Re: [ARMini-support] Is it possible to get the correct time
- From: Barry Smith <baz@xxxxxxxxxxx>
- To: armini-support@xxxxxxxxxxxxx
- Date: Mon, 23 Mar 2015 16:14:38 GMT
In message <54a8e73d0djcgl@xxxxxxxxxxxxxxx>
Jim Lesurf <jcgl@xxxxxxxxxxxxxxx> wrote:
snip
> Just FWIW and AIUI.
> The method changes the clock rate (regulation) to have it run 'slow' if the
> clock is ahead, or 'fast' if its behind. If nothing else was then done
> later, this would mean it eventually overshoots and runs away. But you also
> choose to have system re-regulate at user-specified intervals. The amount
> by which the rate is regulated fast or slow is, I think, meant ot be
> affected by how much in advance or behind the clock may be. That then means
> that as the process is repeated the clock error *should* tend to get
> smaller and the regulation 'nudges' smaller.
> That should mean that an 'always on' system slowly glides toward having a
> small time error and a modest rate correction.
> The problem is that this may not work for various reasons, some of which
> are obscure. If you're going to test this, also note the times when the
> machine is switched on or off.
At the moment I'm running it (ARMiniX) 24/7 and running
*nettime_status (from time to time) in a task window which I can save.
Once I have sufficient data I will upload the results to my website.
Initially it was 20 seconds slow. It's now within 1 second (when I
compare it with my PC which runs ntp).
It will be interesting to see how much "drift" occurs after a shutdown
period.
Barry
--
www.g4iat.co.uk Using an ARMiniX with RISC OS 5.21 SP7b (21-Apr-14)
http://www.g4iat.co.uk/wx/noaa/
http://www.wunderground.com/weatherstation/WXDailyHistory.asp?ID=IENGLAND203
http://app.weathercloud.net/map/
---
To alter your preferences or leave the group,
visit //www.freelists.org/list/armini-support
List-related queries to info@xxxxxxxxxxxx
Other related posts:
