On 12/10/14, 9:45 PM, Mike Cook wrote:
Le 11 déc. 2014 à 05:47, Brian Lloyd <br...@lloyd.aero> a écrit :
On Wed, Dec 10, 2014 at 10:15 PM, Chris Albertson
<albertson.ch...@gmail.com
wrote:
Those sub 1 u-second numbers are very good. They argue for using
the BBB as an NTP server but I wonder if it really is the best.
I think the numbers that matter are measures of the close on the
computers who use your BBB as a server. In other words the goal
is to synchronize a set of computers. Can The little BBB push
accurate time out to a set of user computers and keep then in
sync better then some other NTP server platform?
When I think of what we have been using to run NTP down through the
years, this is almost funny. The BBB is little in physical package
size only. Its processing power is not inconsequential.
The question for anyone using them for other than personal use may be
long term reliability. My three Soekris 4501s all died from power
supply failiurs after 5 years contnuous use, while the 4801s have 6
years under the belt and still going strong. Will the RPIs and BBBs
systematic issues or still be running after the same time? Of course
5 years is not that bad when S1 NTP servers are dedicated to that.
Also the cost is so low that replacement isn’t a problem. A no
brainer really.
Ah, but will the exact same single board computer be available for
replacement in 5 years? Or will it be Rev F instead of Rev B, with
"just a few tweaks to improve performance", but also enough that it's
not "drop the image on it and run"
What about 10 years?
15?
Philosophically it might be a straightforward thing, but it might not be
as easy as one might hope.
Legacy support with processor boards is a real challenge.
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