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【NSDI 2022】PowerTCP：突破数据中心网络的性能极限

NSDI
2022-11-18
1806
更新：2023-01-04 21:42:41

### Motivation

两种CC: **current-based（react to variations）** 和 **voltage-based （react to absolute values）**

上图非常形象地说明了两种CC各自本质上的不足.

论文在Motivation部分将已有CC统一成了一个抽象模型，借助一些控制理论，得到两个具体的takeaway:

> *While voltage-based CC can in principle meet the desired equilibrium state requirements, current-based CC cannot.*

> *Current-based CC is superior in terms of fast reaction but lacks equilibrium state properties while voltage-based CC eventually reaches a unique equilibrium but overreacts in its response for almost any initial state resulting in long trajectories from initial state to equilibrium state.*

### PowerTCP

借助INT获得Power: power = currrent * voltage

Standalone Version: 不依赖于INT获得队长信息，使用RTT间接估计

### Evaluation

**目前没有真实系统实现**

[代码](https://powertcp.self-adjusting.net/)

最后论文还评估了PowerTCP在Reconfigurable DCN场景下的性能。PowerTCP的rapid reaction to congestion and available bandwidth适用于这种带宽快速变化的场景。

### Thinking

亮点: Motivation部分的分析和“Power”概念。

### 参考文献

[Pushing the Performance Limits of Datacenter Networks](https://www.usenix.org/system/files/nsdi22-paper-addanki_3.pdf)

> 作者：yiran
>
> 链接：https://yi-ran.github.io/2022/05/03/PowerTCP-NSDI-2022/