Problems with QueryPerformanceCounter on Windows Server 2003 Multi-Processor Hyper-V guests? Heres why.
...TSC. This is a CPU time source that essentially counts CPU cycles. The TSC for each (virtual) processor can be different so there is no guarantee that reading TSC on one processor has anything to do with reading TSC on another processor. This means back to back reads of TSC on different VP's can actually go backwards. Hyper-V guarantees that...



