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Linux Tips and Tricks

Correcting Linux Clock on a Virtualized System

We have had issues on some of our VMs under RHEV. Setting up NTP won’t help as the time always gets off. To correct the time, modify the kernel boot options as below then reboot the machine for changes to take effect.

For x64 systems: divider=10 clocksource=acpi_pm
For x86 systems: notsc divider=10

See complete parameters including Windows VMs here.

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