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)
Grid workload management and scheduling enable the efficient distribution of tasks in Grid systems and allow their transparent execution by hiding the complexity of the Grid infrastructure at the fabric layer. We propose an approach to workload management and scheduling that aims at optimizing resource utilization (some optimization criteria are discussed).(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 provisioning of end-to-end services in presence of traffic aggregation is evaluated in the framework of the Differentiated Services QoS architecture. The effect of stream multiplexing on delay and jitter-sensitive traffic is analyzed through an experimental approach. Aggregation is evaluated in three different scenarios: with different aggregate traffic(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)