Dynamic time slice of credit scheduler

This paper analyzes the factors affecting the response time of I/O in VCPU with CPU-intensive workload based on Credit scheduler, and presents a new dynamic time slice mechanism in Credit Scheduler of Xen VMM. This scheduler can improve the I/O response time of VCPU having intensive I/O and CPU workloads. Especially when the workload of PCPU becomes heavy, the proposed new mechanism can stabilize the average and maximum response time of I/O in VCPU with mix workload. Experimental evaluation shows that the dynamic time slice has better I/O response time with little overhead, proving the improvement of Credit scheduler.