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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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A case for scalable multicast tree migration

A case for scalable multicast tree migration

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

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

The proliferation of QoS-aware group applications coupled with the limited availability of network resources demands efficient mechanisms to support QoS multicasting. During a life-cycle of a multicast session, three important events can occur: membership dynamics, network dynamics, and traffic dynamics. The first two are concerned with maintaining a good quality (cost) multicast tree taking into account dynamic join/leave of members, and changes in network topology due to link/node failures/additions, respectively. The third aspect is concerned with flow, congestion, and error control. There have been many solutions proposed for dealing with each of these issues. However, the issue of tree migration has not been addressed as part of these solutions. In this paper, we highlight the importance of tree migration as a mechanism for handling membership and network dynamics in core-based I multicasting, prove that it is NP-complete, and propose four heuristic algorithms for it. The proposed algorithms are evaluated under two performance metrics: service disruption and resource wastage. Our simulation studies show that two of the algorithms offer comparable performance to that of the other two, in addition to being highly scalable and easily implementable.

关键词： computer aided software engineering Multicast protocols Routing protocols Multicast algorithms Quality of service Multicast communication Switches computer networks Laboratories Application software

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A generalized framework for analyzing time-space switched optical networks

A generalized framework for analyzing time-space switched op...

引用

IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

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

ISBN: (纸本)0780370163

Previous advances in photonic switching have paved the way for realizing all-optical time switched networks. The current technology of wavelength division multiplexing (WDM) offers bandwidth granularity that match peak electronic transmission speed by dividing the fiber bandwidth into multiple wavelengths. However, the bandwidth of a single wavelength is too large for certain traffic. Time division multiplexing (TDM) allows multiple traffic streams to share the bandwidth of a wavelength efficiently. While introducing wavelength converters and time slot interchangers improve the network blocking performance, it is often of interest to know the incremental benefits offered by every additional stage of switching. As all-optical networks in future are expected to employ heterogeneous switching architectures, it is necessary to have generalized network model that allows one to study these networks under a unified framework. In this paper, a network model, called the Trunk Switched Network (TSN), is proposed to facilitate modeling and analysis of such networks. An analytical model for evaluating the blocking performance of a class of TSN's has also been developed. Using the analytical model, it is shown that a significant performance improvement is obtained with a time-space switch with no wavelength conversion at each node in a multi-wavelength TDM switched network.

关键词： Optical fiber networks Optical wavelength conversion Bandwidth Wavelength division multiplexing Telecommunication traffic Time division multiplexing Wavelength conversion WDM networks All-optical networks Analytical models

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Differentially secure multicasting and its implementation methods

Differentially secure multicasting and its implementation me...

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International Conference on computer Communications and Networks (ICCCN)

作者： S. Holeman G. Manimaran J. Davis Dependable Computing & Networking Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA Information Systems Security Laboratory Department of Electrical and Computer Engineering Iowa State University Ames IA USA

Though the areas of secure multicast group architecture, key distribution and sender authentication are under scrutiny, one topic that has not been explored is how to integrate these with multilevel security. Multilevel security is the ability to distinguish subjects according to classification levels, which determines to what degree they can access confidential objects. In the case of groups, this means that some members can exchange messages at a higher sensitivity level than others. The Bell-La Padula model outlines the rules of these multilevel accesses (see Bell, D. and La Padula, L., MITRE Report, M74-244, MTR 2547 v2, 1973). In multicast groups that employ multilevel security, some of these rules are not desirable, so a modified set of rules is developed and is termed differential security. Also, this paper proposes three methods to set up a differentially secure multicast group: (1) naive approach, (2) multiple tree differential security (DiffSec) approach, and (3) single DiffSec tree approach. Our simulation studies show that both single and multiple DiffSec tree approaches offer similar performance in terms of bandwidth consumption, which is significantly better than that of the naive approach. We also discuss the suitability of the schemes, taking into account scalability and implementation issues.

关键词： Multilevel systems Security Cryptography computer networks Distributed computing Laboratories Bandwidth Scalability Multicast communication Information systems

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Binary decision diagrams for efficient hardware implementation of fast IP routing lookups

Binary decision diagrams for efficient hardware implementati...

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International Conference on computer Communications and Networks (ICCCN)

作者： R. Sangireddy A.K. Somani Department of Electrical and Computer Engineering dependable computing and nrtworking Laboratory Iowa state university Ames IA USA

With an immense continuous growth in Internet traffic, the demand for routers that perform IP routing at high speed and throughput is ever increasing. The key issue in the router performance is the IP routing lookup mechanism based on the longest prefix matching scheme. Earlier works on fast IPv4 routing table lookup are based on content addressable memory (CAM), memory lookups and CPU caching. These schemes depend on the memory access technology which limits their performance. Besides, these address lookup schemes designed for the IPv4 32-bit address mostly are not extensible to adapt to the forthcoming IPv6 where the IP address is 128 bits long. The paper presents a binary decision diagrams based optimized combinational logic for an efficient implementation of a fast address lookup scheme in reconfigurable hardware. The experimental results show that, for the 32-bit IP address large MAE-east routing table, the number of redundant nodes is more than 99.99% in constructing the binary decision tree. With the binary encoding of the output port, an additional 36% reduction is obtained in the number of effective nodes. Besides the performance of the scheme, issues relating to routing table update and the scalability to IPv6 are discussed.

关键词： Data structures Boolean functions Hardware Routing Internet Throughput Table lookup Associative memory computer aided manufacturing CADCAM

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Security, interoperability, and quality of service aspects in designing a telecommunications platform for virtual laboratories

Security, interoperability, and quality of service aspects i...

引用

Canadian Conference on electrical and computer engineering (CCECE)

作者： C. Levert S. Pierre Mobile Computing and Networking Research Laboratory LARIM Ecole PolytechniqueDepartment of Electrical and Computer Engineering Ecole Polytechnique Montreal QUE Canada

The distributed processing and access requirements in implementing distributed virtual laboratories imply a number of challenges related to security, interoperability, and quality of service. This paper explores these aspects, then accounts for them in a distribution model comprised of five schemes: one for each of these aspects as well as processing and data storage distribution.

关键词： Quality of service Laboratories Data security computer networks Telecommunication computing Intelligent networks Mobile computing Distributed processing Memory Humans

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Himap: Architecture, features, and hierarchical model specification techniques 10th

Himap: Architecture, features, and hierarchical model specif...

引用

10th International Conference on Modelling Techniques and Tools for computer Performance Evaluation, Tools 1998

作者： Sridharan, Murari Ramasubramanian, Srinivasan Somani, Arun K. Dependable Computing Laboratory Department of Electrical and Computer Engineering Iowa State University AmesIA50011 United States

ISBN: (纸本)3540649492

Accurate analysis of complex systems for their reliability and performance is a challenging task. Development of powerful and easy-to-use tools allow engineers and system designers to accurately model such systems. Several tools have been developed addressing these needs, HIMAP is one such tool that helps analyze system behavior that are used in multi-phased missions and in systems that employ scheduled maintenance. The tool accounts for the effects of phase changes, that may include configuration and behavior changes, and maintenance of components. In this paper, we describe the most important features of HIMAP and hierarchical model specification techniques that al- low easy development and solution of models. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Specifications

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Hierarchical stochastic reward net solver package 10th

Hierarchical stochastic reward net solver package

引用

10th International Conference on Modelling Techniques and Tools for computer Performance Evaluation, Tools 1998

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

ISBN: (纸本)3540649492

This paper describes the design and application of the Hierarchical Stochastic Reward Nets Solver Package (HSP) to compute system reliability, availability, maintainability, and other system performance metrics. This enables us to model systems with hierarchy and/or modular redundancy efficiently. © Springer-Verlag Berlin Heidelberg 1998.

关键词： Stochastic systems

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Scalable hardware priority queue architectures for high-speed packet switches

Scalable hardware priority queue architectures for high-spee...

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Real-Time Technology and Applications Symposium

作者： S.-W. Moon K.G. Shin J. Rexford Real-Time Computing Laboratory Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI USA Network Mathematics Research Networking and Distributed Systems AT and T Research Laboratories Murray Hill NJ USA

In packet-switched networks, queueing of packets at the switches can result when multiple connections share the same physical link. To accommodate a large number of connections, a switch can employ link-scheduling algorithms to prioritize the transmission of the queued packets. Due to the high-speed links and small packet sizes, a hardware solution is needed for the priority queue in order to make the link schedulers effective. But for good performance, the switch should also support a large number of priority levels (P) and be able to buffer a large number of packets (N). So a hardware priority queue design must be both fast and scalable (with respect to N and P) in order to be implemented effectively. In this paper we first compare four existing hardware priority queue architectures, and identify scalability limitations on implementing these existing architectures for large N and P. Based on our findings, we propose two new priority queue architectures, and evaluate them using simulation results from Verilog HDL and Epoch implementations.

关键词： Packet switching Switches Traffic control Scheduling algorithm Asynchronous transfer mode Hardware design languages Communication system traffic control computer architecture Moon Real time systems

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Mobility Aware Technologies and Applications 1

引用

丛书名： Lecture Notes in computer Science

1000年

作者： Thomas Magedanz Ahmed Karmouch Samuel Pierre Iakovos Venieris

ISBN: (数字)9783540320319

ISBN: (纸本)9783540294108

The beginning of the twenty-first century is characterized by global markets, and the mobility of people is becoming an important fact of life. Consequently, the mobile user is demanding appropriate technical solutions to make use of customized information and communication services. In this context the notion of next-generation networks (NGNs), which are driven by the convergence of the entertainment sector, the mobile Internet, and fixed/mobile telecommunications, is emerging. Such NGNs are aggregating a variety of different access networks and supporting the seamless connection of an open set of end-user devices, and due to the adoption of an all-IP network paradigm they enable a much better integration of voice and data services. Coincidently the buzzword ‘fixed mobile convergence’ (FMC) describes the current trend towards providing common services across fixed and mobile networks resulting in the medium term in the full integration of fixed and mobile telecommunication networks. The adoption of appropriate middleware technologies and the provision of - called service delivery platforms driven by the ongoing innovation in the field of information technologies provides today the technical foundation for supporting terminal, personal and service mobility and thus the implementation of real seamless information and communication services. Furthermore, users are nowadays looking, in light of an omnipresent service environment, for a much higher degree of customization and context awareness in the services they use. The papers in this volume look at these enabling mobility-aware technologies and their use for implementing mobility-aware and context-aware applications.

关键词： Theory of Computation computer Communication Networks Information Systems Applications (incl. Internet) Information Storage and Retrieval Multimedia Information Systems User Interfaces and Human computer Interaction

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