Abstract: Now there are few efficient ways to tune the performance of virtual machine, excepts utilizing those general benchmark tools. This paper presents Exentrace, a low level Xen virtual machine performance tuning tools, with two keys features: Lasylog and Smartfilter. It is used to collect and parse data of virtual machines with different workloads. Looking into the data, it successfully resolves a critical performance issue.

Key words: Xen VT-x, Exentrace, Virtual machines

摘要： 目前针对虚拟机环境的性能测试工具很少，测试主要还停留在运行一些基准测试程序的基础上，对虚拟机性能的调优帮助有限。文章提出了一个Xen虚拟机环境下的性能调试工具Exentrace，介绍了其Lasylog和Smartfilter两大特性。演示了利用Exentrace在不同负载的虚拟机上收集、分析数据。利用这些数据发现并解决了一个关键的性能问题。

关键词: Xen VT-x, Exentrace, 虚拟机