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Dynamic DSCPs for heterogeneous QoS in DiffServ multicasting

Dynamic DSCPs for heterogeneous QoS in DiffServ multicasting

引用

Global Telecommunications Conference, 2002. GLOBECOM '02. IEEE

作者： A. Striegel G. Manimaran Dependable Computing & Networking Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA

The significant growths of group communications and QoS-aware applications over the Internet have accelerated the development of two key technologies, namely, multicasting and Differentiated Services (DiffServ). Although both are complementary technologies, their integration is a non-trivial task due to several architectural conflicts between them. The inherent heterogeneous nature of QoS multicasting further complicates this problem with the sender-driven nature of DiffServ. Thus, in this paper, we propose a method for providing heterogeneous QoS to multicast groups via dynamic DSCPs without per-group state information in the DiffServ core. We detail our approach as well as examine implications for an adaptive method for both multicast and unicast connections. Finally, we present simulation studies regarding the performance benefits of dynamic DSCPs in multicasting.

关键词： Diffserv networks Quality of service Intelligent networks computer networks Bandwidth Laboratories Application software IP networks Acceleration Spine

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A scalable QoS adaptation scheme for media servers 15

A scalable QoS adaptation scheme for media servers

引用

15th International Parallel and Distributed Processing Symposium, IPDPS 2001

作者： Striegel, A. Manimaran, G. Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University United States

ISBN: (纸本)0769509908

The issue of providing efficient media retrieval services has been an important problem in recent years. Among them, video-on-demand (VoD) is one of the most popular and challenging ones. An efficient solution to the VoD service problem should address the twin issues of scalability and client heterogeneity. In this paper, we propose a VoD server model, that is based on the parallel video server architecture and layered coding, to satisfy these twin issues. The proposed model dynamically adapts to the server load in order to maximize the number of clients (connections) admitted while maintaining a high quality for the already admitted connections. We study the adaptiveness our model by proposing promotion/demotion policies for quality adaptation. We also propose a performance metric, called marginal quality, that normalizes the quality (received) across heterogeneous connections. Finally, we evaluate the effectiveness of our model, in terms of connection acceptance rate, connection quality, and fairness in connection quality, through extensive simulation studies. © 2001 IEEE.

关键词： Video on demand

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A new fault-tolerant technique for improving schedulability in multiprocessor real-time systems 15

A new fault-tolerant technique for improving schedulability ...

引用

15th International Parallel and Distributed Processing Symposium, IPDPS 2001

作者： Al-Omari, R. Somani, A.K. Manimaran, G. Dependable Computing and Networking Laboratory Dept. of Electrical and Computer Engineering Iowa State University AmesIA50011 United States

ISBN: (纸本)0769509908

In real-time systems, tasks have deadlines to be met despite the presence of faults. Primary-Backup (PB) scheme is one of the most common schemes that has been employed for fault-tolerant scheduling of real-time tasks, wherein each task has two versions and the versions are scheduled on two different processors with time exclusion. There have been techniques proposed for improving schedulability of the PB-based scheduling. One of the more popular ones include Backup-Backup (BB) overloading, wherein two or more backups can share/overlap in time on a processor. In this paper we propose a new schedulability enhancing technique, called primary-backup (PB) overloading, in which the primary of a task can share/overlap in time with the backup of another task an a processor. The intuition is that, for both primary and backup of a task, the PB-overloading can assign an earlier start time than that of the BB-overloading, thereby increasing the schedulability. We conduct schedulability and reliability analysis of PB- and BB-overloading techniques through simulation and analytical studies. Our studies show that PB-overloading offers better schedulability (25% increase in the guarantee ratio) than that of BB-overloading, and offers reliability comparable to that of BB-overloading. The proposed PB-overloading is a general technique that can be employed in any static or dynamic fault-tolerant scheduling algorithm. © 2001 IEEE.

关键词： Real time systems

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An adaptive scheme for fault-tolerant scheduling of soft real-time tasks in multiprocessor systems 8th

引用

8th International Conference on High Performance computing, HiPC 2001

作者： Al-Omari, R. Somani, Arun K. Manimaran, G. Dependable Computing & Networking Laboratory Dept. of Electrical and Computer Engineering Iowa State University AmesIA50011 United States

ISBN: (纸本)3540430091

The scheduling of real-time tasks with primary-backup based fault-tolerant requirements has been an important problem for several years. Most of the known scheduling schemes are non-adaptive in nature meaning that they do not adapt to the dynamics of faults and task's parameters in the system. In this paper, we propose an adaptive faulttolerant scheduling scheme that has a mechanism to control the overlap interval between the primary and backup versions of tasks such that the overall performance of the system is improved. The overlap interval is determined based on the estimated primary fault probability and task's soft laxity. We also propose a new performance index that integrates schedulability (S) and reliability (R) into a single metric,called SR index. To evaluate the proposed scheme, we have conducted analytical and simulation studies under different fault and deadline scenarios,and found that the proposed adaptive scheme adapts to system dynamics and offers better SR index than that of the non-adaptive schemes. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Scheduling

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SSD: An affordable fault tolerant architecture for superscalar processors

SSD: An affordable fault tolerant architecture for superscal...

引用

Pacific Rim International Symposium on dependable computing, PRDC 2001

作者： Kim, Seongwoo Somani, Arun K. Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University AmesIA50011 United States

ISBN: (纸本)0769514146

This paper proposes an integrity checking architecture for superscalar processors that can achieve fault tolerance capability of a duplex system at much less cost than the traditional duplication approach. The pipeline of the CPU core (P-pipeline) is combined in series with another pipeline (V-pipeline), which re-executes instructions processed in the P-pipeline. Operations in the two pipelines are compared and any mismatch triggers recovery process. The V-pipeline design is based on replication of the P-pipeline, and minimized in size and functionality by taking advantage of control flow and data dependency resolved in the P-pipeline. Idle cycles propagated from the P-pipeline become extra time for the V-pipeline to keep up with program re-execution. For a large-scale superscalar processor, the proposed architecture can bring up to 61.4% reduction in die area and the average execution time increase is 0.3%. © 2001 IEEE.

关键词： Pipelines

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A scalable approach for DiffServ multicasting

A scalable approach for DiffServ multicasting

引用

IEEE International Conference on Communications (ICC)

作者： A. Striegel G. Manimaran Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University USA

The phenomenal growths of group communications and QoS-aware applications over the Internet have respectively accelerated the development of two key technologies, namely, multicasting and differentiated services (DiffServ). Although both are complementary technologies, the integration of the two technologies is a non-trivial task due to architectural conflicts between multicasting and DiffServ. We propose an approach for providing multicast support across a DiffServ domain that is scalable in terms of group size, network size, and number of groups. We analyze our approach in a detailed manner for feasibility, adaptiveness, and deployment considerations.

关键词： Diffserv networks Bandwidth Quality of service Educational institutions Web and internet services Resource management computer networks Laboratories IP networks Acceleration

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A scalable QoS adaptation scheme for media servers

A scalable QoS adaptation scheme for media servers

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： A. Striegel G. Manimaran Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University USA

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A scalable protocol for member join/leave in DiffServ multicast

A scalable protocol for member join/leave in DiffServ multic...

引用

Conference on Local computer Networks (LCN)

作者： A. Striegel G. Manimaran Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University USA

ISBN: (纸本)0769513212

The phenomenal growths of group communications and QoS-aware applications over the Internet have accelerated the development of two key technologies, namely, multicasting and Differentiated Services (DiffServ). Although both are complementary technologies, the integration of the two technologies is a non-trivial task due to architectural conflicts between multicasting and DiffServ. We propose a protocol for member join/leave in a DiffServ network that is scalable in terms of group size, network size, and number of groups. We detail our join/leave protocol for both intra-domain and inter-domain routing as well as the various different types of multicast trees (single source tree, shortest path tree, shared tree, many-to-many tree). Finally, we present simulation studies regarding the performance of our join/leave protocol.

关键词： Multicast protocols Diffserv networks Bandwidth Quality of service Web and internet services Educational institutions Intelligent networks computer networks Laboratories Application software

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A new fault-tolerant technique for improving schedulability in multiprocessor real-time systems

A new fault-tolerant technique for improving schedulability ...

引用

International Symposium on Parallel and Distributed Processing (IPDPS)

作者： R. Al-Omari A.K. Somani G. Manimaran Dependable Computing & Networking Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA

ISBN: (纸本)0769509908

关键词： Fault tolerant systems Real time systems Processor scheduling Fault tolerance computer networks Analytical models Scheduling algorithm Testing Dynamic scheduling Intelligent networks

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SSD: an affordable fault tolerant architecture for superscalar processors

SSD: an affordable fault tolerant architecture for superscal...

引用

Pacific Rim International Symposium on dependable computing

作者： Seongwoo Kim A.K. Somani Dependable Computing and Networking Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA

ISBN: (纸本)0769514146

The paper proposes an integrity checking architecture for superscalar processors that can achieve fault tolerance capability of a duplex system at much less cost than the traditional duplication approach. The pipeline of the CPU core (P-pipeline) is combined in series with another pipeline (V-pipeline), which re-executes instructions processed in the P-pipeline. Operations in the two pipelines are compared and any mismatch triggers the recovery process. The V-pipeline design is based on replication of the P-pipeline, and minimized in size and functionality by taking advantage of control flow and data dependency resolved in the P-pipeline. Idle cycles propagated from the P-pipeline become extra time for the V-pipeline to keep up with program re-execution. For a large-scale superscalar processor, the proposed architecture can bring up to 61.4% reduction in die area and the average-execution time increase is 0.3%.

关键词： Fault tolerance Circuit faults Costs Pipelines Logic computer architecture Redundancy Error correction codes Protection Microprocessors

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