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 .. 13. Other Time-Dependent 13. VMI Paravirtual Timer .. 14. Timekeeping in Specific Operating Systems .. 14. Microsoft 14. Linux .. 15. Kernels Before 16. Clocksource 18. Paravirtual Kernels .. 18. 18. Synchronizing Virtual Machines and Hosts with Real Time .. 19. Using VMware Tools Clock Synchronization .. 20. Enabling Periodic Synchronization .. 20. Disabling All Synchronization.
interrupts. In addition, even a running virtual machine can sometimes be late in delivering virtual timer interrupts. The virtual machine checks for pending virtual timer interrupts only at certain points, such as when the underlying hardware receives a physical timer interrupt. Many host operating systems do not provide a way for
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