A network flow is required to be processed by multiple network functions such as PGW and SGW in mobile networks as a service function chain (SFC). Compared to hardware-based network functions, virtualized network functions are more flexible for deployment. Software defined network (SDN) provides a centralized network architecture to manage network resources and route the network flow among network functions in sequence and virtual machines are leveraged to deploy the network functions as network function virtualization (NFV). However, currently the performance of NFV suffers from I/O latency because packet processing causes lots of interrupts that decreases CPU utilization. To address the I/O latency issue, SR-I/OV network card is designed to replace OpenvSwitch in host machines to reduce the system interrupts. However, SR-I/OV is not compatible with existing SDN system, which is an important component in future 5G networks. Therefore, we propose an integrated architecture called the low latency service function chain from a wider perspective in system design to overcome main defects described above. We modify appropriate components in SR-I/OV driver and OpenvSwitch to dramatically reduce packet processing latency in SFC composed by several VNFs. Moreover, our design is compatible with SDN environment and benefited by central control.

网络流需要由多个网络功能（例如，移动网络中的PGW和SGW）作为服务功能链（SFC）处理。与基于硬件的网络功能相比，虚拟化的网络功能更易于部署。软件定义网络（SDN）提供了一种集中式网络体系结构，用于管理网络资源并按顺序在网络功能之间路由网络流，并且利用虚拟机将网络功能部署为网络功能虚拟化（NFV）。但是，当前NFV的性能受到I / O延迟的影响，因为数据包处理会导致大量中断，从而降低CPU利用率。为了解决I / O延迟问题，SR-I / OV网卡旨在替换主机中的OpenvSwitch，以减少系统中断。然而，SR-I / OV与现有的SDN系统不兼容，后者是未来5G网络中的重要组成部分。因此，我们从系统设计的更广阔角度提出了一种称为低延迟服务功能链的集成架构，以克服上述主要缺陷。我们修改了SR-I / OV驱动程序和OpenvSwitch中的适当组件，以显着减少由多个VNF组成的SFC中的数据包处理延迟。此外，我们的设计与SDN环境兼容，并受益于中央控制。我们修改了SR-I / OV驱动程序和OpenvSwitch中的适当组件，以显着减少由多个VNF组成的SFC中的数据包处理延迟。此外，我们的设计与SDN环境兼容，并受益于中央控制。我们修改了SR-I / OV驱动程序和OpenvSwitch中的适当组件，以显着减少由多个VNF组成的SFC中的数据包处理延迟。此外，我们的设计与SDN环境兼容，并受益于中央控制。