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.
Timekeeping Basics Computer operating systems typically measure the passage of time in one of two ways: • Tick counting The operating system sets up a hardware device to interrupt periodically at a known rate, such as 100 times
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