Research And Optimization Of SR-IOV Virtualization Technology

Through years of development in the field of virtualization, CPU virtualization and memory virtualization have developed to be quite advanced, however, in respect of I/O virtualization, the relatively poor performance of I/O device has affected the performance of virtualization as a whole. Thus currently in the field of virtualization research, experts have been focusing on how to improve I/O virtualization and the efficiency of physical deviceThree kinds of I/O virtualization domain the international stream currently, they are Split I/O, Direct I/O and Passthrough I/O, all of which improve the performance of I/O devices in a degree, and gradually improve I/O devices virtualization performance by hardware support. But, limited by the design of its systematic structure and hardware limitations, the above three I/O virtualization technologies still have a long way to be mature in respect of performance. Among them, Passthrough I/O has the best performance to support client domain to visit I/O devices directly, but it can only allocate a single I/O to one client domain, instead of sharing the I /O devices in multi-client domain. Therefore, Intel brought up the latest SR-IOV technology to settle I/O virtualization, which not only inherits the high performance of Passrthrough I/O virtualization, but also support I/O devices cross-domain share, thus it has a bright future. But as a new technology, SR-IOV lacks itself from two aspects: one is the limited VF quantity; the other is SR-IOV needs special hardware support which limits its application area.By deeply going into the theory and application of SR-IOV virtualization technology, and according to the two limitations of scalability and dependence on hardware support, the paper brought up a scalable VF share model (VFM) and a virtualized SR-IOV model without special hardware support, , and made it realizable in Linux operation system and Xen virtualization monitor. The result shows that the improved SR-IOV virtualization technology has a better performance and scalability.