关键词: 网络虚拟化，虚拟路由器，缓存共享，轮询方式，用户模式

Abstract: Network virtualization provides the ability to run concurrent virtual networks over a shared substrate. However, it is challenging to design such a platform to host multiple heterogeneous and often highly customized virtual networks. Not only minimal interference among different virtual networks is desired, high-speed packet forwarding is also rectuired. This paper presented Optimized User mode Virtual Router(OUVR) , it is a virtual network platform which uses efficient user mode packet forwarding to supports high-speed and highly customizable virtual networks. With adopting lightweight OS-level virtualization to slice a physical server into virtual machines, the data plane of a virtual muter runs in an isolated virtual machine so as to safe for customization. We designed a new user mode packet processing scheme for virtual routcrs hosted in OUVR to achieve high speed forwarding. Experiments show that an OUVR virtual muter can be four times faster than conventional user mode software muter.

Key words: Network virtualization, Virtual muter, Shared memory, Polling scheme, User mode