These simply indicate that as you noticed, the Windows port currently
does not include the SHM driver. However, the ?code in refclock_shm.c
once was portable to Windows, and probably can be made so again without
too much effort. You'll need to edit ports\winnt\include\config.h to
#define
Nazim,
If all you need is relative timing, pick a computer as master (a modern
one one you rarely reboot is a good choice), edit the ntp.conf file to
use a series (say 3) of external pool servers. then goto the other 3
machines, edit the ntp.conf file and point them at you master, NOT the
pool
pkmaybe you can post your ntp.conf file, so we can take a look.
-Original Message-
From: questions-bounces+p.kennedy=fugro.com...@lists.ntp.org
[mailto:questions-bounces+p.kennedy=fugro.com...@lists.ntp.org] On
Behalf Of E-Mail Sent to this address will be added to the BlackLists
Sent:
Hi Will,
good questions. Before I offer an answer:
1. can you please provide samples of the ntp.conf files you have in
place. It would really assist.
2. can you please provide the version of ntpd you are using?
regards
pk
Questions:
How can I configure a client/peer to always accept a
Exactly so. you can purchase a GPS receiver for well under $100 connect
it to a serial port + pps on any of the pc's and have microsecond
accuracy in a few hours. This 'master' can then serve time to all other
PC's. The systems will then behave for years of unattended use. It is
a far more
I suspect Dave is on the money here. I commonly see this with RS232
data from a multitude of GNSS receivers. GNSS hardware primary purpose
is typically to compute position. We are leveraging off the very handy
clock stability feature inherent of GNSS. It is not uncommon for
firmware developers
Hi Ali,
when you state ' do not synchronize their times with the server', what
do you mean?
if you run 'ntpq -p' on the client side, you should see something like
this
remote refid st t when poll reach delay offset
jitter
Hi Ralph,
NTP is designed to synch your PC clock to UTC. If it is doing its job
correctly, your PC clock time == utc time, so any software displaying
time will do the trick.
If you would like to get hold of NTP's best estimate of time, I would
recommend the ntpq qc tool.
ntpq -c rv
which
Ivan,
That tool would be ntpd.
Just add all the servers you want to monitor, restart ntp and then run ntpq -p
to see them all lined up.
You can log the data to peerstats files to a file and make long term plots.
Regards
- Original Message -
From:
Hi Dave,
good feedback.
I have had the pi running for several days now without a hitch. Due to
my dynamic IP (pending a static ip), you can find the pi and associated
ntp server at:
http://secondthoughts.no-ip.org
I made a small realtime time-series plot and a page displaying ntpq info
so I can
I had a think about this oddball question last night, and decided to
explore it a little further.
Assuming I understand the original question from Harry Bloomfield, it
came to me that the we already have the data Harry is looking for in the
peerstats files, ie we have a data record for each
Prab,
this is a very ambiguous question, so I shall answer it as briefly as
the question demands.
PPS requires specific hardware and wiring. No PPS does not.
regards
pk
-Original Message-
From: questions-bounces+p.kennedy=fugro.com...@lists.ntp.org
Ben,
you have not yet stated what OS you are using. I think we need to know
the flavour of windows you are using. If I read the mail thread, I see
you have the following issues...
1. You have a problem with startup being too slow to achieve acceptable
synchronisation.
2. Your windows boxes
Forgive me if I am wrong, but this is a very odd request. As far as I
can tell, the request is for the NTP corrections to the system clock to
be used to correct a different clock.
I cannot quite understand how this is of practical use. It is like
diagnosing the faults on your car engine and
...@lists.ntp.org] On
Behalf Of unruh
Sent: Wednesday, 17 October 2012 5:34 PM
To: questions@lists.ntp.org
Subject: Re: [ntp:questions] Using ntpd with custom clock
On 2012-10-17, Rob nom...@example.com wrote:
Kennedy, Paul p.kenn...@fugro.com.au wrote:
Forgive me if I am wrong, but this is a very odd
Pedro,
Unruh makes some good points here. Here is a good start point ntp.conf
to get the stats logged at each server...
#@Pedro, this section will log some ASCII stats of the clock quality.
# You can easily plot them in scipy or your tool of choice. This is
your 'baseline' for quality
Dave,
ntpd will be in /usr/bin or /usr/sbin. On my pi the /usr/sbin is the
one in use. Just copy across your newly built binary and restart with a
sudo /etc/init.d/ntp restart
you can always kill the ntpd process (with a sudo ps -e | grep ntpd
followed by sudo kill -9 processname), then run
Oct 29 18:45:21 2012
Subject: Re: [ntp:questions] Using Trimble TSIP under Linux
On 29/10/2012 09:44, Kennedy, Paul wrote:
Dave,
ntpd will be in /usr/bin or /usr/sbin. On my pi the /usr/sbin is the
one in use. Just copy across your newly built binary and restart with a
sudo /etc/init.d/ntp
Dave,
I believe the answer to your question is 12.5 minutes.
This is the time it takes to receive the full set of 25 almanac frames,
which contains the GPSTime/UTC offset (amongst other things).
http://en.wikipedia.org/wiki/GPS_signals#Almanac
regards
pk
That is one description. Another would be it is a fully functional
linux computer with LAN, HDMI, SVideo, Audio, USB, Serial, and a GPIO
bus with the footprint of a credit card, no moving parts which draws
only 2-3 watts for US$35.
My pi units run various processes such as NTP, web hosting and
-Original Message-
From: questions-bounces+p.kennedy=fugro.com...@lists.ntp.org
[mailto:questions-bounces+p.kennedy=fugro.com...@lists.ntp.org] On
Behalf Of David Taylor
Sent: Friday, 28 December 2012 2:33 PM
To: questions@lists.ntp.org
Subject: Re: [ntp:questions] Using PPS
On 28/12/2012
Yep. My bad.
Definitely the GPIO port.
Pk
On 28/12/2012, at 5:45 PM, David Taylor
david-tay...@blueyonder.co.uk.invalid wrote:
On 28/12/2012 06:53, Kennedy, Paul wrote:
[]
I use the type 20 driver on my pi, and PPS to the GPIO boards works a
treat with an $RMC or $ZDA string
I split the gps+pps (20) into gps and pps (20 22) and that solved the problem.
I do wish I knew what happened.
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I have four GPS receivers into four different computers. I've assumed that I
should be able to get small offsets between them but to do so I need
to set time1. If that's the correct approach how do I pick the right
system to be the benchmark. So far I've just been assuming that
the purpose
On Saturday, May 25, 2013 1:06:48 AM UTC-4, unruh wrote:
GPS receivers are not particularly good time sources UNLESS you use PPS.
All of my clocks use PPS and in fact none of them use GPS to number the seconds
except the one that uses refid GPS. That clock is a purpose built
NTP-equivalent
On Saturday, May 25, 2013 3:05:13 AM UTC-4, David Taylor wrote:
What happens with the fudge set to zero?
Please show the table for each machine.
Showing 192.168.0.2 and .244 with time1 = 0 as compared to the first post where
time1 was ~100 microsec.
These two have gigabit interfaces. 0.2 is
On Sunday, May 26, 2013 5:25:28 PM UTC-4, unruh wrote:
Lan will have delays of the order of .15ms (worse for gigabit)
This not the delay reported by ntpq. Is it wrong or are you talking about
another measurement?
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On Thursday, June 20, 2013 5:51:50 PM UTC-4, E-Mail Sent to this address will
be added to the BlackLists wrote:
enable stats [etc. etc.]
As noted earlier I've done that or it's not applicable. E.g. I only use the
PPS driver and my seconds are numbered by an appliance that doesn't run
On Friday, June 21, 2013 9:16:28 PM UTC-4, Charles Elliott wrote:
You may be making a mistake using stratum 1 servers
All the S1 servers are on my local network. I (temporarily) have six.
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On Friday, January 3, 2014 5:54:45 AM UTC-5, Ralph Aichinger wrote:
Or would you not bother at all, and just put some puck into
the window (which probably works too)?
I'd put a timing antenna in the attic (used Symmetricom 58532A/VIC100s, which
I have, are cheap). I have one near the ceiling
(I inadvertently sent this only to Terje Mathisen)
On Sun, Mar 23, 2014 at 12:07 AM, Danny Mayer wrote:
What do you mean by load-balancing? NTP cannot be load-balanced.
Of course it can (at some cost).
On Sun, Mar 23, 2014 at 3:43 AM, Terje Mathisen wrote:
You really do NOT want
Hi, I'm setting up ntp on an isolated net.
Some of our linux machines run a custom time protocol that synchronizes the
kernel to GPS time to sub millisecond accuracy.
I've got my ntpd.conf using the local oscillator (127.127.1.1) clock at stratum
1.
I'm looking to see what I should do when my
On Friday, June 17, 2022 at 9:37:15 AM UTC-4, chris wrote:
> The problem is the monitoring software
What software product/program do you mean?
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On Friday, June 17, 2022 at 11:24:31 AM UTC-4, chris wrote:
> It's the code that polls ntp servers to verify that they are up.
Where is it in this tarball:
http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.8p15.tar.gz
If it's not there then you're probably in the wrong list/group.
On Friday, June 17, 2022 at 2:24:05 PM UTC-4, chris wrote:
> That's correct, but the various issues with the system have been
> discussed for years, yet nothing ever gets done about it. That's the
> point that Philip above was making...
Of course working with Harlan is difficult. Coming here
On Friday, June 17, 2022 at 2:12:52 PM UTC-4, chris wrote:
> Nothing to do with products. ntp.org has a monitoring system that polls
> every server in its database to verify that it's reachable.
Perhaps you mean pool.ntp.org. It's in the ntp.org namespace but it's a
separate project run by Ask
On Friday, June 17, 2022 at 2:33:35 PM UTC-4, David Woolley wrote:
> On 17/06/2022 19:14, Paul G wrote:
> > Where is it in this
> > tarball:http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.8p15.tar.gz
> >
> >
> > If it's not there then you're
Figure I might chime in with the gps unit I got and if your in Aust i
think its probably about the best deals i've seen that has a pps line
(theres also another one they have if you can do smd soldering thats
cheaper again).
Hi All,
I've got a SiRF star 3 GPS with a PPS line which im trying to get
running on a machine with ubuntu 12.10 and a serial port using the DCD
line for pps signalling. Took quite a while as the ntpd that ships with
ubuntu 12.10 appears to be compiled without pps support (please correct
me
watching it, when it adjusts
the system time it seems to impact the jitter calculation quite
considerably and with the other ntp servers in there, it doesnt always
seem to want to choose the gps as the absolute truth.
On 07/04/13 23:46, David Taylor wrote:
On 07/04/2013 11:14, Paul J R wrote:
Hi
many references to anyone using an Atheros chipset for pps
and ntp so far but im curious if anyone else has had any experiences?
Regards, Paul
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On 8/09/2015 5:44 pm, Gabs Ricalde wrote:
On Tue, Sep 1, 2015 at 3:22 AM, Paul J R <m...@pjr.cc> wrote:
Hi All,
Thought I might share my experiences. Got given a little AR9331 based router
some months ago (gl.inet 6416a) and spun up pps on one of its gpio lines.
Its been running for a
The answer is no and yes (and also maybe)..
no because the current pps-gpio driver only loads a single pin (though
it could be extended to load more than one, but i dont think anyones
done that).
yes because the other way it could be achieved is to create a second
module called pps-gpio2
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