Modeling the Throughput of the Linux-Based Agile-SD Transmission Control Protocol

通过以太网链路将测量数据从FPGA高效传输到嵌入式系统

Efficient transmission of measurement data from FPGA to embedded system via Ethernet link

本文提出了一种由FPGA IP核、简单网络协议和Linux设备驱动程序组成的系统，能够通过专用以太网（由单个网段或通过以太网交换机连接的几个网段组成）从低资源的FPGA芯片向基于Linux的嵌入式计算机系统进行高效可靠的数据传输。嵌入式系统可以可选地处理所获取的数据，并使用标准网络协议进一步分发它们。所提出的设计目标是具有成本效益的多通道数据采集系统，其中多个基于FPGA的前端板（FEB）应将采集的数据流传输到计算机网络，负责其最终处理和存档。由于使用廉价的以太网网络基础设施，所提出的解决方案允许最小化数据集中的成本。这项工作主要集中在FPGA中的资源消耗最小化，并在基于Linux的系统中的确认延迟最小化-这允许实现高吞吐量，尽管使用廉价的FPGA芯片与小的内部存储器。

Agile Network Access Control in the Container Age

Linux Containers, such as those managed by Docker, are an increasingly popular way to package and deploy complex applications. However, the fundamental security primitive of network access control for a distributed microservice deployment is often ignored or left to the network operations team. High-level application-specific security requirements are not appropriately enforced by low-level network access control lists. Apart from coarse-grained separation of virtual networks, Docker neither supports the application developer to specify nor the network operators to enforce fine-grained network…

Cocoa: Congestion Control Aware Queuing

Recent model-based congestion control algorithms such as BBR use repeated measurements at the endpoint to build a model of the network connection and use it to achieve optimal throughput with low queuing delay. Conversely, applying this model-based approach to Active Queue Management (AQM) has so far received less attention. We propose the new AQM scheduler cocoa based on fair queuing, which adapts the buffer size depending on the needs of each flow without requiring active participation from the endpoint. We implement this scheduler for the Linux kernel and show that it interacts well with th…

Trading Throughput for Freshness: Freshness-Aware Traffic Engineering and In-Network Freshness Control

In addition to traditional concerns such as throughput and latency, freshness is becoming increasingly important. To stay fresh, applications stream status updates among their components. Existing studies propose the metric age of information (AoI) to gauge the freshness and design systems to achieve low AoI. Despite active research in this area, existing results are not applicable to general wired networks for two reasons. First, they focus on wireless settings where AoI is mostly affected by interference and collision while queueing is more dominant in wired settings. Second, the legacy drop…

HetNetwork Coding: Scaling Throughput in Heterogeneous Networks using Multiple Radio Interfaces

The explosive demand for data has called for solution approaches that range from spectrally agile cognitive radios with novel spectrum sharing, to use of higher frequency spectrum as well as smaller and denser cell deployments with diverse access technologies, referred to as heterogeneous networks (HetNets). Simultaneously, advances in electronics and storage, has led to the advent of wireless devices equipped with multiple radio interfaces (e.g. WiFi, WiMAX, LTE, etc.) and the ability to store and efficiently process large amounts of data. Motivated by the convergence of HetNets and multi-pla…

在ns-3模拟器中实现L4S架构

Implementing the L4S Architecture in the ns-3 Simulator

本文在ns-3中实现L4S架构的端主机协议，重点移植Linux内核中的TCP Prague并集成AccECN信号，解决内核逻辑适配难题，验证了模拟器在复杂L4S性能评估中的准确性。

2BRobust——缓解CPU竞争下虚拟机中TCP BBR的性能退化

2BRobust -- Mitigating TCP BBR Performance Degradation in Virtual Machines under CPU Contention

研究在CPU竞争下BBR在虚拟机中的性能退化问题，开发测量框架揭示其吞吐量在竞争中下降，提出BBR补丁通过监控字节和调整速率来缓解问题，避免互联网范围转变损害整体健壮性。

Achieveing reliable UDP transmission at 10 Gb/s using BSD socket for data acquisition systems

User Datagram Protocol (UDP) is a commonly used protocol for data transmission in small embedded systems. UDP as such is unreliable and packet losses can occur. The achievable data rates can suffer if optimal packet sizes are not used. The alternative, Transmission Control Protocol (TCP) guarantees the ordered delivery of data and automatically adjusts transmission to match the capability of the transmission link. Nevertheless UDP is often favored over TCP due to its simplicity, small memory and instruction footprints. Both UDP and TCP are implemented in all larger operating systems and commer…

Implementation and Evaluation of Data Center Congestion Controller with Switch Assistance

In this work, we provide the design and implementation of a switch-assisted congestion control algorithm for data center networks (DCNs). In particular, we provide a prototype of the switch-driven congestion control algorithm and deploy it in a real data center. The prototype is based on few simple modifications to the switch software. The modifications imposed by the algorithm on the switch are to enable the switch to modify the TCP receive-window field in the packet headers. By doing so, the algorithm can enforce a pre-calculated (or target rate) to limit the sending rate at the sources. The…

Elastic-TCP: Flexible Congestion Control Algorithm to Adapt for High-BDP Networks

In the last decade, the demand for Internet applications has been increased, which increases the number of data centers across the world. These data centers are usually connected to each other using long-distance and high-speed networks. As known, the Transmission Control Protocol (TCP) is the predominant protocol used to provide such connectivity among these data centers. Unfortunately, the huge bandwidth-delay product (BDP) of these networks hinders TCP from achieving full bandwidth utilization. In order to increase TCP flexibility to adapt for high-BDP networks, we propose a new delay-based…