Timekeeping in a VMware Virtual Machine.
Timekeeping accurately in a virtual machine is essential for nearly all services in a Virtual Infrastructure. But the PC Timer Hardware weren't designed to keep the time for virtual machines. This gets more complex because different operating systems are using different PC Timer Hardware like PIT and TSC and so on. VMware products use a patent-pending technique to allow the many timer devices in a virtual machine to fall behind real time and catch up as needed, yet remain sufficiently consistent with one another that guest software is not disrupted by anomalous time readings. This presentation will provide information on how virtual machines keep the time and best-practice recommendations about how to configure time synchronization and how to determine if time keeping works accurately.
Application Workloads and System Performance
Technical Deep-dive Session
Thomas Findelkind, VMware
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