Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

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

share|improve this question
add comment

2 Answers

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
add comment

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

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.