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  • 1.
    Andreasson, Daniel
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Jönköping University, School of Engineering, JTH. Research area Embedded Systems.
    Slack-Time Aware Dynamic Routing Schemes for on-chip networks2007Licentiate thesis, monograph (Other academic)
    Abstract [en]

    Network-on-Chip (NoC) is a new on-chip communication paradigm for future IP-core based System-on-Chip (SoC), designed to remove a number of limitations of today’s on-chip interconnect solutions. A NoC interconnects cores by means of a packet switched micro-network, which improves scalability and reusability, resulting in a shorter time to market. A typical NoC will be running many applications concurrently, which results in shared network capacity between different kinds of traffic flows. Due to the diverse characteristic of applications, some traffic flows will require real-time communication guarantees while others are tolerant to even some loss of data. In order to provide different levels of Quality-of-Service (QoS) for traffic flows, the communication traffic is separated into different service classes. Traffic in NoC is typically classified into two service classes: the guaranteed throughput (GT) and the best-effort (BE) service class. The GT class offers strict QoS guarantees by setting up a virtual path with reserved bandwidth between the source (GT-producer) and destination (GT-consumer), called a GT-path. The BE class offers no strict QoS guarantees, but tries to efficiently use any network capacity which may become available from the GT traffic. The GT traffic may not fully utilize its bandwidth reservation if its communication volume varies, leading to time intervals where there is no GT traffic using the bandwidth reservation. These intervals are referred to as slack-time. If the slack can not be used this leads to unnecessarily reduced performance of BE traffic, since a part of the available network capacity becomes blocked. This thesis deals with methods to efficiently use the slack-time for BE traffic. The contributions include three new dynamic schemes for slack distribution in NoC. First, a scheme to inform the routers of a GT-path about available slack is evaluated. The GT-producer plans its traffic using a special playout buffer, and issues control packets containing the actual amount of slack-time available. The results show that this scheme leads to decreased latency, jitter and packet drops for BE traffic. Secondly, an extension to this scheme is evaluated, where slack is distributed among multiple GT-paths (slack distribution in space). This opens up the possibility to balance the QoS of BE traffic flows which overlap with the GT-paths. Thirdly, a scheme to distribute slack among the links of a GT-path (slack distribution in time) is proposed. In this approach, arriving GT-packets, at a certain router along the GT-path, can wait for a maximum defined amount of time. During this time, any waiting BE traffic in the buffers can be forwarded over the GT-path. The results confirm that this is especially important during high BE-traffic load, where this technique decreases the jitter of BE traffic considerably.

  • 2.
    Andreasson, Daniel
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Inbyggda System.
    Kumar, Shashi
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Inbyggda System.
    Improving BE traffic QoS using GT slack in NoC Systems2005In: Proceedings of 23th IEEE Norchip Conference, 21 - 22 Nov, Oulu, Finland, 2005Conference paper (Refereed)
    Abstract [en]

    Recently, network on chip (NoC) architectures are being

    proposed for implementing multi-core systems for realtime

    multi-media applications. The communication

    traffic of those systems will be a mix of guaranteed

    throughput (GT) and best effort (BE) traffic. GT traffic

    not only lead to under-utilization of communication links

    and routers, but also leads to degradation of QoS

    parameters for BE traffic. We propose a dynamic routing

    scheme for reducing jitter in the latency of BE traffic

    affected by the GT traffic. Our results from modeling and

    simulation indicate that a significant improvement in

    jitter can be achieved.

  • 3.
    Andreasson, Daniel
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Inbyggda System.
    Kumar, Shashi
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Inbyggda System.
    On improving Best-Effort throughput by better utilization of Guaranteed-Throughput channels in an on-chip communication system2004In: Proceedings of the NORCHIP 2004 conference, Oslo, 2004Conference paper (Refereed)
    Abstract [en]

    It is possible to concurrently run multiple

    applications on IP-core based SoC built using Network

    on Chip (NoC) paradigm. Some applications require

    predictable and guaranteed on-chip communication

    performance. In this paper we propose a new approach

    for using underutilized reservation of guaranteed

    throughput (GT) traffic to improve the performance of

    best effort (BE) traffic. We have modeled our scheme for

    a mesh topology NoC on a simulation platform. The

    results show that the proposed scheme leads to

    significant improvement in BE performance.

  • 4.
    Andreasson, Daniel
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Inbyggda System.
    Kumar, Shashi
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Inbyggda System.
    Slack-Time Aware Routing in NoC Systems2005In: Proceedings of International Symposium of Circuits and Systems, May 23-26, Kobe, Japan, 2005Conference paper (Refereed)
    Abstract [en]

    Efficient routing schemes are essential if Network on

    Chip (NoC) architectures are to be used for implementing

    multi-core systems for real-time multi-media applications.

    These systems will be characterized by internal communication

    traffic which is a mix of traffic requiring guaranteed

    throughput (GT) and other traffic requiring some other QoS

    properties like latency and less packet drops. Communication

    resources are generally reserved for providing GT

    performance. In this paper we propose a dynamic scheme for

    improving packet drop probability of other traffic by

    intelligently utilizing the under-utilized reserved

    communication resources of GT traffic. We demonstrate the

    effectiveness of our scheme by simulation.

  • 5.
    Andreasson, Daniel
    et al.
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Inbyggda System.
    Kumar, Shashi
    Jönköping University, School of Engineering, JTH, Computer and Electrical Engineering. Inbyggda System.
    STAR: An Efficient Routing Strategy for NoC with Mixed QoS Requirements2006In: Special Workshop on Future Interconnects and Network on Chip, Munich, Germany, 2006Conference paper (Refereed)
1 - 5 of 5
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