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Impact Analysis of Flow Shaping in Ethernet-AVB/TSN and AFDX from Network Calculus and Simulation Perspective
Feng He1, Lin Zhao2, Ershuai Li3
1School of Electronic and Information Engineering, Beihang University, Beijing 100191, China. robinleo@buaa.edu.cn.
Sensors (Basel, Switzerland)
|May 23, 2017
Summary
Ethernet-AVB/TSN and AFDX are real-time communication technologies for transportation. The Credit-Based Shaper in Ethernet-AVB/TSN impacts flow delays, with benefits depending on traffic load and configuration.
Area of Science:
- Computer Engineering
- Network Engineering
- Transportation Systems
Background:
- Ethernet-AVB/TSN and AFDX are key technologies for real-time communication in transportation.
- AFDX uses fixed priority scheduling, while Ethernet-AVB/TSN offers fixed priority and time-triggered scheduling with a Credit-Based Shaper (CBS).
Purpose of the Study:
- Investigate the impact of the Credit-Based Shaper (CBS) on different priority flows in Ethernet-AVB/TSN.
- Analyze the effect of CBS bandwidth allocation on network performance.
- Compare Ethernet-AVB/TSN with AFDX in an automotive context.
Main Methods:
- Performance comparison through simulation in an automotive case study.
- Network calculus for modeling the shaping benefit of CBS.
- Analysis of shaping restriction and shaping benefit.
Main Results:
- CBS increases delay for its flows (shaping restriction) but decreases delay for others (shaping benefit).
- The effect of CBS is dependent on flow loads and bandwidth allocation.
- Higher loads of high-priority flows in AVB/TSN can improve performance for intermediate priority flows compared to AFDX.
Conclusions:
- CBS configuration and flow loads significantly influence network performance.
- Network calculus provides a method to model and understand CBS shaping benefits.
- Configuration suggestions for CBS bandwidth allocation are provided based on the analysis.
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