The VMware document titled "Timekeeping in VMware Virtual Machines" have the following referente to the issues with the time drift:
If the virtual machine is running too slowly, perhaps as a result of competition for CPU time from other virtual machines or processes running on the host machine, it might be impossible to feed the virtual machine enough interrupts to keep up with real time. In current VMware products, if the backlog of interrupts grows beyond 60 seconds, the virtual machine gives up on catching up, simply setting its record of the backlog to zero.
Where is this backlog counter and how can I read it to monitor this behaviour?
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