Originally published at: https://www.whonix.org/blog/general-information-on-various-clock-sources-such-as-tsc-etc-by-intel
https://software.intel.com/en-us/blogs/2013/06/20/eliminate-the-dreaded-clocksource-is-unstable-message-switch-to-tsc-for-a-stable
(Ignore the highly specific title.)