Hello Sir Unrah,
I just use ntpq -p. I am using Dave Harts rather excellent port to windows:
C:\Program Files\NTP\bin>ntpq -p
remote refid st t when poll
reach delay offset jitter
==============================================================================
*GPS_NMEA(1) .GPS. 0 l 1 16
377 0.000 -0.139 0.059
oPPS(1) .PPS. 0 l -
16 377 0.000 -0.007 0.002
I restarted ntpd a couple of hours ago so these number will improve.
That is a good question, are we talking seconds for offset and jitter here?
Mark
-----Original Message-----
From: unruh [mailto:[email protected]]
Sent: Thursday, 8 December 2011 4:54 PM
To: [email protected]
Subject: Re: [ntp:questions] New ntp Server
On 2011-12-08, Mark C. Stephens <[email protected]> wrote:
> Oh no I am quite happy with my hp3325A ;)
>
>
> Well Okay, after a slight detour trying to get ilo100 to work, I loaded
> centos 6.0 x64 on the DL165 G2 (computer) and found it has 3.3V PCI slots. So
> none of my Serial I/O cards fit, being 5V. I have seen people take a dremel
> to them to cut a 3.3V notch, but I am not a 100% sure this works.
>
> Centos 6.0 is really impressive I have to say. Also the PPS kernel module is
> already built and installed, just need to load it.
>
> So the plan now is to connect a HP58534A GPS Timing Antenna to the only
> serial port and compare the difference.
>
> On a windows box with the same antenna, I get offset of 0.010 and jitter
> 0.001 off the PPS, and ~0.020 offset on the NMEA.
> I think I will try to split the output of the GPS timing antenna into both
> the windows and Linux boxen to compare accuracy on the different O/S's.
Not sure what you mean when you say you get offset of .010 (I assume the units
a ms, not sec) Ie, what are you using to determine the offset?
For nmea and offset of .02 sec is not unreasonable, so maybe you are
>From PPS you should get offsets at the few microsecond level (.000002
sec) on Linux.
>
> I'll let you know how it goes!
>
>
> Mark
>
>
> -----Original Message-----
> From: Rick Jones [mailto:[email protected]]
> Sent: Thursday, 8 December 2011 12:16 PM
> To: [email protected]
> Subject: Re: New ntp Server
>
> unruh <[email protected]> wrote:
>> Nothing except that he wrote down an incomprehensible line of numbers
>> and expected people to know that was a computer, rather than a
>> printer, or an atomic clock.
>
> You were expecting maybe an HP 4972A?-) (10 Mbit/s Ethernet network
> analyzer from *many* years ago) or perhaps an HP P/N 19511-80014?-)
>
> rick jones
> --
> The glass is neither half-empty nor half-full. The glass has a leak.
> The real question is "Can it be patched?"
> these opinions are mine, all mine; HP might not want them anyway... :) feel
> free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
_______________________________________________
questions mailing list
[email protected]
http://lists.ntp.org/listinfo/questions
