Papers by Roberto Bruschi
Proceedings of the ACM CoNEXT Student Workshop, CoNEXT 2010, 2010
The largest part of routers and switches, today deployed in production networks, has very limited... more The largest part of routers and switches, today deployed in production networks, has very limited energy saving capabilities, and substantially requires the same amount of energy both when working at full speed or when being idle. In order to dynamically adapt such energy requirements to the real device work load, current approaches foster the introduction of low power idle and
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IEEE Communications Magazine, 2000
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2006 Workshop on High Performance Switching and Routing, 2006
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The expansion of the telecommunication market to a wider number of customers, along with the incr... more The expansion of the telecommunication market to a wider number of customers, along with the increasing of services being offered, has brought the CO2 emissions to a dangerous level. Concern is due both to the impact on the environment and to the high costs caused by such energy consumptions. For these reasons, the scientific community is producing many researches to
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Signals and Communication Technology, 2006
Nowadays, networking equipment is realized by using decentralized architectures that often includ... more Nowadays, networking equipment is realized by using decentralized architectures that often include special-purpose hardware elements. The latter considerably improve the performance on one hand, while on the other they limit the level of flexibility. Indeed, it is very difficult both to have access to details about internal operations and to perform any kind of interventions more complex than a configuration
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Numerous studies have shown that datacenter networks typically see loads of between 5% - 25% but ... more Numerous studies have shown that datacenter networks typically see loads of between 5% - 25% but the energy draw of these networks is equal to operating them at maximum load. In this paper, we propose a novel way to make these networks more energy proportional - that is, the energy draw scales with the network load. We propose the idea of traffic aggregation, in which low traffic from N links is combined together to create H
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IEEE Transactions on Network and Service Management, 2015
ABSTRACT The constant evolution and expansion of the Internet and Internet-related technologies h... more ABSTRACT The constant evolution and expansion of the Internet and Internet-related technologies has exposed the limitations of the current networking infrastructures, which are represented by the unsustainable power consumption and low level of scalability. In fact, these infrastructures are still based on the typical, ossified architecture of the TCP/IP paradigm. In order to cope with the Future Internet requirements, recent contributions envisage an evolution towards more programmable and efficient paradigms. In this respect, this paper describes the basic issues, the technical approaches, and the methodologies for the implementation of power management primitives in the context of the emerging Software Defined Networking. In detail, we propose to extend one of the most prominent solutions aimed at increasing networking flexibility, the OpenFlow Protocol, to integrate the energy-aware capabilities offered by the Green Abstraction Layer (GAL). However, the mere introduction of node-level solutions would be of little or no use in the absence of a network-wide management scheme to guarantee inter-operability and effectiveness of the proposed architecture. In this respect, this work also proposes an analytical model for the management of a network with these capabilities. The results will show how our solutions are well suited to provide a scalable and efficient network architecture able to manage the orchestration and consolidation of the available resources.
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The GreenNet project aims at re-thinking and redesigning different aspects of the current Interne... more The GreenNet project aims at re-thinking and redesigning different aspects of the current Internet technologies and network protocols to smartly support hardware power management. The pursued approach exploits two basic features already and largely present in today's networks and devices: the network resource virtualization and the modular architecture of nodes. These features give the opportunity of decoupling physical elements (e.g., a line-card) from their (virtual) functionalities and resources, so that the latter can be migrated towards other active physical elements. In this way, the emptied physical elements may be put in standby mode, while their logical services may continue to work elsewhere. In this respect, GreenNet aims at investigating a coordinated set of architectural solutions, protocol enhancements, control and optimization strategies, and related software developments in order to support such kind of primitives at both core and access networks.
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2014 IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS), 2014
ABSTRACT The paper investigates the balance between Quality of Service (QoS) and power consumptio... more ABSTRACT The paper investigates the balance between Quality of Service (QoS) and power consumption for a traffic queue. Automatic adaptation to the power of the packet processing engine is sought through a heuristics and an optimal control strategy. The study allows to track the behavior of the system over time, thus avoiding the optimization of the steady state behavior of the system, which is hardly applicable over small time horizons and with high-variable traffics. The algorithms are validated over a very large set of traffic scenarios, buffer size and delay constraints.
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Theoretical Fundamentals, Algorithms and Applications, 2012
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Signals and Communication Technology, 2006
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IEEE Transactions on Network and Service Management, 2014
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2013 IEEE International Conference on Communications (ICC), 2013
ABSTRACT In the last few years, the ever increasing attention to the eco-sustainability of Intern... more ABSTRACT In the last few years, the ever increasing attention to the eco-sustainability of Internet has pointed out the need of providing advanced power management schemes in network devices, in order to be able to reduce energy consumption according to the traffic load. In this context, starting from the observation that most of the traffic of today's Internet is carried by TCP, we focused on the impact that the dynamics of the TCP congestion control may have on energy efficiency of end hosts. In this paper we demonstrate that great energy consumption is related to network congestion conditions. Moreover, we propose to use a technique, called Active Window Management (AWM), with the aim of driving TCP sending rate according to the network available bandwidth, so improving congestion control and providing high TCP performance. AWM requires no changes to any TCP version. We demonstrate that the TCP traffic shaping performed by AWM allows a great reduction of the energy consumption in end hosts, with respect to the case where only TCP is used as congestion control.
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Computer Networks, 2015
ABSTRACT This work proposes a novel approach to reduce the power consumption of IP routers: freez... more ABSTRACT This work proposes a novel approach to reduce the power consumption of IP routers: freezing the forwarding engine of routers line-cards. In fact, recent studies showed that about 60% of the power consumption of a line-card is wasted to lookup the routing table during packet forwarding process. We first define the proposed approach, called Freezing Forwarding Functionality (F3). Then, we provide an ILP formulation of the energy minimization problem under F3 mode and define a heuristic algorithm, referred to as Green Backbone Algorithm (GBA), to solve the problem in large networks. The performance of GBA is evaluated under different traffic scenarios in real ISP network topologies, and a comparison with the ILP solution is carried out for small networks. Results show that :(i) GBA performance, in terms of number of nodes in F3 mode, are very close to optimal ILP solution ones; (ii) a large energy saving (up to 80% of nodes in F3 mode) is obtained in large networks during low traffic hours; (iii) a limited impact on paths length increase is achieved.
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Papers by Roberto Bruschi