Improving Guest Operating System Accounting for Descheduled Virtual Machines in ESX Server 3.x Systems

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August 23, 2006

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This document explains how to install and monitor VMDesched on Linux and Windows guest operating systems. It also describes timer interrupt virtualization issues resolved by VMDesched and how VMDesched works.When installed, the VMDesched component provides two key benefits: Improved accuracy for guest operating system CPU time accounting when physical CPU resources are overcommitted. Improved guest operating system timekeeping with respect to real time. The experimental VMware Descheduled Time Accounting component, VMDesched, is an optional new component of VMware Tools. VMDesched is available starting with ESX Server 3.0.