原创 NXP iMX8M Plus 双网口性能测试

By Toradex 胡珊逢

Verdin iMX8M Plus 是 Toradex 采用 NXP 最新的 i.MX 8M Plus 处理器的计算机模块，其具有 4x Cortex-A53 和 Cortex-M7 核心，支持神经网络加速运算的 NPU，H.265 硬件编码，CAN FD ，以及双路千兆以太网。配合 Verdin 开发板，用户可以直接测试两路以太网。文章将对网络性能做简要的测试。

使用 Toradex Easy Installer 安装 Linux BSP v5.3.0， 默认的配置已经支持两路千兆以太网。因此安装完成重启后即可看到两个网络接口。

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root@verdin-imx8mp:~# ifconfig

eth0      Link encap:Ethernet  HWaddr 00:14:2D:78:82:04  

          inet addr:192.168.20.120  Bcast:192.168.20.255  Mask:255.255.255.0

          inet6 addr: fe80::214:2dff:fe78:8204/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:5105505 errors:0 dropped:0 overruns:0 frame:0

          TX packets:5988237 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:7344324802 (6.8 GiB)  TX bytes:8611102924 (8.0 GiB)

          Interrupt:48

eth1      Link encap:Ethernet  HWaddr 00:14:2D:68:82:04  

          inet addr:192.168.200.150  Bcast:192.168.200.255  Mask:255.255.255.0

          inet6 addr: fe80::214:2dff:fe68:8204/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:6686311 errors:0 dropped:0 overruns:0 frame:0

          TX packets:247321 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:6234153398 (5.8 GiB)  TX bytes:8180651220 (7.6 GiB)

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Verdin 开发板分别和两台电脑相连，链路速度为 1000Mbps。

IP 地址设置如下。

PC1:192.168.200.1

PC2:192.168.20.132

Eth0: 192.168.200.150

Eth1:192.168.20.120

测试场景为

l Eth0和 Eth1 单独向 PC1 和 PC2 发送数据

l Eth0和 Eth1同时向 PC1 和 PC2 发送数据

l Eth0和 Eth1 单独接收来自 PC1 和 PC2 的数据

l Eth0和 Eth1 同时接收来自 PC1 和 PC2 的数据

l Eth0 上的数据转发到 Eth1

期间测试模块 Eth0和 Eth1 的最大带宽以及 CPU 占用率。

Eth0和 Eth1 单独向 PC1 和 PC2 发送数据

在 PC1 和 PC2 上运行 iperf3 服务器。

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$ iperf3 -s

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在 Verdin iMX8M Plus 运行 iperf3 向 PC 发送数据。Eth0 和 Eth1 的测试数据如下。

Eth0:

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root@verdin-imx8mp:~# iperf3 -c 192.168.20.132

Connecting to host 192.168.20.132, port 5201

[  5] local 192.168.20.120 port 34982 connected to 192.168.20.132 port 5201

[ ID] Interval           Transfer     Bitrate         Retr  Cwnd

[  5]   0.00-1.00   sec   114 MBytes   957 Mbits/sec    0    373 KBytes       

[  5]   1.00-2.00   sec   112 MBytes   942 Mbits/sec    0    373 KBytes       

[  5]   2.00-3.00   sec   112 MBytes   937 Mbits/sec    0    410 KBytes       

[  5]   3.00-4.00   sec   112 MBytes   942 Mbits/sec    0    410 KBytes       

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

[ ID] Interval           Transfer     Bitrate         Retr

[  5]   0.00-10.00  sec  1.10 GBytes   942 Mbits/sec    0             sender

[  5]   0.00-10.00  sec  1.10 GBytes   941 Mbits/sec                  receiver

iperf Done.

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Eth1:

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root@verdin-imx8mp:~# iperf3 -c 192.168.200.1

Connecting to host 192.168.200.1, port 5201

[  5] local 192.168.200.150 port 59206 connected to 192.168.200.1 port 5201

[ ID] Interval           Transfer     Bitrate         Retr  Cwnd

[  5]   0.00-1.00   sec   111 MBytes   934 Mbits/sec    0   1.14 MBytes       

[  5]   1.00-2.00   sec   112 MBytes   944 Mbits/sec    0   1.23 MBytes       

[  5]   2.00-3.00   sec   111 MBytes   933 Mbits/sec    0   1.23 MBytes       

[  5]   3.00-4.00   sec   112 MBytes   943 Mbits/sec    0   1.23 MBytes       

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

[ ID] Interval           Transfer     Bitrate         Retr

[  5]   0.00-10.00  sec  1.09 GBytes   940 Mbits/sec    0             sender

[  5]   0.00-10.00  sec  1.09 GBytes   937 Mbits/sec                  receiver

iperf Done.

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Verdin iMX8M Plus CPU 占用率：

Eth0和 Eth1同时向 PC1 和 PC2 发送数据

Eth0：

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root@verdin-imx8mp:~# iperf3 -c 192.168.20.132

Connecting to host 192.168.20.132, port 5201

[  5] local 192.168.20.120 port 34994 connected to 192.168.20.132 port 5201

[ ID] Interval           Transfer     Bitrate         Retr  Cwnd

[  5]   0.00-1.00   sec   113 MBytes   949 Mbits/sec    0    438 KBytes       

[  5]   1.00-2.00   sec   112 MBytes   937 Mbits/sec    0    464 KBytes       

[  5]   2.00-3.00   sec   112 MBytes   943 Mbits/sec    0    464 KBytes       

[  5]   3.00-4.00   sec   111 MBytes   935 Mbits/sec    0    464 KBytes       

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

[ ID] Interval           Transfer     Bitrate         Retr

[  5]   0.00-10.00  sec  1.09 GBytes   940 Mbits/sec    0             sender

[  5]   0.00-10.00  sec  1.09 GBytes   939 Mbits/sec                  receiver

iperf Done.

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Eth1：

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root@verdin-imx8mp:~# iperf3 -c 192.168.200.1

Connecting to host 192.168.200.1, port 5201

[  5] local 192.168.200.150 port 59210 connected to 192.168.200.1 port 5201

[ ID] Interval           Transfer     Bitrate         Retr  Cwnd

[  5]   0.00-1.00   sec   111 MBytes   929 Mbits/sec    0   1.14 MBytes       

[  5]   1.00-2.00   sec   112 MBytes   944 Mbits/sec    0   1.14 MBytes       

[  5]   2.00-3.00   sec   111 MBytes   933 Mbits/sec    0   1.14 MBytes       

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

[ ID] Interval           Transfer     Bitrate         Retr

[  5]   0.00-10.00  sec  1.09 GBytes   936 Mbits/sec    0             sender

[  5]   0.00-10.00  sec  1.09 GBytes   933 Mbits/sec                  receiver

iperf Done.

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Verdin iMX8M Plus CPU 占用率：

Eth0和 Eth1 单独接收来自 PC1 和 PC2 的数据

在 Verdin iMX8M Plus 分别运行 iperf3 服务器，针对 Eth0 和 Eth1 使用不同的端口。

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root@verdin-imx8mp:~# iperf3 -B 192.168.20.120 -s

root@verdin-imx8mp:~# iperf3 -B 192.168.200.150 -p 5202 -s

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Eth0：

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root@verdin-imx8mp:~# iperf3 -B 192.168.20.120 -s

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Server listening on 5201

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Accepted connection from 192.168.20.132, port 48674

[  5] local 192.168.20.120 port 5201 connected to 192.168.20.132 port 48676

[ ID] Interval           Transfer     Bitrate

[  5]   0.00-1.00   sec   111 MBytes   933 Mbits/sec                  

[  5]   1.00-2.00   sec   111 MBytes   935 Mbits/sec                  

[  5]   2.00-3.00   sec   111 MBytes   934 Mbits/sec                  

[  5]   3.00-4.00   sec   111 MBytes   935 Mbits/sec                  

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

[ ID] Interval           Transfer     Bitrate

[  5]   0.00-10.00  sec  1.09 GBytes   934 Mbits/sec                  receiver

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

Server listening on 5201

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

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Eth1：

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root@verdin-imx8mp:~# iperf3 -B 192.168.200.150 -p 5202 -s

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Server listening on 5202

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Accepted connection from 192.168.200.1, port 47290

[  5] local 192.168.200.150 port 5202 connected to 192.168.200.1 port 47292

[ ID] Interval           Transfer     Bitrate

[  5]   0.00-1.00   sec   110 MBytes   919 Mbits/sec                  

[  5]   1.00-2.00   sec   112 MBytes   939 Mbits/sec                  

[  5]   2.00-3.00   sec   112 MBytes   941 Mbits/sec                  

[  5]   3.00-4.00   sec   112 MBytes   941 Mbits/sec                  

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

[ ID] Interval           Transfer     Bitrate

[  5]   0.00-10.00  sec  1.09 GBytes   938 Mbits/sec                  receiver

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Verdin iMX8M Plus CPU 占用率：

Eth0和 Eth1 同时接收来自 PC1 和 PC2 的数据

Eth0：

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root@verdin-imx8mp:~# iperf3 -B 192.168.20.120 -s

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Server listening on 5201

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Accepted connection from 192.168.20.132, port 48712

[  5] local 192.168.20.120 port 5201 connected to 192.168.20.132 port 48714

[ ID] Interval           Transfer     Bitrate

[  5]   0.00-1.00   sec   111 MBytes   931 Mbits/sec                  

[  5]   1.00-2.00   sec   111 MBytes   934 Mbits/sec                  

[  5]   2.00-3.00   sec   111 MBytes   934 Mbits/sec                  

[  5]   3.00-4.00   sec   111 MBytes   935 Mbits/sec                  

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

[ ID] Interval           Transfer     Bitrate

[  5]   0.00-10.00  sec  1.09 GBytes   934 Mbits/sec                  receiver

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

Server listening on 5201

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

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Eth1：

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root@verdin-imx8mp:~# iperf3 -B 192.168.200.150 -p 5202 -s

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Server listening on 5202

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Accepted connection from 192.168.200.1, port 47308

[  5] local 192.168.200.150 port 5202 connected to 192.168.200.1 port 47310

[ 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                  

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

[ ID] Interval           Transfer     Bitrate

[  5]   0.00-10.00  sec  1.08 GBytes   928 Mbits/sec                  receiver

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

Server listening on 5202

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

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Verdin iMX8M Plus CPU 占用率：

Eth0 上的数据转发到 Eth1

为了将 Eth0 的数据转发到 Eth1，需要设置 /etc/sysctl.conf 。

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# needed for routing, including masquerading or NAT

net/ipv4/ip_forward=1  

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然后运行 sysctl 另设置生效，当然重启系统也可以。

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root@verdin-imx8mp:~# sysctl -p

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设置转发规则。

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root@verdin-imx8mp:~# iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

root@verdin-imx8mp:~# iptables -A FORWARD -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT

root@verdin-imx8mp:~# iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT

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在 PC2 上启动 iperf3 服务器，PC 1 运行 iper3 客户端发送数据，所有的数据由 Verdin iMX8M Plus 负责从 Eth0 转发到 Eth1 上。

PC2 Server:

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$ iperf3 -s

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Server listening on 5201

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Accepted connection from 192.168.20.120, port 55360

[  5] local 192.168.20.132 port 5201 connected to 192.168.20.120 port 55362

[ ID] Interval           Transfer     Bitrate

[  5]   0.00-1.00   sec   105 MBytes   881 Mbits/sec                  

[  5]   1.00-2.00   sec   111 MBytes   928 Mbits/sec                  

[  5]   2.00-3.00   sec   110 MBytes   921 Mbits/sec                  

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

[ ID] Interval           Transfer     Bitrate

[  5]   0.00-10.00  sec  1.08 GBytes   931 Mbits/sec                  receiver

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PC1 Client:

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$ iperf3 -c 192.168.20.132

Connecting to host 192.168.20.132, port 5201

[  5] local 192.168.200.1 port 55362 connected to 192.168.20.132 port 5201

[ ID] Interval           Transfer     Bitrate         Retr  Cwnd

[  5]   0.00-1.00   sec   108 MBytes   904 Mbits/sec    0    471 KBytes       

[  5]   1.00-2.00   sec   110 MBytes   926 Mbits/sec    0    492 KBytes       

[  5]   2.00-3.00   sec   109 MBytes   916 Mbits/sec    0    492 KBytes       

[  5]   3.00-4.00   sec   112 MBytes   938 Mbits/sec    0    492 KBytes       

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

[ ID] Interval           Transfer     Bitrate         Retr

[  5]   0.00-10.00  sec  1.09 GBytes   934 Mbits/sec    0             sender

[  5]   0.00-10.00  sec  1.08 GBytes   931 Mbits/sec                  receiver

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Verdin iMX8M Plus CPU 占用率：

数据汇总如下。

两个千兆网口无论是在单独还是同时收发数据时都达到920Mbps 以上，包括网口之间的数据转发，基本接近满带宽。在 CPU 占用方面，当两个千兆网口以接近满带宽速率同时工作时，其中一个核心站占用率会超过 70%。

总结

Verdin iMX8M Plus 的双网口设计为多网口需求的应用提供了理想的选择，例如在工业自动化中，一个网口运行实时性要求高的应用如 EtherCAT，而另外一个则可以用于一般的网络通信。或者另一个网口可以用作冗余接口，或者连接两个不同的网络。Verdin iMX8M Plus 还有许多其他实用的功能，我们会在后续的文章进行介绍