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Network virtualization is a promising technology that offers high levels of flexibility, isolation, extensibility and cost-effectiveness. In this paper, the authors focus on router virtualization. They evaluate the forwarding performance of virtual routers when the data plane runs in the guests. This scenario offers a high level of isolation and flexibility, however, it suffers from performance limitations due to the virtualization overhead. They show that the he I/O communication between the driver domain and the guests is the bottleneck. To overcome this limitation, they propose a new packets aggregation mechanism that transfers groups of packets between the driver domain and the guests.
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