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LACS: latency-aware credit scheduler to improve responsiveness

This paper exposes the original Xen credit scheduler. In some case, the original credit scheduler results in low responsiveness. The credit scheduler is a proportional fair share central processing unit (CPU) scheduler and provides CPU fairness. However, in contrast with fine CPU fairness, the responsiveness is insufficient in the case of CPU intensive workloads. We modify the Xen credit scheduler to obtain an improved response time because VM scheduling significantly affects the responsiveness of virtual machines (VMs) in virtualization environments. The supposed scheduling boosts a VM with a conditional boost mechanism to maintain CPU fairness. The experimental results show that the supposed scheduling technique offers better responsiveness for a VM than the original credit scheduler.