A CPU provision scheme considering virtual machine scheduling delays in Xen virtualized environment

Managing hardware resources efficiently when they are shared in virtualized environment is a critical issue for improving application QoS. For CPU resources, virtual machine scheduling delays should be additionally concerned, because they cause unexpected service delays to guest applications and can consequently violate the application QoS. There have been many researches to manage CPU resources by monitoring resource utilization and analyzing application performance via mathematical techniques such as queuing models. However, most of the studies cannot always guarantee the application QoS, because they do not reflect the virtual machine scheduling delay. In this paper, we propose a CPU provision scheme considering virtual machine scheduling delays in Xen environment. We compare the performance of the proposed scheme with that of Sandpiper and show that the proposed scheme decreases the number of SLA violations.