Yo Achim! On Mon, 07 Nov 2016 20:01:46 +0100 Achim Gratz <[email protected]> wrote:
> Gary E. Miller writes:
> > Hard to control the power dissipation on a PC serving the
> > internet.
>
> We weren't talking about a PC, or at least I was not. The only
> subject I'm discussing is a rasPi and more specifically the 2B, which
> has multiple cores to play with.
I consider RasPi's to be PCs, powerfull little machines. I use my
RasPi's exactly as I use my other 'PC's.
> >> 99% of all
> >> PPS timestamps over the last day stay within ±10µs, 75% within ±1µs
> >> and slightly less than half within ±500ns.
> >
> > Odd that I get much better numbers without all that work:
>
> Read again what I wrote, please.
Yeah, I still arrive at tthe same opinion.
> This data was for 86400 raw PPS
> timestamps (which you are seemingly not recording), you are talking
> the loopstats.
Correct. I care about the end result. But when I look attt my raw
data I actually see worse results in the unaveraged data.
> So in fact I do get
> better numbers than yours at least at the tail ends of the
> distribution.
Facts not in evidence. Please post ntpviz graphs and stats. I'm not
gonna go rouund and round with vague assertions instead of data. Here
are many of mine:
https://pi.rellim.com
https://pi2.rellim.com
https://pi3.rellim.com
https://pi4.rellim.com
https://rellim.com
> The skew seems to originate from the aging transient (especially the
> initial part, see below),
Yuu think you are seeing xtal aging in 24 hours? I seriously doubt it
and you'll need a lot longer data collection to prove it. There may
be 'initial' aging just after you cut a crystal, but not it sees
a small transient, what you are seeing is loop convergence. Aging is
by definition irreversible.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
[email protected] Tel:+1 541 382 8588
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