3.17 what?
Miroslav Lichvar mlich...@redhat.com wrote:
On Wed, Nov 19, 2014 at 10:09:42AM +, David Taylor wrote:
In bug 2314, I reported that the jitter was always reported as 0 soon after
NTP had started, and this was traced to the Linux in use on the Raspberry Pi
being tickless.
Hi,
I would like to know if NTP can be used to measure latency between
publishers and subscribers in a distributed computing environment. NTP is
configured on all the nodes. How do I use the statistics collected on both
the nodes to measure latency. Is there any tool that I can use for the same?
on a Windows box.
PS: I experimented with falling/rising edge of the 1PPS and now the
difference between NTP and my IRIG board is a few milliseconds.
Jack
I tire of the anti-Windows mantra which sometimes appears in this group,
particularly when it occurs with no consideration for the task in hand
David,
I got this going and everything is working well. However, comparing
NTP time to an IRIG board time with a GPS antenna, I see a difference
of 100ms. Not sure where this came from.
Jack
On Dec 2, 2:29 am, David J Taylor david-tay...@blueyonder.not-this-
bit.nor-this-part.co.uk.invalid
the same
accuracy? When I tried to read time at 60Hz, I found that the times
returned are not periodic, sometimes even the same.
Jack
On Dec 1, 9:28 am, David J Taylor david-tay...@blueyonder.not-this-
bit.nor-this-part.co.uk.invalid wrote:
Dave Baxter g8...@nospam.uko2.co.uk wrote in message
David,
I looked at timeGetTime() and I found it only gives out relative time
(since Windows was started). Is it possible to query NTP server to get
an accurate starting time?
jack
On Dec 1, 1:15 pm, David J Taylor david-tay...@blueyonder.not-this-
bit.nor-this-part.co.uk.invalid wrote:
jack
On Dec 1, 5:11 pm, Dave Hart daveh...@gmail.com wrote:
On Dec 1 16:58 UTC, jack wrote:
I have a related question: given that my system clock is synced to an
external GPS within ms, how do I read time that gives me the same
accuracy? When I tried to read time at 60Hz, I found that the times
0.000 0.000
In ntpd.conf, I have
server 127.127.20.1 minpoll 4 prefer
server 127.127.22.1 minpoll 4
GPS is attached to COM1.
jack
On Nov 30, 11:12 am, Dave Hart daveh...@gmail.com wrote:
On Nov 30, 3:51 pm, jack j.jack.w...@gmail.com wrote:
NTP wouldn't start automatically. The system
time-sensitive data (time
stamped).
I left the device running overnight and I noticed it computed an
offset at one time. It's currently not updating (everything is zero
now). I will read carefully what Dave Hart said and follow his advice.
Thanks to everyone for your help.
Jack
On Nov 27, 1:51 am
out how to switch to kernel mode. I
have
1) serialpps.sys
2) the correspond DLL
3) the environment variable that points to the DLL
I am unclear as to what should be done to switch to kernel mode.
Thanks to all for the help.
Jack
On Nov 27, 9:12 am, jack j.jack.w...@gmail.com wrote:
David,
You
Just to let everyone know that the u-blox GPS works well now. The
offset is 0.02ms with jitter at 0.002ms. My other GPS with only USB
out has an offset of 5ms and jitter of 2.5ms.
Jack
On Nov 27, 11:17 am, David Lord sn...@lordynet.org wrote:
jack wrote:
You assumed right. I did start
David,
Would you mind looking up the model number of the Sitecom serial to
USB converter that has the DCD line? I am very interested in a
solution like that.
Jack
On Nov 27, 2:11 pm, David J Taylor david-tay...@blueyonder.not-this-
bit.nor-this-part.co.uk.invalid wrote:
Just to let everyone
to read all documents available. The GPS I
have is from ublox and it can output 1PPS signal, which I instend to
use later with an RS232 port.
Thanks in advance.
jack
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David,
I read instructions on your web site especially the section on USB GPS
receivers. Version 4.2.4 dated March 15 2009 is the latest on Dave
Hart's website. Why do you get 4.2.5 from?
jack
On Nov 26, 12:20 pm, David J Taylor david-tay...@blueyonder.not-
this-bit.nor-this-part.co.uk.invalid
David,
I switched to a machine with an RS232 port and also found version
4.2.5. NTP now opens port COM1 with no problem. However, status shows
that it doesn't seem to be reading from GPS since all values (jitter,
offset etc) are 0. Any suggestions?
Jack
On Nov 26, 1:15 pm, jack j.jack.w
for about 10
minutes, I saw some values after rebooting the machine but they
disappeared quickly.
Thanks.
jack
ps: I am using the latest NTP from Dave Hart's website. I also
installed serialpps.sys.
On Nov 26, 2:52 pm, David J Taylor david-tay...@blueyonder.not-this-
bit.nor
Monitor was stuck at Please wait.
jack
On Nov 26, 4:30 pm, jack j.jack.w...@gmail.com wrote:
David,
I only have the following in the configure file:
server 127.127.20.1 minpoll 4 prefer
I found the following entry in the log file:
Using user-mode PPS timestamp
Does it mean NTP reads
it through interruption? Polling doesn't sound good
to me. Can somebody point me to some references please?
Thanks to all who participated in this discussion.
Jack
On Mar 10, 6:11 pm, David Woolley
da...@ex.djwhome.demon.co.uk.invalid wrote:
jack wrote:
I cannot switch to Linux because my main
that outputs at a
consistent pace (better if the output can be configured so I only
receive time stamps). Any recommendations wrt that?
Thanks again.
Jack
On Mar 10, 4:59 am, Martin Burnicki martin.burni...@meinberg.de
wrote:
Jack,
jack wrote:
Hi all,
I am trying to sync my Windows box
I cannot switch to Linux because my main application runs only on
Windows. It would take us a long time to port to Linux.
If I can get to millisecond accuracy, I'd be happy.
Jack
On Mar 10, 11:56 am, Dave Hart daveh...@gmail.com wrote:
On Mar 10, 3:44 pm, Richard B. Gilbert rgilber
in the future to go with a system that can take advantage of
the 1PPS signal.
jack
On Mar 10, 2:18 pm, David J Taylor david-tay...@blueyonder.neither-
this-bit.nor-this.co.uk wrote:
Unruh wrote:
[]
The newer x version appears to be a lot more sensitive, at the
expense of somewhat higher
) in terms of
consistencies in its output?
2) what kind of accuracy can i expect?
Thanks to all.
Jack
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