Nanosecond level time synchronization in datacenter network based on Telemetry architecture

Qianli ZHANG; Chaofan ZHANG; Jilong WANG; Xiangyu TANG; Zhengchen SHEN; Hui WANG

doi:10.11959/j.issn.1000-436x.2021147

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Nanosecond level time synchronization in datacenter network based on Telemetry architecture

Papers | 更新时间：2024-06-05

- Nanosecond level time synchronization in datacenter network based on Telemetry architecture
- Journal on Communications Vol. 42, Issue 10, Pages: 117-129(2021)
- 作者机构：
  
  清华大学网络科学与网络空间研究院，北京 100084
- 作者简介：
- 基金信息：
  
  The National Key Research and Development Program of China(2017YFB0503703)
- DOI：10.11959/j.issn.1000-436x.2021147
  CLC： TP393
- Online First：2021-10，
  
  Published：25 October 2021
- 稿件说明：
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Qianli ZHANG, Chaofan ZHANG, Jilong WANG, et al. Nanosecond level time synchronization in datacenter network based on Telemetry architecture[J]. Journal on Communications, 2021, 42(10): 117-129.
DOI：

Qianli ZHANG, Chaofan ZHANG, Jilong WANG, et al. Nanosecond level time synchronization in datacenter network based on Telemetry architecture[J]. Journal on Communications, 2021, 42(10): 117-129. DOI： 10.11959/j.issn.1000-436x.2021147.

摘要

为了解决传统的局部时间同步架构与集中式管理脱节、需要额外交互开销、时间数据较少易受离群值影响等问题，针对数据中心网络的高精准时间同步需求，提出了基于 Telemetry 架构的纳秒级时间同步系统。该系统借助数据中心的背景流量收集时间信息，结合离群因子检测算法对汇报上来的大量时间信息进行分析处理，达成一种集中式的纳秒级自动同步，便于后续全局网络调度。所提系统在可编程交换机上实现并进行了评估，结果显示在多跳之间及不同链路速率下，节点间均可以达到纳秒级的高精准时间同步。

Abstract

To solve the problems of the traditional local time synchronization architecture being disconnected from centralized management

requiring extra interaction overhead

meanwhile with less time data susceptible to outliers

the nanosecond level time synchronization system was proposed based on Telemetry for the high-precision time synchronization requirements of data center networks.Combined with the outlier factor detection algorithm

timestamp information within the background traffic of the data center was collected

the large amount of time information reported was processed and analyzed

and a centralized automatic synchronization with nanosecond level precision was eventually achieved

which was convenient for subsequent global network scheduling.The proposed system was implemented and evaluated on the programmable switch.Experimental results show that between multiple hops and at different link rates

the nodes can achieve high-precision time synchronization at the nanosecond level.

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references

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