| 1. |
- Marau, Ricardo, et al.
(författare)
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Server-based real-time communications of Switched Ethernet
- 2008
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Ingår i: Proceedings of the 1st Workshop on Compositional Theory and Technology for Real-Time Embedded Systems (CRTS'08) in conjunction with the 29th IEEE International Real-Time Systems Symposium (RTSS'08), Barcelona, Spain.
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Konferensbidrag (refereegranskat)
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| 2. |
- Santos, Rui, et al.
(författare)
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A Demonstration of Hierarchical Scheduling over Ethernet
- 2011
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Ingår i: Real-Time SystemS @ Work, the Open Demo Session of Real-Time Techniques and Technologies of the 32nd IEEE Real-Time Systems Symposium (RTSS'11).
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Konferensbidrag (refereegranskat)
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| 3. |
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| 4. |
- Santos, Rui, et al.
(författare)
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Flexible, Efficient and Robust Real-Time Communication with Server-based Ethernet Switching
- 2010
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Ingår i: IEEE International Workshop on Factory Communication Systems - Proceedings, WFCS 2010. - 9781424454617 ; , s. 131-140
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Konferensbidrag (refereegranskat)abstract
- The information exchanged in Networked Embedded Systems is steadily increasing in quantity, size, complexity and heterogeneity, with growing requirements for arbitrary arrival patterns and guaranteed QoS. One of the networking protocols that is becoming more common in such systems is Ethernet and its real-time Ethernet variants. However, they hardly support all the referred requirements in an efficient manner since they either favour determinism or throughput, but not both. A potential solution recently proposed by the authors is the Server-SE protocol that uses servers to confine traffic associated to specific applications or subsystems. Such an approach is dynamically reconfigurable and adaptive, being more bandwidth efficient while providing compos ability in the time domain. This paper proposes integrating the servers inside the Ethernet switch, boosting both the flexibility and the robustness of Server-SE, allowing, for example, the seamless connection of any Ethernet node. The switch is an FTT-enabled Ethernet Switch and the paper discusses two specific ways of integrating the servers, namely in software or in hardware. These options are described and compared analytically and experimentally. The former favours flexibility in the servers design and management while the latter provides lower latency.
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| 5. |
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| 6. |
- Santos, Rui, et al.
(författare)
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Hierarchical server-based traffic scheduling in ethernet switches
- 2011
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Ingår i: ACM SIGBED Review. - : Association for Computing Machinery (ACM). - 1551-3688. ; 8:1, s. 68-69
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Tidskriftsartikel (refereegranskat)abstract
- Distributed Embedded Real-Time Systems (DERTS) are ever more complex, consisting of an increasing number of nodes with more functionality and handling more data. This scenario is pushing for paradigm changes in the methodologies to design complex DERTS. Namely, component-oriented design methodologies, exhibiting the composability property are considered an effective means to tackle the growing complexity of DERTS. Server-oriented architectures have proven to be an effective means to enable controlled resource sharing, providing composability among application components as well as between the application software and the hardware platform on which they execute.
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| 7. |
- Santos, Rui, et al.
(författare)
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Implementing Server-Based Communication within Ethernet Switches
- 2009
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Ingår i: Proceedings of the 2nd Workshop on Compositional Theory and Technology for Real-Time Embedded Systems (CRTS'09) in conjunction with the 30th IEEE International Real-Time Systems Symposium (RTSS'09). - Washington, DC, USA.
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Konferensbidrag (refereegranskat)
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| 8. |
- Santos, Rui, et al.
(författare)
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Improving the efficiency of Ethernet switches for real-time communication
- 2010
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Konferensbidrag (refereegranskat)abstract
- The growth of connectivity in general, including in networked embedded systems, is continuously increasing the amount and diversity of information that needs being exchanged among nodes. The arrival pattern of such traffic is also frequently bursty and jittered, negatively impacting the system performance. In this paper we focus on switched Ethernet and we aim at providing flow-based dynamic scheduling that allows handling bursty and jittered traffic in a bandwidth efficient way. For that we use adaptive resource-reservation, associating servers to flows or groups of flows that contain the impact that a misbehaving flow can have. These servers can be adapted on-line to make a better use of the available bandwidth.
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| 9. |
- Santos, Rui, et al.
(författare)
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On Hierarchical Server-based Communication with Switched Ethernet
- 2010
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Ingår i: Proceedings of the 15th IEEE International Conference on Emerging Technologies and Factory Automation, ETFA 2010. - 9781424468508
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Konferensbidrag (refereegranskat)abstract
- Ethernet is becoming a common network technology for industrial and factory automation systems and, in recent years, a big effort has been made in enabling real-time communications using Ethernet technology. Many of these systems are complex, extend over relatively large places and/or integrate a significant number of nodes, thus requiring the use of multiple switches (hop). In this paper we look into the usage of Flexible Time-Triggered (FTT) enabled Ethernet switches in this class of systems, more specifically using the recently proposed server-based scheduling mechanism supported by this protocol. The paper proposes and validates a resource reservation protocol, presents a method for computing the end-to-end deadlines and discusses possible strategies for the deadline partitioning.
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| 10. |
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