Latency (engineering)

About: Latency (engineering) is a research topic. Over the lifetime, 3729 publications have been published within this topic receiving 39210 citations. The topic is also known as: lag.

An Experimental Evaluation of Low Latency Congestion Control for mmWave Links

Abstract: Applications that require extremely low latency are expected to be a major driver of 5G and WLAN networks that include millimeter wave (mmWave) links. However, mmWave links can experience frequent, sudden changes in link capacity due to obstructions in the signal path. These dramatic variations in link capacity cause a temporary “bufferbloat” condition during which delay may increase by a factor of 2–10. Low latency congestion control protocols, which manage bufferbloat by minimizing queue occupancy, represent a potential solution to this problem, however their behavior over links with dramatic variations in capacity is not well understood. In this paper, we explore the behavior of two major low latency congestion control protocols, TCP BBR and TCP Prague (as part of L4S), using link traces collected over mmWave links under various conditions. Our evaluation reveals potential problems associated with use of these congestion control protocols for low latency applications over mmWave links.

A prototype router for the massively parallel computer RWC-1

Abstract: The RWC-1 is a massively parallel computer based on a multi-threaded architecture. This architecture requires extremely high communication performance with reasonable hardware cost. ln this paper, we first introduce a new class of direct interconnection networks called MDCE (Multidimensional Directed Cycles Ensemble extension). MDCE has many desirable features for RWC-1 including small degree, low latency, and high throughput. MDCE is thus adopted for a RWC-1 network. We have designed an MDCE router and fabricated an experimental VLSI chip. We explain the design details in this paper. The chip employs operating system support features as well as communication functions, and enables advanced resource management, A prototype chip with about 125,000 gates has been fabricated using 0.6-/spl mu/m CMOS gate array technology. Its clock runs at 50 MHz and a transmission rate of 300 M bytes per second per communication port is achieved.

Network Aware Composition for Internet of Thing Services

Abstract: To enhance the adoption of Internet of Things (IoT) philosophy for the internet, research into IoT service composition has gathered momentum. In a distributed IoT environment, identifying IoT service among a set of similar service offerings that meets both functional and performance requirements of an IoT application has become important. However, the performance of a service cannot be guaranteed. Therefore service’s QoS and network characteristics are required to aggregate IoT services. Most existing composition approaches only consider non-network related QoS properties at the application tier. However they do not consider the network parameters such as network latency at the application level in selection and composition of services. Therefore we propose two evolutionary algorithms for IoT service composition that consider not only QoS but also network latency at the IoT application layer. The algorithms are discussed and results of evaluation are presented. The results indicate that our algorithms are efficient in finding QoS optimal and low latency solutions.

SCORES: a scalable and parametric streams-based communication architecture for modular reconfigurable systems

Abstract: Parallel architectures have become an increasingly popular method in which to achieve high performance with low power consumption. In order to leverage these benefits, applications are decomposed into multiple computational modules (tasks) that collectively operate and communicate in parallel. In this paper, we present a scalable and highly parametric streams-based communication architecture for inter-module communication for FPGA-based systems - SCORES. This communication architecture improves on previous methods by providing increased application specialization and heterogeneous module clock frequencies, as well as providing a means for low latency communication and data throughput guarantees.

High-Performance Replicated Distributed Objects in Partitionable Environments

Abstract: This paper presents an implementation of replicated distributed objects in asynchronous environments prone to node failures and network partitions. This implementation has several appealing properties: It guarantees that progress will be made whenever a majority of replicas can communicate with each other; it allows minority partitions to continue providing service for idempotent requests; it offers the application the choice between optimistic or safe message delivery. Performance measurements have shown that our implementation incurs low latency and achieves high throughput while providing globally consistent replicated state machine semantics. The paper discusses both the protocols and interfaces to support efficient object replication at the application level.