  We propose Roadside Unit (RSU) Clouds as a novel way to offer non-safety
application with QoS for VANETs. The architecture of RSU Clouds is delineated,
and consists of traditional RSUs and specialized micro-datacenters and virtual
machines (VMs) using Software Defined Networking (SDN). SDN offers the
flexibility to migrate or replicate virtual services and reconfigure the data
forwarding rules dynamically. However, frequent changes to service hosts and
data flows not only result in degradation of services, but are also costly for
service providers. In this paper, we use Mininet to analyze and formally
quantify the reconfiguration overhead. Our unique RSU Cloud Resource Management
(CRM) model jointly minimizes reconfiguration overhead, cost of service
deployment and infrastructure routing delay. To the best of our knowledge, we
are the first to utilize this approach. We compare the performance of purist
approach to our Integer Linear Programming (ILP) model and our innovative
heuristic for the CRM technique and discuss the results. We will show the
benefits of a holistic approach in Cloud Resource Management with SDN.
