Browsing by Author "Kailas, Krishnan K."
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Item An Accurate Time-Management Unit for Real-Time Processors(1998-10-15) Kailas, Krishnan K.; Agrawala, Ashok K.Time management is an important aspect of real-time computation. Traditional high performance processors provide little or no support for management of time. In this report, we propose a time-management unit which can greatly help improve the performance of a real-time system. The proposed unit can be added to any processor architecture without affecting its performance. We also explain how the unit helps to solve the clock synchronization problems in a real-time network. (Also cross-referenced as UMIACS-TR-97-28)Item A Generic Architecture for Programmable Traffic Shaper for High Speed Networks(1998-10-15) Kailas, Krishnan K.; Agrawala, Ashok K.; Raghavan, S. V.Traffic shapers by preventing congestion and smoothing the traffic, play an important role in realizing the traffic control schemes employed in high speed networks to ensure the Quality of Service (QoS) requirements of the application. In this report, we present a generic architecture for programmable traffic shaper for high speed networks. The programmability of the proposed architecture is illustrated by implementing some of the existing traffic shaping schemes. The architectural design issues of the proposed scheme are described and discussed. (Also cross-referenced as UMIACS-TR-95-75)Item Temporal accuracy and modern high performance processors: A case study using Pentium Pro(1998-10-15) Kailas, Krishnan K.; Trinh, Bao; Agrawala, Ashok K.Real-time systems must be able to ensure temporally determinate execution of real-time tasks at run-time. By temporal accuracy, we refer to the timing accuracy with which the execution of a task can be started at a predetermined time. Temporally determinate execution of tasks on modern high performance processors is becoming more and more difficult because of the techniques used by these processors to boost their average performance. This report describes the experiments we have conducted to measure the temporal accuracy that can be achieved with the Pentium Pro processor. We present the results of these experiments and analyze these results to highlight the limitations of temporally determinate execution of programs on modern high performance processor architectures. (Also cross-referenced as UMIACS-TR-97-60)