May 20, 2017

The Actual Cost of Software Switching for NFV Chaining

  • Caggiani Luizelli M.
  • Raz D.
  • Saar Y.
  • Yallouz J.

Network Function Virtualization (NFV) is a novel paradigm allowing flexible and scalable implementation of network services on cloud infrastructure. An important enabler for the NFV paradigm is software switching, which needs to satisfy rigid network requirements such as high throughput and low latency. Despite recent research activities in the field of NFV, not much attention was given to understanding the costs of software switching in NFV deployments. Existing approaches for traffic steering and orchestration of virtual network functions either neglect the cost of software switching or assume that it can be provided as an input, and therefore real NFV deployments of network services is often suboptimal. In this work, we conduct an extensive and in-depth evaluation of the impact of service chaining deployments on Open vSwitch -- the de facto standard software switch for cloud environments. We provide insights on network performance metrics such as latency, throughput, CPU utilization and packet processing, when considering different placement strategies of a service chain. We then use these insights to provide an abstract generalized cost function that accurately captures the CPU cost for network switching in deployed service chains, which is an essential building block for any practical optimization placement strategy for NFV service chaining.

Recent Publications

April 12, 2017

From Scaling Disparities to Integrated Parallelism: A Decathlon for a Decade

  • Neilson D.
  • Winzer P.

Based on a variety of long-term network traffic data across different geographies and applications as well as long-term scaling trends of key information and communication technologies, we identify fundamental scaling disparities between technologies used to generate and process data and technologies used to transport data. These disparities could lead to ...

April 12, 2017

An 8 x 10-Gb/s, 42-km High-Split TWDM PON Featuring Distributed Raman Amplification and a Remotely Powered Intelligent Splitter

  • Earnshaw M.
  • Gnauck A.
  • Hehmann J.
  • Iannone P.
  • Jentsch L.
  • Pfeiffer T.
  • Straub M.

We demonstrate an intelligent symmetric-rate, 8 x 10- Gb/s, bi-directional time and wavelength-division multiplexed passive optical network (TWDM-PON) with 42-km reach, and 1:256 split. 1425-nm laser pump light provides distributed Raman amplification for the upstream channels (allowing lowcost low-power transmitters), serves as a low-rate telemetry channel, and powers an intelligent ...

March 27, 2017

Dielectric powder loaded coaxial-cavity filters

  • Bulja S.
  • Doumanis E.
  • Pivit F.

In this paper we demonstrate the use of low-loss powders in the design and fabrication of RF filters. Initially, several different powders are tested for their RF performance - in particular their relative dielectric permittivity and loss tangent. Then, based on the information obtained in this way, the best performance ...