-15.46  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 29m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 49936 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  37.5 MBytes   314 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  3.75 MBytes  31.5 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  57.5 MBytes   482 Mbits/sec    0   27.2 MBytes       
[  5]   3.00-4.00   sec   105 MBytes   881 Mbits/sec    0   30.6 MBytes       
[  5]   4.00-5.00   sec   110 MBytes   923 Mbits/sec    0   30.6 MBytes       
[  5]   5.00-6.00   sec   110 MBytes   923 Mbits/sec    0   30.6 MBytes       
[  5]   6.00-7.00   sec   110 MBytes   923 Mbits/sec    0   30.6 MBytes       
[  5]   7.00-8.00   sec   110 MBytes   923 Mbits/sec    0   30.6 MBytes       
[  5]   8.00-9.00   sec   111 MBytes   933 Mbits/sec    0   30.6 MBytes       
^C[  5]   9.00-9.63   sec  73.8 MBytes   977 Mbits/sec    0   30.6 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-9.63   sec   829 MBytes   722 Mbits/sec    0             sender
[  5]   0.00-9.63   sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 30m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 56056 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  38.8 MBytes   325 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  3.75 MBytes  31.5 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  36.2 MBytes   304 Mbits/sec    0   12.2 MBytes       
[  5]   3.00-4.00   sec  53.8 MBytes   451 Mbits/sec    0   14.9 MBytes       
[  5]   4.00-5.00   sec  71.2 MBytes   598 Mbits/sec    0   18.5 MBytes       
[  5]   5.00-6.00   sec  78.8 MBytes   661 Mbits/sec    0   22.4 MBytes       
[  5]   6.00-7.00   sec  88.8 MBytes   744 Mbits/sec    0   26.8 MBytes       
[  5]   7.00-8.00   sec   108 MBytes   902 Mbits/sec    0   31.5 MBytes       
[  5]   8.00-9.00   sec   112 MBytes   944 Mbits/sec    0   31.5 MBytes       
[  5]   9.00-10.00  sec   112 MBytes   944 Mbits/sec    0   31.5 MBytes       
[  5]  10.00-11.00  sec   112 MBytes   944 Mbits/sec    0   31.5 MBytes       
[  5]  11.00-12.00  sec   112 MBytes   944 Mbits/sec    0   31.5 MBytes       
^C[  5]  12.00-12.73  sec  86.2 MBytes   990 Mbits/sec    0   31.5 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-12.73  sec  1015 MBytes   669 Mbits/sec    0             sender
[  5]   0.00-12.73  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 31m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 50572 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  40.0 MBytes   335 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  3.75 MBytes  31.5 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  40.0 MBytes   336 Mbits/sec    0   12.7 MBytes       
[  5]   3.00-4.00   sec  62.5 MBytes   524 Mbits/sec    0   15.8 MBytes       
[  5]   4.00-5.00   sec  77.5 MBytes   650 Mbits/sec    0   19.7 MBytes       
[  5]   5.00-6.00   sec  91.2 MBytes   765 Mbits/sec    0   24.2 MBytes       
[  5]   6.00-7.00   sec   108 MBytes   902 Mbits/sec    0   29.6 MBytes       
[  5]   7.00-8.00   sec   112 MBytes   943 Mbits/sec    0   32.3 MBytes       
[  5]   8.00-9.00   sec   111 MBytes   934 Mbits/sec    0   32.3 MBytes       
[  5]   9.00-10.00  sec   112 MBytes   944 Mbits/sec    0   32.3 MBytes       
[  5]  10.00-11.00  sec   112 MBytes   944 Mbits/sec    0   32.3 MBytes       
[  5]  11.00-12.00  sec   112 MBytes   944 Mbits/sec    0   32.3 MBytes       
[  5]  12.00-13.00  sec   111 MBytes   933 Mbits/sec    0   32.3 MBytes       
^C[  5]  13.00-13.02  sec  1.25 MBytes   446 Mbits/sec    0   32.3 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-13.02  sec  1.07 GBytes   706 Mbits/sec    0             sender
[  5]   0.00-13.02  sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 32m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 33700 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  41.2 MBytes   346 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  3.75 MBytes  31.5 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  45.0 MBytes   378 Mbits/sec    0   47.7 MBytes       
[  5]   3.00-4.00   sec   114 MBytes   954 Mbits/sec    0   66.1 MBytes       
[  5]   4.00-5.00   sec   111 MBytes   933 Mbits/sec    0   66.1 MBytes       
[  5]   5.00-6.00   sec   112 MBytes   944 Mbits/sec    0   66.1 MBytes       
[  5]   6.00-7.00   sec   112 MBytes   944 Mbits/sec    0   66.1 MBytes       
[  5]   7.00-8.00   sec   112 MBytes   944 Mbits/sec    0   66.1 MBytes       
[  5]   8.00-9.00   sec   112 MBytes   944 Mbits/sec    0   66.1 MBytes       
^C[  5]   9.00-9.38   sec  45.0 MBytes   984 Mbits/sec    0   66.1 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-9.38   sec   810 MBytes   724 Mbits/sec    0             sender
[  5]   0.00-9.38   sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 64m
Connecting to host 192.168.3.60, port 5201
[  5] local 192.168.3.107 port 56982 connected to 192.168.3.60 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  41.2 MBytes   346 Mbits/sec    0    113 KBytes       
[  5]   1.00-2.00   sec  3.75 MBytes  31.5 Mbits/sec    0   3.54 MBytes       
[  5]   2.00-3.00   sec  58.8 MBytes   493 Mbits/sec    0   27.2 MBytes       
[  5]   3.00-4.00   sec   111 MBytes   933 Mbits/sec    0   32.7 MBytes       
[  5]   4.00-5.00   sec   112 MBytes   944 Mbits/sec    0   33.6 MBytes       
[  5]   5.00-6.00   sec   111 MBytes   933 Mbits/sec    0   33.6 MBytes       
^C[  5]   6.00-6.39   sec  45.0 MBytes   976 Mbits/sec    0   33.6 MBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-6.39   sec   484 MBytes   635 Mbits/sec    0             sender
[  5]   0.00-6.39   sec  0.00 Bytes  0.00 bits/sec                  receiver
iperf3: interrupt - the client has terminated
xxx@xxx-pc:~$ /usr/bin/iperf3 -c 192.168.3.60 -t 100 -w 65m
Connecting to host 192.168.3.60, port 5201
iperf3: error - socket buffer size not set correctly

注意：使用了一个巨大的窗口值来提高吞吐量其实是带来RTT测试周期变长的风险的，RTT测量周期变长意味着TCP协议栈不能很好的去适应网络的状态的变化。

iPerf3 -w 参数详细图文分析

本文目录

1、官方解释

2、-w参数使用

3、具体参数使用说明

3.1、对于UDP，-w的使用详解：

3.1.1、如何查看Linux系统定义的UDP的发送、接收缓冲区的最小值

3.1.2、如何查看Linux系统定义的UDP的发送、接收缓冲区的最大值

3.2、对于TCP，-w的使用详解：

3.2.1、测试环境：

3.2.2、模拟TCP长肥管道的测试过程

3.3.3 长肥网络中TCP的测试结果

3.3.3 长肥网络中：使用-w加大窗口后的TCP的测试结果

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iPerf3 -w 参数详细图文分析

本文目录

1、 官方解释

2、-w参数使用

3、具体参数使用说明

3.1、对于UDP，-w的使用详解：

3.1.1、 如何查看Linux系统定义的UDP的发送、接收缓冲区的最小值

3.1.2、 如何查看Linux系统定义的UDP的发送、接收缓冲区的最大值

3.2、对于TCP，-w的使用详解：

3.2.1、测试环境：

3.2.2、模拟TCP长肥管道的测试过程

3.3.3 长肥网络中TCP的测试结果

3.3.3 长肥网络中：使用-w加大窗口后的TCP的测试结果

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1、官方解释

3.1.1、如何查看Linux系统定义的UDP的发送、接收缓冲区的最小值

3.1.2、如何查看Linux系统定义的UDP的发送、接收缓冲区的最大值