Modular Reference Implementation of an IP-DSLAM

Sauer, Christian; Gries, Matthias; Sonntag, Sören

doi:10.1109/iscc.2005.106

Cited by 8 publications

(8 citation statements)

References 13 publications

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“…In general, these latencies can be derived by simulating kernels, static analysis, or from worst-case requirements. In our case, a waiting time of 18.7 μs has been derived, using the method described in [25], for the upstream direction. We derived a downstream latency of 13.8 μs by summing up all estimated latencies of the system in downstream direction.…”

Section: Simulation Setupmentioning

confidence: 99%

SystemQ: Bridging the gap between queuing-based performance evaluation and SystemC

Sonntag

Gries

Sauer

2007

Des Autom Embed Syst

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During early design phases performance evaluation becomes increasingly important since major system-level decisions, such as the allocation of hardware resources and the partitioning of functionality onto architecture building blocks, affect the quality of the design significantly. Quantitative analysis is hard to achieve due to growing complexities, heterogeneity, and concurrency of modern embedded systems. We propose the use of multiclass queuing networks during the specification phase of the design flow for modeling data-flow oriented systems. Starting from an executable high-level queuing model our evaluation framework SystemQ 1 enables successive and systematic refinement of behavior and structure towards established TLM and RTL models based on SystemC. We demonstrate why SystemQ's multiclass queuing networks are a natural and feasible abstraction for evaluating network processing platforms. In particular we reveal the impact of scheduling policies on the Quality-of-Service, such as the residence time of network traffic in the system. In our case study, we show how stepwise refinement can reduce memory and latency bounds by up to two orders of magnitude and how the choice of only one queuing discipline can affect these properties. The investigated simulation models run in the range of 1 : 100 to 1 : 1 of real-time on a common off-the-shelf Linux PC. 1 Parts of this paper are based on [26] and are hereby published with permission.Springer 92 S. Sonntag et al.

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Section: Simulation Setupmentioning

confidence: 99%

SystemQ: Bridging the gap between queuing-based performance evaluation and SystemC

Sonntag

Gries

Sauer

2007

Des Autom Embed Syst

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“…We apply the Click/CRACC framework to the domain of access networks and model a complete IP based DSL access multiplexer (DSLAM) [10] on the functional level in Click. We use Click for the functional verification of the model and the CRACC execution profiles on embedded processors for further design space exploration.…”

Section: Case Studymentioning

confidence: 99%

Modular domain-specific implementation and exploration framework for embedded software platforms

Sauer

Gries

Sonntag

2005

Proceedings of the 42nd Annual Conference on Design Automation - DAC '05

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This paper focuses on designing network processing software for embedded processors. Our design flow CRACC represents an efficient path to implementation based on a modular application description, while avoiding much of the overhead of existing component-based techniques. We illustrate results for a real-world application implementing a full IP-based DSL Access Multiplexer (IP-DSLAM) system. We quantify overhead and optimization potential incurred by our modular implementation. We also point out how CRACC can be deployed for HW-SW partitioning and design space exploration.

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“…We need to develop a reference application that must capture the following trends in access networks [19]:…”

Section: Trendsmentioning

confidence: 99%

“…We have defined a set of line and trunk card configurations in terms of number of ports and supported bandwidth for representative subscriber line technologies: ADSL, VDSL(2+), and SHDSL. Our traffic mix has an average packet length of about 260 Byte versus 64 Byte for the worst-case (see [19]). …”

Section: Traffic Scenariosmentioning

confidence: 99%

“…Each task may contain several Click elements. In [19] we show how eleven primary tasks can be used to implement an IP-DSLAM, which distributes the processing among line and trunk cards so that most processing is done near the ingress port of network traffic. Due to the modular nature of our application representation, centralized or decentralized organizations can quickly be modeled as well.…”

Section: System Functionalitymentioning

confidence: 99%

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