数据指标
收集相关的测试数据，用于性能分析，问题定位等
| 指标 | 说明 | 备注 |
|---|---|---|
| Sending rate / Receiver rate / Good throughput | 发送速率 / 接收速率 / 有效吞吐 | 推荐间隔，200ms |
| Packets sent / Packets received | 发送包的总数量 / 接收包的总数量 | |
| Bytes sent / Bytes received | 发送的总字节数 / 接收到的总字节数 | |
| Packet delay | 每个包的延迟 | |
| Packets lost / Packets discarded | 传输丢包数量 / jittle buffer 或播放器丢包数量 | |
| Post-repair loss | 通过重传或FEC恢复出来的包 | |
| Convergence time | 收敛时间，从启动或网络突变到稳定状态所需的时间 | |
| Instability or oscillation in the sending rate | 发送码率波动，两个边界值之间切换的次数 | 两边界的比值一般设为4 |
| Bandwidth Utilization | 带宽利用率 |
网络参数配置推荐
| 参数 | 说明 | 备注 |
|---|---|---|
| One-way Propagation Delay | Very low latency | 0-1ms |
| Low latency | 50ms | |
| High latency | 150ms | |
| Extreme latency | 300ms | |
| End-to-end Loss | no loss | 0% |
| very low | 1% | |
| low | 5% | |
| high | 10% | |
| very high | 20% | |
| DropTail Router Queue Length | QoS-aware (or short) | 70ms |
| Nominal | 300-500ms | |
| Buffer-bloated | 1000-2000ms | |
| Loss generation model | Uniform | |
| Gaussian | ||
| Burst | ||
| Traffic Models | TCP traffic | Long-lived TCP flows / Short TCP flows |
| UDP traffic | Constant bit rate (CBR) flow | |
| Video model | Behavior of a video encoder | Video traces |
| Jitter model | Packet Delay Variation (PDV) | Receiver side |
