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Virtualization technologies in cloud computing have been developing rapidly nowadays. One of their fundamental technologies is network virtualization. In order to increase bandwidth, link aggregation can be applied with network virtualization. It can balance the bandwidth of multiple virtual machines. In this paper, we purpose a high performance network virtualization model for multiple network adapters...
We have conducted an empirical study of the latest 5GHz IEEE 802.11wireless LAN (WLAN) variants of 802.11n (5GHz) and 802.11ac (Wave 1), underdifferent cell load conditions. We have considered typicalconfigurations of both protocols on a Linux testbed. Under light load, there is no clear difference between 802.11n and 802.11ac in terms ofperformance and energy consumption. However, in some cases of...
We provide an empirical evaluation of an IEEE 802.11ac Wireless Local Area Network (WLAN) cell with Multiple User Multiple Input Multiple Output (MU-MIMO) technology. We conducted our experiments on a testbed comprising consumer equipment under different office scenarios using 40MHz and 80MHz channels. This is the first performance study of MU-MIMO with 802.11ac in an operational scenario using a...
An emerging usage is to rely on mobile devices (Smartphones or tablets) for large-scale events. They can be used for many applications like live voting or chatting, but also to access all the data related to an event. However, in such case, handling mobile devices trying to access data simultaneously is difficult. A Wi-Fi access point can only handle a limited amount of devices. Current solutions,...
These days, microservice architecture is widely used in the design and development of many real-time, critical, and large-scale online services. These services are typically deployed using Docker containers on cloud platforms. Container technology supports the deployment of these services with high portability, scalability, and performance, when compared to deploying them using virtual machines (i...
The number of commuters and job-related travelers on public transport is constantly increasing. Often, these spend their time traveling working or consuming news. Consequently demands on mobile network access are rising. Cellular networks, in particular as experienced from within trains, often lack the desired performance. The underlying study exemplary analyses the cellular network quality on a popular...
Most Information Technology (IT) services nowadays rely on one or multiple data centers. In this paper, we propose a Quality of Service (QoS) scheme for Intra/Inter data center communications systems. The proposed scheme is based on differentiation of traffic into different class categories. The differentiation is based on the source of traffic as well as the specific traffic's requirements. We conduct...
As processor power density increases, thermal and power control becomes critical for packet processing on a processor. In “run-to-finish” applications, power consumption is stable and temperature simply rises to saturation point and then stabilizes. But, network applications feature ON/OFF execution pattern, which causes frequent temperature and power consumption changes in the processor. We propose...
Performance isolation is an important goal in server-class environments. Partitioning the last-level cache of a chip multiprocessor (CMP) across co-running applications has proven useful in this regard. Two popular approaches are (a) hardware support for way partitioning, or (b) operating system support for set partitioning through page coloring. Unfortunately, neither approach by itself is scalable...
Task colocation improves datacenter utilization but introduces resource contention for shared hardware. In this setting, a particular challenge is balancing performance and fairness. We present Cooper, a game-theoretic framework for task colocation that provides fairness while preserving performance. Cooper predicts users' colocation preferences and finds stable matches between them. Its colocations...
In 2013, U. S. data centers accounted for 2.2% of the country's total electricity consumption, a figure that is projected to increase rapidly over the next decade. Many important workloads are interactive, and they demand strict levels of quality-of-service (QoS) to meet user expectations, making it challenging to reduce power consumption due to increasing performance demands. This paper introduces...
Effective Utilization of Resources and throughput computation is an important consideration in using cloud resources. Each resource is allocated by the tasks and each resource has virtual machines to handle the subtasks of use cases. The cost performance analysis is done using the markov model and the Server Allocation Matrix (SAM). Resource allocation in cloud computing System is a new dimension...
Caching on the edge has been recognized as an effective solution to tackle the backhaul constraint of network densification. However, most related works ignored user mobility in wireless networks, which is unreasonable under the background of network densification. For a more flexible and context-aware caching decision, the concept of caching on the edge can be extended to mobile edge computing (MEC)...
HTTP Adaptive Streaming (HAS) protocols have become the de-facto solutions to deliver video over the Internet, mainly due to their ability to limit video freezing and thus enhance consumers' Quality of Experience (QoE). Nevertheless, they do not have the possibility to improve the actual delivered video quality, limited by the available throughput between the delivering server and the chent. Compared...
Fog computing is a promising technology that enables users to perform time-sensitive IoT analytics at locations near the clients. Recent studies have shown the improved delivery performance of fog networks by comparing them with traditional cloud-based architectures. In this paper, we focus on further improving the delivery performance of a fog network. We first show that the performance of fog networks...
Aggregating common-path network flows (in the network interior) helps in improving the applications delivery performance. From the network edge perspective, the sender and receiver-ends of the respective applications need to have a typical one-to-one mapping. An aggregation framework in the network therefore needs an effective forking to maintain the one-to-one mapping of the flows. In this demo,...
Motivated by the increasing trend of storing data for web applications in fast NoSQL systems, in this paper, we experiment with the leading NoSQL datastore — Cassandra — and a latest generation re-design of Cassandra — ScyllaDB — meant to deliver bleeding-edge performance on modern multicore machines. We evaluate the scalability claim of ScyllaDB, in terms of the number of clients, and provide diagnostic...
Network Functions Virtualization (NFV) is a technology for running software-based functions on commodity hardware, which can lead to cost savings and flexible functionality. However, due to the software processing of network functions, the performance of Virtualized Network Functions (VNFs) is considerably degraded in relation to the types of VNFs and the configuration of VNF applications. Therefore,...
A port-Hamiltonian model of the traffic dynamics for a wireless communication system was developed in our previous work. The developed model takes into account various wireless communication aspects: such as a wireless path loss model, the characteristics of a wireless communication system, mac layer and network layer protocols, antenna design, latencies, buffer dynamics, acknowledgment rate and so...
The evolution of the concept of cloud communications has posed a growing emphasis on virtual and abstract environments for the flow of information, structuring it in similitude to a natural cloud. The green symbiotic cloud communications (GSCCs) paradigm created on this concept facilitates the use of multiple communication mediums concomitantly creating a first of its kind communication cloud. This...
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