Publications (2)0 Total impact
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Conference Proceeding: Size-based flow scheduling in a CICQ switch
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ABSTRACT: Size-based (SB) scheduling policies have been shown to improve response times of small flows, without degrading the performance of large flows. But these differentiating policies are designed for Output-queued switch architecture, which is known to have scalability issues. On the other hand, the buffered-crossbar (BX) switch architecture is currently being pursued as a potential next-generation scalable switch architecture. This work looks into the problem of performing SB scheduling in BX switches. In particular, the design goals, w.r.t each output port, are (i) to transmit high-priority packet(s) as long as there is at least one present, and (ii) to respect the FIFO order among high-priority packets. In this direction, we propose to use PIFO queue at each crosspoint of a CICQ switch. The initial design presented as pCICQ-1 switch is simple and guarantees that packet-priorities are respected once they are in the crosspoint queues. But it does not maintain the FIFO order of high-priority packets, besides letting a bounded number low-priority packets to depart through an output, when there are one or more high-priority packets for the same output. To solve this, we propose an enhancement, as pCICQ-2 switch, that achieves both the design goals.High Performance Switching and Routing (HPSR), 2010 International Conference on; 07/2010 -
Conference Proceeding: A virtual switch architecture for hosting virtual networks on the Internet
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ABSTRACT: The future Internet is envisioned to host a large number of virtual networks managed by different operators sharing the same physical infrastructure. In such a scenario, an operator may not even own physical resources as such, but lease virtual resources to have their own virtual networks. While control-plane virtualization with several routing instances becomes common in equipments, the data plane is generally shared relying on logical isolation or resource segmentation, lacking in efficient sharing with performance guarantees. This makes it necessary to look into layer 2, and virtualize the switching fabric to have control over the sharing of the most critical resources for packet switching. In this article, we come up with a flexible architectural design for virtualizing a switching fabric. This new architecture enables a multitude of choices to customize virtual switches as needed. Our simulations show the relative loss in performance brought by virtualization, and demonstrate how the offered flexibility can help in exploiting the resources in a new way, satisfying independent virtual switch requirements.High Performance Switching and Routing (HPSR), 2010 International Conference on; 07/2010
