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Providing the optimal configuration for a software router poses a lot of technical challenges that do not present in the dedicated hardware router. One of them is how to characterize performance varying due to different configurations on commodity hardware. This paper addresses the problem of configuring a software router that provides the minimum of average packet latency. Since changing all combinations...
Traditionally, network core devices are simple and the complexity is in the end-hosts. With the rise of Software- Defined Networking, this changes and complex functions are moved into the network core. This paper presents Transparent Transmission Segmentation (TTS), which is able to improve performance by executing parts of network functions at the core. An implementation for segmenting TCP connections...
Programmable Logic Controllers (PLCs) are specialized computing systems for the control and monitoring of distributed industrial devices. Aiming for a highly connected industrial Internet-of-Things (IoT) ecosystem, PLCopen OPC Unified Architecture (UA) specification has been released. This paper presents the implementation and evaluation of a PLCopen OPC-UA software component for industrial control...
Network Function Virtualization (NFV) brings agility and flexibility delivering network services with cost efficiency to network operators. As an emerging technology, it also presents several challenges, among them, ensuring high performance for virtualized network functions, based on software implementation and running on standard IT servers, instead of custom hardware appliances. In this article,...
Long-tail latency of web-facing applications continues to be a serious problem. Most of the previously published research addresses two classes of long latency problems: uneven workloads such as web search, and resource saturation in single nodes. We describe an experimental study of a third class of long tail latency problemsthat are specific to distributed systems: Cross-Tier Queue Overflow (CTQO)...
Due to the expensive hardware and complex management of the traditional middlebox, a concerted effort towards the virtualized middlebox has been launched in both academia and industry. In this paper, we propose a unified middlebox model, MBBrick, which is composed of three operation modules (classifier, rewriter, forwarder) and a control module (the mcontroller). We then design a language, MG, to...
Network Function Virtualization (NFV) is an emerging network architecture that employs the concept of virtualization and allows the consolidation of many network services on top of an industry standard off-the-shelf server. This decoupling of network functions and services from dedicated and expensive hardware appliances has led the Enterprise and Service Providers to increasingly make use of Virtualized...
Uploading of huge files to cloud servers through mobile communication has been becoming more popular in recent years. However, current uploading throughput is frequently limited due to bottlenecks in server processing ability and/or narrow bandwidth sections of networks. For this study, we aimed to improve the user experience of uploading in future wireless access environments. We propose a novel...
Network function virtualization (NFV) raises new possibilities for embedding data plane processing functions, e.g., firewalls, NAT, packet forwarding, etc., on commodity hardware. However, the advantages of flexibility, scalability and low cost of commodity hardware come at a price, such as resource over-provisioning, because the performance of softwarized network functions on shared resources is...
This paper cover the importance of performance testing of the web application. The performance of any web application has been depend on the some different type of the testing process like load testing, soak testing, smoke testing and stress testing etc. In this paper we applied smoke testing on a web application. This web application has been developed for the customer before delivering the software...
With the recent rise in cloud computing, applications are routinely accessing and interacting with data on remote resources. As data sizes become increasingly large, often combined with their locations being far from the applications, the well known impact of lower TCP throughput over large delay-bandwidth product paths becomes more significant to these applications. While myriads of solutions exist...
We propose and evaluate RoCE (RDMA over Converged Ethernet) as a low-latency back-plane for horizontally scaled software router nodes. By exploring combinations of design choices in developing internal fabric for software routers, we select a set of parameters and packet I/O APIs that yield the lowest latency and highest throughput. Using the optimal settings derived, we measure and compare latency...
The web today is a growing universe of interlinked web pages and web apps, teeming with videos, photos, and interactive content. Over time web technologies have evolved to give web developers the ability to create new generations of useful and immersive web experiences. The most important technology in realizing this shift is Ajax (Asynchronous Javascript and XML). Ajax is a major breakthrough in...
In the Software Defined Network (SDN) ecosystem, the controller remains the cornerstone of the architecture and the critical point of its success. That is why performance concerns have existed throughout the history of SDN and controller development. This paper aims at making a reality check on the current performance achieved by mainstream open source controllers. The measurements are carried out...
With the Radio Access Network (RAN) market moving away from the use of special-purpose hardware and towards a cloud implementation, there are many challenges and opportunities apparent in this shift. Use of commodity processing hardware offers benefits but also challenges given the real-time nature of radio access networks. Centralized processing offers operational savings in system management and...
Due to the high complexity in software hierarchy and the shared queue & lock mechanism for synchronized access, existing I/O stack for remote target access in FCoE-based SAN storage becomes a performance bottleneck, thus leading to a high I/O overhead and limited I/O scalability in multi-core servers. For scalable performance, existing works focus on improving the efficiency of lock algorithm...
VXLAN (Virtual extensible Local Area Network) is an edge-overlay model that uses L2-in-L3 tunneling protocol. It has attracted attentions for multi-tenant datacenter networks. For the deployment of VXLAN in legacy networks, networks can include VXLAN gateways which forward traffic between VXLAN and non-VXLAN environments. This paper proposes the design of VXLAN gateways which are not in servers, but...
The Data Acquisition (DAQ) system of LHCb is a complex real-time system. It will be upgraded to provide LHCb with an all-software, trigger-free readout starting from 2020. Consequently, more CPU power in the form of servers will be needed and the DAQ network will grow to a capacity of 40 Tbps. A PC-based readout system would receive data incoming from the detector, which would then be scattered across...
High-performance parallel storage systems, such as those used by supercomputers and data centers, can suffer from performance degradation when a large number of clients are contending for limited resources, like bandwidth. These contentions lower the efficiency of the system and cause unwanted speed variances. We present the Automatic Storage Contention Alleviation and Reduction system (ASCAR), a...
Broadband Remote Access Servers (BRASes) are crucial middleboxes in DSL access networks, providing the first IP point in the network for subscribers and enforcing operator policies. The number of functions provided by BRASes, combined with the key role they play in the network, means that these devices are expensive, difficult to change, and constitute a single point of failure. In order to overcome...
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