Yo Rich!
On Thu, 26 Feb 2015 17:01:21 -0500
Rich Schmidt <[email protected]> wrote:
> Gary, this is for USNO Time Service. We are a high-end provider of NTP
> service with over 20 years of satisfying customers! All of my work
> involves improvements to tick and tock and their classified cousins
> in DoD land.
And I've used those servers with good results for almost that long. Kudos
on the USNO performance.
So, what am I doing wrong here?
> > Hmm, no secondary sources? How do you know you do not have the
> > large offset I see?
> >
> I don't know what large offset you are seeing.
> But comparing at the internal NTP level we see no offset from the
> comparison server tick.usno.navy.mil.
Well, at this moment, I am seeing low jitter, but -415 mSec offset to a
PPS receiver on the same host. A long trusted PPS receiver.
> I compared the logged phase offsets from ptp4l and phc2sys using log
> level 6 or 7. In order to do a physical phase measurement I need to
> program the software definable pins on the i210 header to output
> 1PPS, which can then be compared with a time interval counter to the
> USNO Master Clock 1PPS reference. I have yet to modify the igb
> driver to do that, stay tuned.
Very cool.
So, thinking about the differences of our setups...
I suspect, since you are in hard-core metrology, that these machines
are in climate controled rooms and never turned off? Maybe there is
a slow convergence and you are past that?
Have you also been logging your ntpd outputs?
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
[email protected] Tel:+1(541)382-8588
------------------------------------------------------------------------------
Dive into the World of Parallel Programming The Go Parallel Website, sponsored
by Intel and developed in partnership with Slashdot Media, is your hub for all
things parallel software development, from weekly thought leadership blogs to
news, videos, case studies, tutorials and more. Take a look and join the
conversation now. http://goparallel.sourceforge.net/
_______________________________________________
Linuxptp-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
