Virtual machine technology enables highly agile system deployments in which components can be cheaply moved, cloned, and allocated controlled hardware resources. In this paper, we examine in the context of multitier Enterprise applications, how these facilities can be used to provide enhanced solutions to the classic problem of ensuring high availability without a loss in performance on a fixed...

The switch design for interconnection networks plays an important role in the overall performance of multiprocessors and computer networks. It is therefore crucial to study various factors in the switch design space and their influence on the system performance. In this paper we first propose a 4-D framework for the design of input queuing switches with wormhole routing and virtual channels. Th...

We consider the telematics appliances, such as firewall, as a basic part of security system with specific preemptive priority queuing and access control algorithm oriented on multi-core implementation. Proposed randomized push-out buffer management mechanism with α parameter allows tuning very efficiently the loss probability of priority packets and the time they spend in queue as the factors u...

This paper analyses a multiple class single server M/M/1/K queue with finite capacity under weighted fair queuing (WFQ) discipline. The Poisson process has been used to model the multiple classes of arrival streams. The service times have exponential distribution. We assume each class is assigned a virtual queue and incoming jobs enter the virtual queue related to their class and served in FIFO...

An immersive whiteboard system is presented where users at multiple locations can communicate with each other. The system features a virtual environment with vivid avatars, stroke compression and streaming technology to effectively deliver stroke data across meeting participants, friendly human interaction and navigation, virtual and physical whiteboard. The whiteboard is both a physical platfo...

Dynamic Multipoint Virtual Private Network “DMVPN” is a solution for the dynamic creation of virtual Private IP tunnels between multiple sites automatically, quickly and with the least configuration. Routing protocols are component technologies' main parts of the DMVPN solution, they ensure the smooth establishment of tunnels and have a major impact on network’s behavior and transported applica...

Differentiated Service Model (DiffServ) is currently a popular research topic as a low-cost method to bring QoS to today’s Internet, especially in the backbone. The DiffServ architecture consists of two key components: traffic conditioning at the edge and Per Hop Behavior (PHB) at the edge and the core. Traffic Conditioners contain various elements such as classifier, meter, marker, shaper and ...

Nowadays, the use of multimedia applications that present QoS requirements is increasing rapidly. Advanced Switching (AS) is a new interconnection network technology that expands the capabilities of PCI Express. AS provides mechanisms that can be used to support QoS. Specifically, an AS fabric permits us to employ virtual channels, egress link scheduling, and an admission control mechanism to d...

This paper presents one of the features of DS (Differentiated Services) architecture, namely the queuing or congestion management. Packets can be placed into separate buffer queues, on the basis of the DS value. Several forwarding policies can be used to favor high priority packets in different ways. The major reason for queuing is that the router must hold the packet in its memory while the ou...

This paper presents and evaluates a quasi-optimal scheduling algorithm for input buffered cell-based switches, named reservation with preemption and acknowledgment (RPA). RPA is based on reservation rounds where the switch input ports indicate their most urgent data transfer needs, possibly overwriting less urgent requests by other input ports, and an acknowledgment round to allow input ports t...