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This paper presents an analysis performance of running multimedia applications on IPv4 compared to IPv6. As acknowledged, today's network faces anexhaustion of IPv4 addresses by Internet Assigned Numbers Authority (IANA) due to larger users need internet communication. Thus, migration from IPv4 to IPv6 is the main reason where some applications should be tested on its running performance on IPv6....
The MPT network layer multipath communication library-which was proposed to be a possible new basis for the future cognitive info-communication-is capable to use multiple communication channels to create an UDP tunnel which uses GRE tunnel protocol. On the other hand, Multipath TCP uses a special kernel module which creates multiple TCP sub-flows to aggregate network throughput. In this paper we used...
In this paper, we study an adaptation method for mobile streaming over HTTP/2. Beside leveraging the server push feature of HTTP/2 to reduce request-related overheads, the proposed method can improve video quality by delivering gradual video bitrate transitions. Experimental results show that our method can provide smooth video quality while resulting in a low number of requests over a whole session.
In cloud computing, multiple servers are consolidated into a physical machine in order to reduce the cost of deploying the servers. Guaranteeing the service level objective (SLO) of each server is one of the most important factors in a virtualization system. Particularly, isolating the I/O resources among VMs competing for a shared storage system is challenging. Recently, use of flash based Solid...
AppScale provides an easy way to distribute applications using the Google App Engine SDK on different infrastructure platforms, e.g. in a private cloud. In this paper, we provide a performance evaluation comparing a benchmark application hosted at the original Google App Engine (GAE) and by means of AppScale at Amazon EC2, at Google Compute Engine (GCE) and on a private on-premise cluster. The benchmark...
To stream video using HTTP, a client device sequentiallyrequests and receives chunks of the video file fromthe server over a TCP connection. It is well-known that TCPperforms poorly in networks with high latency and packet losssuch as wireless networks. On mobile devices, in particular, usinga single TCP connection for video streaming is not efficient, andthus, the user may not receive the highest...
The proliferation of smartphones has unleashed a tremendous growth in wireless traffic, which is projected to continue for the foreseeable future, and put yet greater strain on the capacity of cellular networks. Deployment of pico base stations, reducing cell sizes and allowing more efficient reuse of limited radio spectrum, provides a powerful approach to cope with traffic hot spots and bring capacity...
A NoC-based system subject to real-time constraints requires hard bounds on end-to-end data transfer latencies. Regulating the channel injection rates solves the problem by suppressing link congestion and router queue saturation, provided that the channel rates guarantee fairness in the data distribution. We propose a distributed algorithm for the computation of a channel rate vector solution, suitable...
All the cores of a many-core chip cannot be active at the same time, due to reasons like low CPU utilization in server systems and limited power budget in dark silicon era. These free cores (referred to as bubbles) can be placed near active cores for heat dissipation so that the active cores can run at a higher frequency level, boosting the performance of active cores and applications. Budgeting inactive...
Following the explosion of Internet-enabled mobile devices and mobile services, users tend to expect network connectivity everywhere they go and at any time. In anticipation of these higher connectivity expectations and requirements especially for vehicular communication, several technologies like WiMAX, cellular networks (i.e., 3G/4G) and wireless mesh networks have been developed. While cellular...
In this work we report the final results of the field demonstration of the European FP7 mPlane project concerning the evaluation of the network performance with particular details regarding the access Quality of Service and traffic monitoring. We show how the proposed and experimented architecture of this measurement plane is fundamental for many future internet evolutions concerning user perception,...
A performance measure which is often used when evaluating systems modeled by Petri nets is the throughput of a transition in steady-state, i.e., the number of firings per unit time in permanent regime if it exists. When fluid Petri nets are considered, such measure corresponds to the continuous flow of the transitions. Its value depends on the firing rates associated to transitions and also on the...
OpenFlow is currently the most commonly deployed Software Defined Network (SDN) technology. Some deployments designed with multi-controller OpenFlow have better scalability than standard OpenFlow. However, these deployments are not optimized for the Data Center Network (DCN), the cross-controller communication and routing may be inefficient. In this paper, we present the communication mechanism design...
This study addresses the problem of joint optimization of both inventory and production processes for stochastic customer orders in the dynamic setting. Customer orders arrive at the inventory department dynamically, and each order contains multiple product types with random workloads. Necessary materials need to be drawn from inventory and later be utilized in the production department. A customer...
Parallel file systems are important infrastructures for both cloud and high performance computing. The performance of metadata operations is critical to achieve high scalability in parallel file systems. Nevertheless, traditional parallel file systems are lack of scalable metadata service. To alleviate these problems, some previous research distributes metadata to separated large-scale clusters and...
A Virtual Private Network (VPN) is a technology that is used to securely connect private network passing through a public network such as the Internet. Using a VPN, a computer, tablet, or smartphone is able to securely connect with others in the Internet as if they were part of a private network. Using this technology may also bring security threats like spoofing, snipping, and hacking as the data...
TCP-based application-layer protocols are increasingly applied to commercial live video streaming systems. However, in unstable mobile networks, the throughput of TCP may fluctuate rapidly due to its transmission mechanism, causing undesired playback interruption. In this paper, we propose a general application-layer rate adaptation approach to cope with the variability in TCP throughput. We analyze...
In this work, we focus on designing high-throughput anycast mechanisms in a software Defined Network (SDN), as anycast routing serves as a fundamental building block for many services. Specifically, we investigate two main challenges for efficient implementation of a SDN-based anycast system: high throughput anycast routing (HTAR) and congestion-free anycast reconfiguration (CFAR). For the first challenge,...
State machine replication (SMR) is a well-known technique that guarantees strong consistency (i.e., linearizability) to online services. In SMR, client commands are executed in the same order on all server replicas: after executing each command, every replica reaches the same state. However, SMR lacks scalability: every replica executes all commands, so adding servers does not increase the maximum...
We address the problem of analyzing the mean delay experienced by end-users in a Content Distribution Network (CDN) consisting of a set of surrogate (cache) servers connected via persistent TCP connections over the Internet cloud to a set of remotely located origin servers. We first consider the simplest scenario of a single cache server and a single origin server. Taking into account several factors...
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