NotePublic/Software/Applications/IPerf/IPerf_使用说明.md

# IPerf 使用说明

IPerf 可用于网络带宽测试，可在 Windows、Linux、Android、MacOS 和 iOS 系统下运行。主要有 IPerf2 和 IPerf3 两大版本。

IPerf 可做为 Server 端或 Client 端运行，Client 发起与 Server 端的通讯，并对通讯性能进行分析。

## 单线程 TCP 测试

```bash
# Server
iperf3 -s -p <port>
# Client
iperf3 -c <server ip> -p <server port> -i <interval> -t <time>
```

## 多线程 TCP 测试

```bash
# Server
iperf3 -s -p <port>
# Client
iperf3 -c <server ip> -p <server port> -i <interval> -t <time> -P <parallel>
```

## 单线程 UDP 测试

```bash
# Server
iperf3 -s -p <port>
# Client
iperf3 -u -c <host> -p <port> -i <interval> -t <time>
```

## 多线程 UDP 测试

```bash
# Server
iperf3 -s -p <port>
# Client
iperf3 -u -c <host> -p <port> -i <interval> -t <time> -P <parallel>
```

## 以太网缓存

有时候 UDP 丢包率高，可能是因为缓存设置参数不够优化，Linux 下修改

```bash
echo 21299200 > /proc/sys/net/core/rmem_default
echo 21299200 > /proc/sys/net/core/rmem_max
```

两个文件来修改以太网缓存参数。

## 基本参数说明

| Options                    | Description                                                        |
|----------------------------|--------------------------------------------------------------------|
| -i #                       | Server or Client: seconds between periodic bandwidth reports       |
| -p #                       | Server or Client: server port to listen on/connect to              |
| -s                         | Server specific: run in server mode                                |
| -c \<host\>                | Client specific: run in client mode, connecting to \<host\>        |
| -P #                       | Client specific: number of parallel client streams to run          |
| -t #                       | Client specific: time in seconds to transmit for (default 10 secs) |
| -u                         | Client specific: use UDP rather than TCP                           |
| -b, --bandwidth #[KMG][/#] | target bandwidth in bits/sec (0 for unlimited, default 1 Mbit/sec for UDP, unlimited for TCP, optional slash and packet count for burst mode) |