David Lord wrote:
Below are values for offset and jitter from polls at
30 min intervals.
BR-304 gps18x-lvc gps18x-lvc
rmcrmcrmc+pps
polls offset polls offset polls offset
% n (ms) % n (ms)
Unruh wrote:
David Lord sn...@lordynet.org writes:
David Lord wrote:
Below are values for offset and jitter from polls at
30 min intervals.
BR-304 gps18x-lvc gps18x-lvc
rmcrmcrmc+pps
polls offset polls offset
David Lord sn...@lordynet.org writes:
David Lord wrote:
Below are values for offset and jitter from polls at
30 min intervals.
BR-304 gps18x-lvc gps18x-lvc
rmcrmcrmc+pps
polls offset polls offset polls
I have a SiRF star III based USB dongle (US GlobalSat BU-353)/plug
that I got a location off of in a basement room about 6 feet from the
window. currently it's attached to box whos' ntpd crashes every time
I
mention it. I think it's talking in the binary mode and the kernel
device
is tuck at the
James Browning wrote:
On Sep 17, 10:52 pm, David J Taylor david-tay...@blueyonder.not-
this-part.nor-this.co.uk.invalid wrote:
Don't worry about trees - a modern GPS such as the GPS 18x LVC is very
sensitive, and can work with a lot of obscuration. Although my GPS 18 LVC
is sitting on the
Unruh wrote:
David Lord sn...@lordynet.org writes:
James Browning wrote:
On Sep 17, 10:52 pm, David J Taylor david-tay...@blueyonder.not-
this-part.nor-this.co.uk.invalid wrote:
Don't worry about trees - a modern GPS such as the GPS 18x LVC is very
sensitive, and can work with a lot of
On Sep 17, 10:52 pm, David J Taylor david-tay...@blueyonder.not-
this-part.nor-this.co.uk.invalid wrote:
Don't worry about trees - a modern GPS such as the GPS 18x LVC is very
sensitive, and can work with a lot of obscuration. Although my GPS 18 LVC
is sitting on the roof, the GPS 18x LVC
David Lord sn...@lordynet.org wrote in message
news:7hg1jtf2s1lv...@mid.individual.net...
David J Taylor wrote:
You'll have to get a GPS puck and wireless PC on the roof! Safely
That looked a possibility earlier this year but treeline front
and back has shot up maybe a couple of metres
David J Taylor wrote:
David Lord sn...@lordynet.org wrote in message
news:7hg1jtf2s1lv...@mid.individual.net...
David J Taylor wrote:
You'll have to get a GPS puck and wireless PC on the roof! Safely
That looked a possibility earlier this year but treeline front
and back has shot up
David Lord wrote in message
news:7hh1ihf2smeu...@mid.individual.net...
[]
It's very wet round here with 90 +/- 10% R/H being common in
various locations including out back of house which is often
95%. You could only hang washing out for it to get wet. This
means leaves are soaking wet and
David Lord sn...@lordynet.org writes:
David J Taylor wrote:
David Lord sn...@lordynet.org wrote in message
news:7hg1jtf2s1lv...@mid.individual.net...
David J Taylor wrote:
You'll have to get a GPS puck and wireless PC on the roof! Safely
That looked a possibility earlier this year but
David Lord wrote in message
news:7hd884f2t62h...@mid.individual.net...
[]
That's good enough for me. The usb connection rules out
PPS mode and seems to limit to +/-10ms.
cheers
David
Why rule out PPS? I tried a GPS/PPS signal over USB and found a jitter of
about 45 microseconds:
David J Taylor wrote:
David Lord wrote in message news:7hd884f2t62h...@mid.individual.net...
[]
That's good enough for me. The usb connection rules out
PPS mode and seems to limit to +/-10ms.
cheers
David
Why rule out PPS? I tried a GPS/PPS signal over USB and found a jitter
of
David Lord wrote in message
news:7hee7pf2s1jo...@mid.individual.net...
[]
What I've not tried so far over usb or direct to serial
port, is pps on DCD with type 22 driver and radioclkd2
using signal on a different pin CTS, DSR or possibly RNG.
There are a couple of problems with that, the
On 2009-09-17, Unruh unruh-s...@physics.ubc.ca wrote:
Steve Kostecke koste...@ntp.org writes:
The NTP Stable release needs to poll a refclock 4 times before it
collects enough data to adjust (i.e. step or slew) the clock. The times
you quote are consistant with this.
A refclock usually has a
David J Taylor wrote:
.
It does sound as if you are enjoying yourself, in any case!
yes, now at endgame when it's all fitting together but not the
pain getting there. Living inside an LF wavetrap (steel joists
earth strapped to copper central heating pipes I'm guessing
= several big
David Lord wrote in message
news:7hevfhf2sksi...@mid.individual.net...
[]
yes, now at endgame when it's all fitting together but not the
pain getting there. Living inside an LF wavetrap (steel joists
earth strapped to copper central heating pipes I'm guessing
= several big shorted loops)
David J Taylor wrote:
You'll have to get a GPS puck and wireless PC on the roof! Safely
That looked a possibility earlier this year but treeline front
and back has shot up maybe a couple of metres already and if
same next year I'd be needing a mast.
hidden in some cupboard up there. Or
David Lord sn...@lordynet.org writes:
David J Taylor wrote:
You'll have to get a GPS puck and wireless PC on the roof! Safely
That looked a possibility earlier this year but treeline front
and back has shot up maybe a couple of metres already and if
same next year I'd be needing a mast.
I
Unruh wrote:
I believe the delays are asymmetric in large part due to vastly
different data rates from the earth to the ship (high rate) vs from
the ship (low rate).
No idea why that would make it assymetric. Light does not travel at a
different velocity simply because it is a crowd of other
Unruh wrote:
IIRC, the round trip time approaches 40 min when they are
farthest apart? With the worst case velocity difference
approaching 121K mph (54KmpS)? Thats approaching 65km
difference in distance between when a message is sent,
and the response is sent?
So what? The signal goes
Steve Kostecke wrote:
On 2009-09-15, David Lord sn...@lordynet.org wrote:
Meanwhile I'll see if ntpd will step from refclock source as
It will.
It does, sort of :-(
On NetBSD-5.0.1 with radioclkd2 + shm and Conrad module tuned
to MSF connected via serial-usb converter, from four attempts
Unruh wrote:
IIRC, the round trip time approaches 40 min when they are
farthest apart? With the worst case velocity difference
approaching 121K mph (54KmpS)? Thats approaching 65km
difference in distance between when a message is sent,
and the response is sent?
So what? The signal goes
Unruh wrote:
Terje Mathisen wrote:
IMHO, this is simply wrong.
Well, your humble opinion in this case does not accord with the way the
world works.
Mea Culpa!
You are absolutely right: Mars does stand still, so as long as (t3-t2)
is short, both times will be more or less identical. :-)
David Lord wrote:
Steve Kostecke wrote:
On 2009-09-15, David Lord sn...@lordynet.org wrote:
Meanwhile I'll see if ntpd will step from refclock source as
It will.
It does, sort of :-(
On NetBSD-5.0.1 with radioclkd2 + shm and Conrad module tuned
to MSF connected via serial-usb
On 2009-09-16, David Lord sn...@lordynet.org wrote:
Tonight I gave it another couple or tries with ntpd -q
reset +0.150s within 300s
then used date to give a bigger initial offset
reset +66.9s within 330s
then started ntpd and was in sync within 260s
The NTP Stable release needs to poll a
Terje,
Funny you should ask. Interplanetary timekeeping is covered in Chapters
17 and 18 in the second edition of das Buch. However, one of the first
things to learn in space is that where you are is much more important
than what time it is.
To compare clocks on the Earth and Mars surfaces
Steve Kostecke koste...@ntp.org writes:
On 2009-09-16, David Lord sn...@lordynet.org wrote:
Tonight I gave it another couple or tries with ntpd -q
reset +0.150s within 300s
then used date to give a bigger initial offset
reset +66.9s within 330s
then started ntpd and was in sync within 260s
David Lord sn...@lordynet.org writes:
Unruh wrote:
Steve Kostecke koste...@ntp.org writes:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Steve Kostecke wrote:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Frank Elsner wrote:
OT you also have rather a lot of sources
E-Mail Sent to this address will be added to the BlackLists
n...@blacklist.anitech-systems.invalid writes:
Unruh wrote:
BlackLists writes:
David Lord wrote:
Can you then suggest how it's at all possible for ntpd
to be of any use on a mobile connection with such high
latency?
Unruh wrote:
Steve Kostecke koste...@ntp.org writes:
On 2009-09-14, Frank Elsner els...@tubit.tu-berlin.de wrote:
The relevant lines read:
server times.tubit.tu-berlin.de minpoll 6 maxpoll 8
server ntps1-0.cs.tu-berlin.deminpoll 6 maxpoll 8
server ntps1-1.cs.tu-berlin.de
David Lord wrote:
Frank Elsner wrote:
Steve Kostecke wrote:
[ ... ]
Do you have a driftfile line?
Yes, this one:
116.833
?
I'll guess that's content of your drift file rather than
location specified in ntp.conf.
ntp.conf: driftfile /var/lib/ntp/drift
Unruh wrote:
David Lord sn...@lordynet.org writes:
Unruh wrote:
Steve Kostecke koste...@ntp.org writes:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Steve Kostecke wrote:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Frank Elsner wrote:
OT you also have rather a lot of
IF the latency is known to be symmetric ( which it is
on an interplanetary system) then large latency is no
problem.
I don't see how they are likely to have symmetric latency.
e.g.
The earths orbital velocity is something like 67k mph?
mars orbital velocity is something like 54k mph?
Frank Elsner wrote:
David Lord wrote:
Frank Elsner wrote:
Steve Kostecke wrote:
[ ... ]
Do you have a driftfile line?
Yes, this one:
116.833
?
I'll guess that's content of your drift file rather than
location specified in ntp.conf.
ntp.conf:
David Lord wrote:
Frank Elsner wrote:
David Lord wrote:
Frank Elsner wrote:
Steve Kostecke wrote:
[ ... ]
Do you have a driftfile line?
Yes, this one:
116.833
?
I'll guess that's content of your drift file rather than
location specified in ntp.conf.
ntp.conf:
David Lord wrote in message
news:7h961mf2rgla...@mid.individual.net...
[]
Having said that I don't have the need for millisecond
accuracies when there's no network but have had one
major disaster when running a cleanup script and clock
had at some time been badly off so masses of the wrong
Frank Elsner wrote in message news:7h9c1lf2sgcf...@mid.dfncis.de...
[]
I wonder where this useing a vm comes from. Your not the first :-)
--Frank Elsner
Romain Kang mentioned it on Sep 09.
David
___
questions mailing list
Frank Elsner wrote:
David Lord wrote:
Frank Elsner wrote:
David Lord wrote:
Frank Elsner wrote:
Steve Kostecke wrote:
[ ... ]
Do you have a driftfile line?
Yes, this one:
116.833
?
I'll guess that's content of your drift file rather than
location specified in
Frank Elsner els...@tubit.tu-berlin.de writes:
him sooner from whatever destroyed his time. Note that he is running a vm
and the time on
^^
Hä? Source for this please :-)
It's a Fedora box, running 24/7.
Sorry, must
David Lord sn...@lordynet.org writes:
Unruh wrote:
David Lord sn...@lordynet.org writes:
Unruh wrote:
Steve Kostecke koste...@ntp.org writes:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Steve Kostecke wrote:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Frank Elsner
Unruh wrote:
BlackLists writes:
Unruh wrote:
BlackLists writes:
David Lord wrote:
Can you then suggest how it's at all possible for ntpd
to be of any use on a mobile connection with such high
latency?
Interplanetary Timekeeping ?
http://www.cis.udel.edu/~mills/ipin.html
IF the latency
Bill Unruh writes:
Obviously ubuntu decided that since both do the same thing and would
be in conflict if both were running at the same time, they will not
allow both to be installed.
It's my fault (assuming Ubuntu uses my Debian package). I made my
Chrony package conflict with Ntp because
On Sep 14, 9:33 pm, Unruh wrote:
IF the latency is known to be symmetric ( which it is on an
interplanetary system) then large latency is no problem. If it is not
known to be symmetric and worse, both in and out latencies are variable,
then it is pretty well impossible.
I believe the delays
Unruh wrote:
David Lord sn...@lordynet.org writes:
...
On Ubuntu it's made more difficult than it needs be as
both default to running from startup. I've been trying
to get radioclocks to work so need ntpd installed for
those. Anyway I'll try getting chrony installed
standalone.
Dave Hart daveh...@gmail.com writes:
On Sep 14, 9:33=A0pm, Unruh wrote:
IF the latency is known to be symmetric ( which it is on an
interplanetary system) then large latency is no problem. If it is not
known to be symmetric and worse, both in and out latencies are variable,
then it is pretty
Hmm. It's interesting that the value is almost exactly 1/10th the
value in the thread. But it doesn't seem to be that a single rogue
return from gettimeofday could have caused this. The system clock does
end up 434 seconds behind, relative to the server, so it doesn't seem
like a transient
Steve Kostecke wrote:
On 2009-09-14, Frank Elsner els...@tubit.tu-berlin.de wrote:
The relevant lines read:
server times.tubit.tu-berlin.de minpoll 6 maxpoll 8
server ntps1-0.cs.tu-berlin.deminpoll 6 maxpoll 8
server ntps1-1.cs.tu-berlin.deminpoll 6 maxpoll 8
server
On 2009-09-14, Frank Elsner els...@tubit.tu-berlin.de wrote:
The relevant lines read:
server times.tubit.tu-berlin.de minpoll 6 maxpoll 8
server ntps1-0.cs.tu-berlin.deminpoll 6 maxpoll 8
server ntps1-1.cs.tu-berlin.deminpoll 6 maxpoll 8
server zeit.fu-berlin.de
Frank Elsner wrote:
Steve Kostecke wrote:
On 2009-09-14, Frank Elsner els...@tubit.tu-berlin.de wrote:
The relevant lines read:
server times.tubit.tu-berlin.de minpoll 6 maxpoll 8
server ntps1-0.cs.tu-berlin.deminpoll 6 maxpoll 8
server ntps1-1.cs.tu-berlin.deminpoll
Steve Kostecke koste...@ntp.org writes:
On 2009-09-14, Frank Elsner els...@tubit.tu-berlin.de wrote:
The relevant lines read:
server times.tubit.tu-berlin.de minpoll 6 maxpoll 8
server ntps1-0.cs.tu-berlin.deminpoll 6 maxpoll 8
server ntps1-1.cs.tu-berlin.deminpoll 6
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Frank Elsner wrote:
OT you also have rather a lot of sources specified and if just for a
single box it seems a bit excessive and could be trimmed to four or
five (I'd also guess some of those eight get same refid).
Red Herring.
I've just
On 2009-09-14, Unruh unruh-s...@physics.ubc.ca wrote:
Steve Kostecke koste...@ntp.org writes:
Why are you changing the minpoll / maxpoll ?
Please try again without the minpoll / maxpoll modifiers.
That has absolutely nothing to do with his problem. In fact having a
smaller maxpoll saved him
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Steve Kostecke wrote:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Frank Elsner wrote:
OT you also have rather a lot of sources specified and if just for a
single box it seems a bit excessive and could be trimmed to four or
five
David Lord wrote:
Can you then suggest how it's at all possible for ntpd
to be of any use on a mobile connection with such high
latency?
Interplanetary Timekeeping ?
http://www.cis.udel.edu/~mills/ipin.html
--
E-Mail Sent to this address blackl...@anitech-systems.com
will be added to
David Lord wrote:
Steve Kostecke wrote:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Frank Elsner wrote:
OT you also have rather a lot of sources specified and if just for a
single box it seems a bit excessive and could be trimmed to four or
five (I'd also guess some of those eight
E-Mail Sent to this address will be added to the BlackLists
n...@blacklist.anitech-systems.invalid writes:
David Lord wrote:
Can you then suggest how it's at all possible for ntpd
to be of any use on a mobile connection with such high
latency?
Interplanetary Timekeeping ?
Steve Kostecke wrote:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Steve Kostecke wrote:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Frank Elsner wrote:
OT you also have rather a lot of sources specified and if just for a
single box it seems a bit excessive and could be
Unruh wrote:
Steve Kostecke koste...@ntp.org writes:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Steve Kostecke wrote:
On 2009-09-14, David Lord sn...@lordynet.org wrote:
Frank Elsner wrote:
OT you also have rather a lot of sources specified and if just for a
single box it
David writes:
Chrony gave a quicker convergence but doesn't seem to have equivalent
to 'ntpd -q' and I'm converging from many seconds and even with the
chrony equivalent of burst it takes too long compared to using 'ntpd
-q' to set time reasonably close.
Use the chronyc makestep command to
John Hasler wrote:
David writes:
Chrony gave a quicker convergence but doesn't seem to have equivalent
to 'ntpd -q' and I'm converging from many seconds and even with the
chrony equivalent of burst it takes too long compared to using 'ntpd
-q' to set time reasonably close.
Use the chronyc
Unruh wrote:
BlackLists writes:
David Lord wrote:
Can you then suggest how it's at all possible for ntpd
to be of any use on a mobile connection with such high
latency?
Interplanetary Timekeeping ?
http://www.cis.udel.edu/~mills/ipin.html
IF the latency is known to be symmetric ( which
Hello *,
strange happening yesterday. See this logfile lines:
Sep 10 20:45:52 seymour ntpd[9104]: synchronized to 192.53.103.108, stratum 1
Sep 10 20:58:07 seymour ntpd[9104]: synchronized to 134.34.3.18, stratum 1
Sep 10 21:21:02 seymour dovecot: dovecot: Fatal: Time just moved backwards by
Frank Elsner wrote:
Hello *,
strange happening yesterday. See this logfile lines:
Sep 10 20:45:52 seymour ntpd[9104]: synchronized to 192.53.103.108,
stratum 1
Sep 10 20:58:07 seymour ntpd[9104]: synchronized to 134.34.3.18, stratum 1
Sep 10 21:21:02 seymour dovecot: dovecot: Fatal:
On 2009-09-11, Frank Elsner els...@tubit.tu-berlin.de wrote:
strange happening yesterday. See this logfile lines:
Is this a VM?
Sep 10 20:45:52 seymour ntpd[9104]: synchronized to 192.53.103.108, stratum 1
Sep 10 20:58:07 seymour ntpd[9104]: synchronized to 134.34.3.18, stratum 1
Sep 10
Frank,
The message
Sep 10 21:21:02 seymour dovecot: dovecot: Fatal: Time just moved backwards by
434 seconds. [ ... ]
Is not in the software distribution from here. Apparently, your version of ntpd
has been modified. Even so, the probably cause is a defective server your
protostats file
Is not in the software distribution from here. Apparently, your version
of ntpd has been modified.
David -
Dovecot is the same application I use to POP3 mail from my SMTP gateway to
my portal. All it is doing is squawking about the problem because it
remembers what time it was the last time
67 matches
Mail list logo
