Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

disp, offset and delay on ntpq output

Posted on 2011-09-06
3
Medium Priority
?
3,991 Views
Last Modified: 2013-11-17
ok, yes, I'm on 10 things at the same time :-(

here I go:

what is the meaning of disp,offset and delay on ntpq output? It shows differents values..

What is the meaning of a negative value in the offset?

The server is synchronized well. I'm collecting theses 3 data to a chart graph, but I don't understand well the meaning.

Thanks..
0
Comment
Question by:sminfo
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 68

Accepted Solution

by:
woolmilkporc earned 2000 total points
ID: 36488794
delay = time between request and response

offset = difference between reference time and local (system) time
-- should be clear that this value can be negative

disp = dispersion = jitter = variation of time comparisons

All values are in miliseconds.

wmp
0
 

Author Comment

by:sminfo
ID: 36488912
so,

do I have to worry about this negative values? The varuation of this value says something important?
Or I only have to check that ntpd is sync with external servers?

don't fully understand the "disp"

0
 
LVL 68

Assisted Solution

by:woolmilkporc
woolmilkporc earned 2000 total points
ID: 36489098
Negative offset just means that your time is ahead of the reference time,
positive means that you're behind the reference time.

It's quite normal that there is a difference, otherwise there would be no need at all for synchronizing with an external clock source.

dispersion is interesting if there are several timeservers.
It's then a measure of the overall quality of the mix of time servers you selected.  

If these values indicate just a few tenth of a milisecond (except for "delay" of course!) they're more than normal.
Their display can give you a bit insight in how time synchronization works in your specific environment,
but as long as synchronization finally succeeds - why bother?
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

In tuning file systems on the Solaris Operating System, changing some parameters of a file system usually destroys the data on it. For instance, changing the cache segment block size in the volume of a T3 requires that you delete the existing volu…
This tech tip describes how to install the Solaris Operating System from a tape backup that was created using the Solaris flash archive utility. I have used this procedure on the Solaris 8 and 9 OS, and it shoudl also work well on the Solaris 10 rel…
Learn how to get help with Linux/Unix bash shell commands. Use help to read help documents for built in bash shell commands.: Use man to interface with the online reference manuals for shell commands.: Use man to search man pages for unknown command…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
Suggested Courses

618 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question