Tiziana Ferrari

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A new resource abstraction called Path is introduced in the framework of resource reservation for the optimization of user applications. A network Path is allocated in an on-demand fashion using a number of different signaling methods and is built using a chain of Path Elements that may belong to different administrative domains. Three different(More)
Many Grid architectures have been developed in recent years. These range from the large community Grids such as LHG and EGEE to single site deployments such as Condor. However, these Grid architec-tures have tended to focus on the execution of executables. Application scientists are now seeking to deploy their entire workflows onto these Grids, which will(More)
Current resource r eservation architectures for multimedia networks do not scale well for a large number of ows. We propose a new architecture that automatically aggregates ows on each link in the network. Therefore, the network has no knowledge of individual ows. There is no explicit signalling protocol, and the protocol overhead mainly consists in the(More)
The differentiated services (diffserv) architecture defines a new framework for the support of quality of service (QoS) in IP-based networks. In this paper, we focus on the mechanisms used to implement the Expedited Forwarding (EF) Per-Hop Behavior (PHB). We analyze these mechanisms with respect to two main QoS parameters: Delay and delay variation. Within(More)
The priority queueing mechanism is analysed to verify its effectiveness when applied for the support of Expedited Forwarding-based services in the Differentiated Services environment. An experimental measurement-based methodology is adopted to outline its properties and end-to-end performance when supported in real transmission devices. A test layout has(More)
Computing Grids are hardware and software infrastructures that support secure sharing and concurrent access to distributed services by a large number of competing users from different Virtual Organizations. Concurrency can easily lead to overload and resource shortcomings in large-scale Grid infrastructures, as today's Grids do not offer differentiated(More)
In this article we present the wo rk done to study the potential benefits to end users and network operators and the feasibility of deploying a Less than Best Effort (LBE) service on a wide area scale. LBE is a Per-Domain Behaviour based on the Differentiated Services Quality of Service architecture. We present a brief overview of the evolution of the case(More)