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Efficient Support for High Traffic-Volumes of Short-Message Real-Time Communication Using an Active Ethernet Switch
Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS).
Högskolan i Halmstad, Akademin för informationsteknologi, Halmstad Embedded and Intelligent Systems Research (EIS), Centrum för forskning om inbyggda system (CERES).ORCID-id: 0000-0002-6526-3931
2004 (Engelska)Ingår i: Proceedings of the 10th International Conference on Real-time and Embedded Computing Systems and Applications (RTCSA’04), 2004, s. 517-533Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

There are several different types of communication traffic with real- time demands apparent in distributed industrial and embedded systems, for example, group communication and process synchronization. The length of these messages is often very short but the traffic volume might be really high. Standard network protocols do not normally reach very high utilization for such small messages. This paper presents a solution to efficiently support real-time short message communication over switched Ethernet. In our proposal, the Ethernet switch and the end-nodes are enhanced to combine several short messages into an Ethernet frame to improve the performance, and to give the short-message traffic real-time support on two levels, short-frame level and Ethernet frame level. Earliest Deadline First (EDF) scheduling is used in the switch and in the source nodes on both these two levels. We have characterized the performance of the network in terms of channel utilization and the number of accepted real-time channels, by simulations of the network assuming Fast Ethernet. We also show, by example, that we can reach an improvement of the possible short-message rate of 66%.

Ort, förlag, år, upplaga, sidor
2004. s. 517-533
Nyckelord [en]
Real-time, Real-time communication, Real-time systems, Ethernet switches
Nationell ämneskategori
Datorsystem
Identifikatorer
URN: urn:nbn:se:hh:diva-395Lokalt ID: 2082/719OAI: oai:DiVA.org:hh-395DiVA, id: diva2:237574
Konferens
International Conference on Real-time and Embedded Computing Systems and Applications (RTCSA’04), Göteborg, Sweden, Aug. 25-27, 2004
Tillgänglig från: 2007-01-12 Skapad: 2007-01-12 Senast uppdaterad: 2018-03-23Bibliografiskt granskad
Ingår i avhandling
1. Real-Time Communication Services for Distributed Computing over Switched Ethernet
Öppna denna publikation i ny flik eller fönster >>Real-Time Communication Services for Distributed Computing over Switched Ethernet
2004 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In modern and future parallel and distributed processing, a large part of computation overhead comes from communication. This can be minimized if the network protocol offers the user services that are aimed at specific types of communication used in these applications. Other important properties of distributed processing applications are time-deterministic latency and guarantees to meet deadlines. Moreover, an important trend is to implement distributed real-time applications on top of standard Ethernet based networks. Therefore, in this thesis, we focus on developing and analyzing how to efficiently support real-time communication services for distributed computing applications over switched Ethernet. The network architecture currently assumed is a switched Ethernet network with only one switch.

The work has resulted in proposed Switched Ethernet networks that offer additional features for parallel and distributed real-time processing. An active Ethernet switch concept is proposed to provide efficient support for different user services, including many-to-many communication and other group communication services with high traffic volumes of short messages. Meanwhile, the real-time support for these special communication patterns is addressed by incorporating deadline-based scheduling in the switch and the end nodes.

Moreover, this thesis addresses real-time services by proposing an alternative solution. In this proposal, the Earliest Deadline First (EDF) algorithm is only used in the source nodes to support real-time traffic with a guaranteed bit rate and end-to-end worst-case delay bound. The thesis also reports a feasibility analysis for hard real-time traffic, which also produces figures on the minimum buffer sizes in the switch to be able to guarantee real-time demands. Meanwhile, differentiation of heterogeneous traffic is considered in the proposed system by placing traffic into several priority classes with distinctly different QoS levels.

The performance of the proposed methods is evaluated in simulations and calculations. It is shown that the different Ethernet extensions, in many cases, are efficient choices for distributed computing systems.

Ort, förlag, år, upplaga, sidor
Göteborg: Chalmers tekniska högskola, 2004. s. x, 22
Serie
Technical report.L / School of Computer Science and Engineering, Chalmers University of Technology, ISSN 1651-4963 ; 37
Nyckelord
Switched Ethernet, Real-time, Parallel and distributed processing, Scheduling
Nationell ämneskategori
Datorsystem
Identifikatorer
urn:nbn:se:hh:diva-374 (URN)2082/698 (Lokalt ID)2082/698 (Arkivnummer)2082/698 (OAI)
Presentation
2004-11-17, Wigforssalen, Visionen, Kristian IV:s väg 3, Halmstad, 14:15 (Engelska)
Handledare
Projekt
EEERT-SAN
Forskningsfinansiär
KK-stiftelsen
Tillgänglig från: 2007-01-10 Skapad: 2007-01-10 Senast uppdaterad: 2018-03-23Bibliografiskt granskad

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