[ntp:questions] how to have offset < 1ms

Rob nomail at example.com
Tue Apr 13 18:46:35 UTC 2010


unruh <unruh at wormhole.physics.ubc.ca> wrote:
> Of course. That is the thing about solutions. You provide extra
> information or hardware that is needed to impliment the solution. Now if
> you have a better one, I am sure he would welcome it. But I have not
> seen it. 

In his position, I would investigate the cause of the delay.  There
may be something going wrong that affects other network operations as
well.  This needs to be debugged, and suddenly NTP and the other applications
will work better.

I certainly would not suggest adding hardware and input to the system
that is not in the specification.  As I wrote before, he wants to sync
to a specified source.  The source may be off from GPS, but that is what
he wants to sync to, not GPS.  And I already gave a very good reason for
that.

When I add a system to our LAN I want to sync to the local NTP reference,
not to something else.  The NTP reference is synced to a DCF radio clock
and outside sources, but that is not important.  What is important is
that all systems keep the same time.

Also, you always ignore the issue that a GPS receiver will not work
without an antenna position with sky view.  This is often not available.
(which actually is why we use a DCF receiver, not a GPS).

Don't think that your favourite solution to your own problem is everyone's
solution to every problem.




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