It gets even more interesting when you put the machine into suspend, and time starts passing without timer interrupts getting serviced. Or when NTP notices tha

It gets even more interesting when you put the machine into suspend, and time starts passing without timer interrupts getting serviced. Or when NTP notices that your local clock is drifting, and attempts to discipline it. As they say on the time-nuts listserv: A man with one clock always knows what time it is. A man with two clocks is never quite sure...