Implement DM-SCAN scheduling in Xen to improve disk I/O performance

• Main Authors: Chen, Ying-Jie, 陳英傑
• Other Authors: Shih, Wei-Kuan
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/55834480431083334465

碩士 === 國立清華大學 === 資訊工程學系 === 102 === Cloud Service changes the traditional service of internet in recent years. Cloud Service Provider provides user with service system to build the service. User does not care what hardware happened in the system, and only cares about the mantenance of service. The reason that cloud service can support user to build service is virtualization technology. It provides cloud service provider to create and manage multiple virtual system in one computer, and each system is isolated in computer. In this techology, Hardware can have the high Utilization in computer and also increase earnings for cloud service provider. Virtualization technology improves the utilization of hardware in computer. However, it also cause the interference for each virtual system because virtual systems share the physical hardware. The interference can reduce the performance of hardware when all virtual system is high loading,ex: disk. To reduce the interference of disk, some researches provides the solution to improve throughput and latency for disk and virtual system. On the other hand, there are also some solution to improve throughput and latency for disk in multimedia systems. To compare with solutions in virtualization technology, some idea are similar for improving the throughput with disk. It also means whether or not solution in multimedia can be used in virtualization technology. In this paper, we implement DM-SCAN scheduling for multimedia in Xen virtualization platform. We compare the throughput and latency with EDF, Deadline, and Flubber. DM-SCAN can improve 5.1% and 15.1% throughput in sequential read and random read which compared with EDF. Therefore, In low deadline setting, DM-SCAN can improve the amount of miss deadline compared with Deadline and Flubber. It means DM-SCAN can be used in Xen and has the better improvement in disk interference.