Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

How often does the NTPD service update system clocktime by default?

share|improve this question
up vote 4 down vote accepted

On most systems, including Linux, unless the clock is very off, ntpd doesn't set the clock, it instead varies the length of a second, so that the clock slowly becomes into sync with the master.

This is calling clock skewing, and it's beneficial because it's usually better for a second to be slightly wrong than for seconds to be missed, or even worse, redone.

share|improve this answer
Very well written. Thanks. – Mike B Oct 10 '12 at 21:48

It's also worth noting that if a clock is really off, NTP will refuse to do anything.

share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .