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- Iqbal, Zahid, et al.
(author)
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Implementing Hierarchical Scheduling on COTS Ethernet Switches Using a Master/Slave Approach
- 2012
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In: 7th IEEE International Symposium on Industrial Embedded Systems (SIES'12), Conference proceedings. - 9781467326834 - 9781467326858 ; , s. 76-84
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Conference paper (peer-reviewed)abstract
- Hierarchical scheduling is instrumental to efficiently deploy component-based designs and achieve composability. It allows partitioning resources into multiple levels, hiding the complexity within each partition behind its respective interface. In this paper we focus on the network resource, particularly on Ethernet using ordinary COTS switches, and we show how hierarchical scheduling can be efficiently deployed using a master/slave approach that enforces the temporal properties of the partitions. We use the FTT-SE protocol for being open source and a bandwidth efficient master/slave alternative currently available for real-time communication over Ethernet. We present a response-time analysis for the traffic submitted within each partition and we validate it using experimental results obtained from a prototype implementation. In particular, the results highlight the strong partitioning capabilities of our approach, with full temporal isolation across partitions in different branches of the hierarchy.
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| 3. |
- Iqbal, Zahid, et al.
(author)
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Implementing Virtual Channels in Ethernet using Hierarchical Sporadic Servers
- 2013
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In: Proc <em>International Workshop on Real-Time Networks</em>. - Paris, France.
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Conference paper (peer-reviewed)abstract
- Composability is an important property to build complex applications. One important technique to achieve composability, particularly in the time domain, is multi-level hierarchical server-based design. However, composability must not only be supported among components sharing computing resources but also in their interactions. In this paper we implement hierarchical server-based traffic scheduling within the Flexible Time-Triggered Switched Ethernet (FTT-SE) protocol. The novelty in this work is the use of hierarchical sporadic servers in such setting. We report an efficient usage of the network bandwidth, short reponse times and the temporal isolation across servers.
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| 4. |
- Marau, Ricardo, et al.
(author)
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Controlling Multi-Switch Networks for Prompt Reconfiguration
- 2012
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In: IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS. - 9781467315739 ; , s. 233-242
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Conference paper (peer-reviewed)abstract
- Recent trends in distributed embedded systems, such as those found in avionics and trains, have shown an increase in the amount and heterogeneity of the information that needs to be exchanged, together with a growing importance of supporting dynamic reconfiguration and adaptive behaviors. In this paper we focus on Ethernet technologies with real-time reconfiguration support and we address the case of middle-size networking infrastructures with a few switches. We use the FTT-SE protocol with the needed adaptations to support dynamic heterogeneous real-time transactions in multi-hop networks. The paper presents a worst-case response-time analysis that provides timeliness guarantees, improving the results obtained with another previous analysis, decreasing the needed network capacity for guaranteed schedulability by 25% on average. Practical experiments and simulation results validate the proposed approach and analysis.
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