There are various clock-sources available in Linux. It is important to select the right one for keeping a correct system clock, or to reduce time drifts and keep the system time in sync with a time source. Which clock-source you choose can affect performance too.
A good starting point is to determine which clocksources are available on your system and which one is currently in use.
cd /sys/devices/system/clocksource/clocksource0/
cat available_clocksource
cat current_clocksource
Excellent brief primer on various clocks: http://the-b.org/Linux_timers
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