March 2009 Archives

Due to the distributed nature of the pool system we don’t know exactly; but based on some sample measurements we estimate that the overall pool system on average handles somewhere between 40 and 120 thousand NTP requests per second.

If we assume it’s 50,000 a second, that makes a bit over 4300 million requests a day!

In a year that’s about 1500 trillion (american) / billion (other countries) requests a day. (1576800000000, if I’m counting the zeroes right).

That’s a lot of accurate time distributed; and yet triains, planes and meetings run late. :-)

Happy Daylight Saving Time!

In many places around the world March is the month of changing clocks as daylight saving time comes and goes.

Usually a number of users write to tell me that the NTP Pool is an hour off during this time and in the fall when clocks change the other way. Happily it isn’t so; because NTP is based on the almost stable Coordinated Universal Time (aka UTC).

If you use NTP and your clock is an hour off, you either need to update your operating system with the latest patches for the time zone information or you need to check that your time zone is configured correctly and “adjust automatically for daylight saving time” is enabled if that option is provided.

For people in the Northern Hemisphere: Enjoy spring and the increasing daylight!

For those of you on the other side: Sorry, but it’s our turn to have longer days now. :-)