Transcription of Timekeeping in VMware Virtual Machines
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Timekeeping in VMware Virtual Machines
Timekeeping in VMware Virtual Machines VMware vSphere , Workstation , Fusion INFORMATION GUIDE. Timekeeping in VMware Virtual Machines VMware vSphere , Workstation , Fusion Table of Contents Introduction ..4. Timekeeping Basics ..4. Tick Counting ..4. Tickless 5. Initializing and Correcting Wall-Clock PC Timer Hardware ..6. PIT .. 7. CMOS RTC .. 8. Local APIC Timer .. 8. ACPI 8. TSC .. 8. HPET ..9. VMware Timer Virtualization ..9. Virtual Virtual CMOS RTC .. 10. Virtual Local APIC Timer ..11. Virtual ACPI Timer ..11. Virtual TSC ..11. Pseudoperformance Counters .. 13. Virtual HPET.
In order to achieve these advantages, however, the virtual machine must be alerted that the guest operating system is using tickless timekeeping. The virtual machine must default to tick counting in the absence of knowledge to the contrary, because if the guest operating system is in fact counting timer interrupts, it is incorrect to drop any.
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