Measurements Study on the I/O Performance of Virtualized Cloud System

By splitting up an underutilized physical host into several virtualized domains, Virtualization can make the optimal use of resources and reduce the energy consumption. By delving into the types of I/O applications, adjusting amount of resource, and combining different applications in one or more domains, several insights are observed in this paper: using a few exclusive physical CPU driver domain can improve the efficiency of forwarding, which makes over 17% performance improvement for I/O applications; in addition, the domain providing mixed services can achieve 70% performance gain, when compared with others that provide single service; last but not least, avoiding running too many network-provider domains simultaneously can relieve the inter-domain interference. These observations not only help to bring performance improvement to cloud consumers but also service stability to cloud providers.