Heiko Gerstung wrote:
[]
> It could be helpful to see the output of "ntpq -p" and "ntpq -c rv
> " where is the association ID of one of the remote servers.
> This id can be found out using "ntpq -c as" .. and yes, the event log
> would be helpful as well.
>
> Best Regards,
> Heiko
Heiko, many t
Folks,
I'm looking for suggestions here. For the last day, I've been trying on
and off to help someone get the Meinberg installation of NTP working. It
appears to install correctly, and the service starts, but ntpq -p shows
all remote servers in INIT with a reach of zero. No connectivity, it
droodle wrote:
[]
> thanks David - i just found that very tool doing some research so
> thanks for recommending it i shall do some testing ... do you know if
> it can be configured just to syncronise to its cmos clock as i'm not
> sure how tied down my customers network will be ie not internet
> fa
droodle wrote:
> Hi,
>
> I have an reporting tool that i need to syncronise between several
> servers.
>
> I want to make the central reporting tool the primary time server
>
> then there will be several remote servers that i want to syncronise
> the time with so they are all in sync
>
> can this b
Unruh wrote:
[]
> Curnow had an intrest at one time in porting to windows, but his
> interest
> or time to keep up chrony is low now so it will have to be done by
> others.
OK, Bill, sorry to hear it may take some time.
Cheers,
David
___
questions ma
Are there any algorithm of other differences which might cause noticeable
performance differences between 4.2.4 and 4.2.5? For example:
- 4.2.5 being more reluctant to increasing the polling interval from 64s
(with a mixture of local stratum-1 and Internet pool servers)?
- 4.2.5 showing an inc
David Woolley wrote:
> David J Taylor wrote:
>
>>
>> Is there a parameter I can tune from the ntp.conf which would reduce
>> the offset, at the expense of increased jitter? Perhaps I'm asking
>> for the impossible?
>>
>
> Reducing minpoll will help,
David J Taylor wrote:
> You can now call the program with a list of ntp nodes to check on the
> command line:
Further update, I've added a command-line only version for fully automated
operation.
http://www.satsignal.eu/software/net.htm#NTPLeapTrace
On my own system, the followin
Towli wrote:
> Hi all
> I am trying to understand the numbers below from a "show ntp
> associations" on a cisco switch.
[]
> why the difference in numbers? and what does the numbers "when",
> "poll" , "delay" "offset" and "disp" mean? ?
[]
> I am sorry if i am a little naive in asking you this, and
Augustine wrote:
> On Mar 25, 2:30 pm, "David J Taylor" this-bit.nor-this.co.uk> wrote:
>>
>> ntp1.arse.org
>
> I'm not surprised about this one... :-D
>
> Jokes aside, why do we still see such announcements months after the
> event? What can be
I have a system using NMEA and PPS, from which I'm getting microseconds of
jitter but hundreds of microseconds of offset. OK, perhaps the crystal is
cheap, and the room temperature is definitely not stabilised! This is
with ntp 4.2.4p6, and a 16 second minpoll for the refclock (and minpoll
10
You can now call the program with a list of ntp nodes to check on the
command line:
http://www.satsignal.eu/software/net.htm#NTPLeapTrace
On my own system, the following nodes are incorrectly showing a
leap-second for April 1st:
ntp1.arse.org
dns0.rmplc.co.uk
calx.pulsewidth.org.uk
I think
Steve Kostecke wrote:
> On 2009-03-25, David J Taylor wrote:
>
>> I sent a message to the WebMaster on 19 March 2009 at 09:26 and it
>> seems to be in a state:
>>
>> "has been placed on hold, waiting for a human moderator to examine
>> it and take app
I sent a message to the WebMaster on 19 March 2009 at 09:26 and it seems
to be in a state:
"has been placed on hold, waiting for a human moderator to examine it
and take appropriate action"
I've heard nothing since then. Is this normal?
Thanks,
David
__
Towli wrote:
[]
> I was unclear. The signal is poor, due to a lot of distortion from the
> surroundings i bellieve...
> We are <1000 km from Frankfurt so the signal itself is supposed to be
> ok (with a clear view south).
>
>
> /T
Distortion? Do you perhaps mean large amounts of radio frequency
Steve Kostecke wrote:
[]
> The list of project ideas is linked from
> http://support.ntp.org/bin/view/Dev/GoogleSummerOfCode
Thanks, Steve.
David
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Harlan Stenn wrote:
> I'm pleased to announce that the NTP Forum has been selected to
> participate in the 2009 Google Summer of Code, on behalf of the NTP
> Project.
>
> If you know any students who would like to work on a Google Summer of
> Code project (hopefully on an NTP-related idea) please h
Danny Mayer wrote:
[]
> Just build the NTP simulator that comes with the NTP sources. There
> are config options you need to build this.
>
> Danny
Danny,
As you mat recall, I have tried building NTP from the sources with your
help, and failed. I may be able to look at this again when a new sour
alkope...@googlemail.com wrote:
> Hi
> My setup is as follows:
>
> Server A <--- GPS
> |
> |
> Server B <--- HP cesium frequency normal
>
>
> Server A gets it's timestamps from GPS.
> Server B gets it's timestamps from Server A and PPS from the HP
> cesium. Server A is marked as prefer because
Simple leap-second checker available
Folks, I wanted to know which of the servers I was synching to was sending
out those pesky incorrect leap-second announcements, so I wrote a simple
program to automate the steps I had been requested to follow: You can
download the program here.
http://w
Steve Kostecke wrote:
[]
> Your graphs suffer from legibility problems due to limitations
> inherent in the current version of MTRG.
The graphs display the data as accurately as the programming interface
provides it, to the nearest degree C.
> "The idea behind this is that it is more efficient
Uwe Klein wrote:
[]
> Does this help?
> http://support.euro.dell.com/support/edocs/systems/Op745/en/UG_en/trouble.htm
> Look for "Air temperature" further down.
>
> looks like (nearly) all Dell Boxes have an ambient air temp sensor.
>
> The question will prob. be how to get at the data programmatic
Steve Kostecke wrote:
[]
> How about http://oss.oetiker.ch/mrtg/doc/mrtg-rrd.en.html ?
Steve,
That's most helpful, thanks very much. However, it includes the
show-stopper statement that: "mrtg will not create any webpages of graphs
anymore". Unfortunately, I rely on those Web pages and PNG gr
Augustine wrote:
> On Mar 20, 4:24 am, "David J Taylor" this-bit.nor-this.co.uk> wrote:
>>
>> It's a Dell 4400, and not
>> supported by quite a few of the graphic temperature monitor
>> software, so probably not a "standard" chip. I don'
Steve Kostecke wrote:
> On 2009-03-20, David J Taylor wrote:
>
>> Unruh wrote:
>>
>>> Unfortunately the scale on the graph is a bit useless (the variation
>>> is squeezed up far too much).
>>
>> Yes, and no. It's MRTG, so it's going to plo
Unruh wrote:
> "David J Taylor"
[]
>> I put the temperature graph next to the timekeeping graph here:
>
>> http://www.satsignal.eu/mrtg/performance_feenix.php
>
>> but I think that ambient temperature would be much more useful than
>> HDD temperature.
&g
Uwe Klein wrote:
[]
> How many temperatures does your motherboards BIOS/Healthmonitor
> screen show?
> Quite often there are three:
> CPU,
> ~Northbridge,
> "somewhere ambient"
>
> last straw would be to wire a LM75 I2C TempSensor
> or similar to the MB SM-Bus ( most have an unused connector.
>
> u
David J Taylor wrote:
[]
> Yes,
>
> I've been searching for a utility which can do what I need, and
> graphical programs or no problem, but for MRTG I need something with
> text output to StdOut. Either disk temperature or CPU temperature
> would be fine, just a program w
Steve Kostecke wrote:
[]
> A good writer, who is considerate of his readers, will take the time
> necessary to edit the quoted material in an article (as I have done in
> this case) to focus on the salient material.
>
> http://www.netmeister.org/news/learn2quote.html
Agreed. To me, it makes much
Rob Neal wrote:
[various examples]
Rob,
You are finding that there are strong-minded individuals in this
newsgroup, and that while some of their opinions are quite valid, others
are out-of-date, and now incorrect. Dig deeper and you may discover the
history of why they hold those views.
I
Rob wrote:
[]
> I wanted to describe the general situation seen on this group, not
> really the particular responses that you gave. There were several
> replies that suggested to first install different software.
Probably best to start a new topic, then.
Cheers,
David
__
Rob wrote:
[]
> What I want to state is: somebody has a Windows domain and is asking
> how
> he can check if its time is similar to some external ntp server.
> Windows provides the w32tm command with the /monitor flag that
> accomplishes exactly that. The user did not ask how he could get
> better
Dave Hart wrote:
[]
> Tiny Ben is a simple program. [1] NTPmonitor is a bit less simple.
> Tiny Ben meets superscientist who's into shaving seconds and
> cloning :)
[]
> [1] http://www.satsignal.eu/software/disk.html#TinyBen
[]
> Cheers,
> Dave Hart
Tiny Ben is a simple analog clock program. It
Rob wrote:
[]
> When somebody asks a question about a Windows system, where a native
> NTP implementation is available that can be debugged with a simple
> commandline program (w32tm), the response to any question invariably
> is to "install ntpd".
>
> It may have some advantages, but is it really
Dave Hart wrote:
[]
> I updated the satsignal.eu NTPplotter beta when I still could not find
> _*.png files being saved by the Save button. There's a new knob to
> control the period over which the jitter running average is
> calculated, which most likely means the average jitter line isn't
> dire
Dave Hart wrote:
> In David J Taylor's specific case, on reflection, the CPU temp might
> be a close enough proxy. David runs that machine with a near-constant
> CPU load (around 20% I believe) so the CPU heat output should be
> pretty steady and the major influence on core temp would presumably b
Richard B. Gilbert wrote:
> Towli wrote:
>> Thank you!
>> It seems that ntpd is a Unix-thing though. Does something similar
>> exist to xp?
>>
>
>
> Ntpd runs under Unix, Linux, OpenVMS, Windows/XP (and possibly other
> versions (W/2K and V/Vista are the likeliest suspects)) and possibly
> operati
Towli wrote:
> Hi
>
> I would like to test my internal clock (from my domain pc) against a
> public ntp server, to see if there is a discrepance (i suspect our
> domain time is not synchronised properly).
> Is there a way to do this?
>
> Bst rgds from Denmark
> /T
I wrote a simple program to do
Dave Hart wrote:
[]
> The 150us offsets are while slewing to try to catch up with the 3ppm
> frequency shift as the heat comes on. I have to imagine a Windows PC
> with a more stable oscillator (lower temperature coefficient to
> frequency) would do better, though I'm not deluding myself that it
>
Unruh wrote:
> "David J Taylor"
[]
>> Another PC in the same room running a FreeBSD system has about half
>> the jitter, but far less offset - PC Pixie at the top:
>
>> http://www.satsignal.eu/mrtg/performance_ntp.php
>
> That looks much more like the
Unruh wrote:
[]
> Maybe when someone finally put refclock support into chrony you will
> have
> your wish.
Not until it runs under Windows.
> It sounds like your temp changes causing rate changes on a
> scale
> that ntp cannot properly cope with. (ntp is terrible at coping with
> changes-- a purp
Dave Hart wrote:
> On Mar 17, 5:25 pm, "David J Taylor" this-bit.nor-this.co.uk> wrote:
>>
>> The program which Dave used to produce his graphs from loopstats
>> data is available in an unsupported beta version here:
>>
>> http://www.satsigna
Unruh wrote:
[]
> Gads, those offsets are huge. And 3PPM variation is also pretty big.
Dell 4400 hardware sitting in a non-temperature controlled environment -
warm in the day, cold at night. I would happily accept five times the
jitter for a fifth of the offset!
Cheers,
David
__
Dave Hart wrote:
> Unusually for me, the configuration and code on my reference clock
> test machine has been static for the last two days UTC. I've posted
> loopstats and graphs for that period on http;//davehart.net/ntp/
> refclock/
[]
> Cheers,
> Dave Hart
The program which Dave used to produc
paul.cro...@softwareag.com wrote:
> Joseph,
>
> If you're not willing to get the source code for NTP and compile it,
> you can download a binary from http://www.sunfreeware.com/.
> It's probably configured with a 'standard' set of
> refclock drivers and, as a consequence, may be larger
> than a cus
Steve Kostecke wrote:
> On 2009-03-13, David J Taylor wrote:
>
>> Steve Kostecke wrote:
>>
>>> On 2009-03-13, David J Taylor wrote:
>>>
>>>> Can that documentation be updated?
>>>
>>> doc.ntp.org is an archive of the docu
Steve Kostecke wrote:
> On 2009-03-12, David J Taylor wrote:
>
>> I tend to use Google, which for "ntpq" brings up:
>>
>> http://www.cis.udel.edu/~mills/ntp/html/ntpq.html
>
> The documentation at that URL tracks the development version of NTP
> and m
Steve Kostecke wrote:
> On 2009-03-13, Steve Kostecke wrote:
>
>> On 2009-03-13, David J Taylor wrote:
>>
>>> it would be helpful if the most recent version were the first hit
>>> returned.
>>
>> The best I can do right now is to make the ho
Steve Kostecke wrote:
> On 2009-03-13, David J Taylor wrote:
[]
>> it would be helpful if the most recent version were the first hit
>> returned.
>
> I have no idea if that's possible with ht://dig.
>
> The best I can do right now is to make the home page search
David Woolley wrote:
> David J Taylor wrote:
>
>> i.e. server B and C have a space rather than any other character. Those
>> servers are fine, but they are both actually syncing from
>> server A. Space appears to be defined as:
>>
>> "The peer is disca
Dave Hart wrote:
[]
>> The only table I can find on the official site is:
>>
>> http://www.cis.udel.edu/~mills/ntp/html/decode.html
>>
>> where the description is: "discarded as not valid (TEST10-TEST13)"
>
> Does it also have a more detailed description of TEST12?
Yes: "peer synchronization loop
Dave Hart wrote:
> On Mar 11, 6:28 pm, "David J Taylor" this-bit.nor-this.co.uk> wrote:
>> Folks,
>>
>> I'm seeing an ntpq -p display like:
>>
>> * server-A 377
>> server-B 377
>> server-C 377
>>
>> i.e. server B and C h
Dave Hart wrote:
> On Mar 12, 8:12 pm, "David J Taylor" this-bit.nor-this.co.uk> wrote:
>> Dave Hart wrote:
>>> It looks like you've found a documentation omission.
>>
>> Thanks, Dave. As you have the code to hand, could you report it as a
&g
Martin Burnicki wrote:
> David J Taylor wrote:
>> David J Taylor wrote:
>> []
>>> On the Intel 6600 dual-core, 2.4GHz processor here, under XP, a
>>> RDTSC takes about 4.2ns, and a OS call to timeGetTime takes about
>>> 11.8ns. At least, they do if my me
Folks,
I'm seeing an ntpq -p display like:
* server-A 377
server-B 377
server-C 377
i.e. server B and C have a space rather than any other character. Those
servers are fine, but they are both actually syncing from server A. Space
appears to be defined as:
"The peer is discarded as
Richard B. Gilbert wrote:
> David J Taylor wrote:
>> David Woolley wrote:
>> []
>>> You won't get millisecond accuracy on Windows. Although the
>>> software clock can be disciplined to better than a millisecond,
>>> applications can only read to one
David J Taylor wrote:
[]
> On the Intel 6600 dual-core, 2.4GHz processor here, under XP, a RDTSC
> takes about 4.2ns, and a OS call to timeGetTime takes about 11.8ns.
> At least, they do if my measurement program is working correctly
>
> Haven't checked QPC.
>
Terje Mathisen" <"terje.mathisen at tmsw.no wrote:
> Martin Burnicki wrote:
>> Here, 2 consequent QPC calls retrun a difference of ...
>> 350..400 ns using TSCs on an Intel 3 GHz CPU
>
> That's horrible!
>
> Since the RDTSC takes less than 10 ns on that cpu, the remaining
> 340-390 ns is lost in th
Martin Burnicki wrote:
[]
> The problem can be avoided if I force the system to use the PM timer
> for QPC, using the /usepmtimer flag in the Windows boot.ini as
> suggested in http://support.microsoft.com/kb/833721/en-us
>
[]
> On the following page there is an overview which timer is used by
> wh
David Woolley wrote:
> David J Taylor wrote:
>> David Woolley wrote:
>> []
>
>>
>> David, do you have a reference for your "risks lost ticks" statement
>> as applied to Windows?
>
> Windows has been mentioned on this newsgroup as losing ticks
David Woolley wrote:
[]
> You won't get millisecond accuracy on Windows. Although the software
> clock can be disciplined to better than a millisecond, applications
> can only read to one tick, which is 10ms by default and 1ms with the
> fastest multi-media timers (which risks lost ticks).
David,
Unruh wrote:
[]
>> The newer "x" version appears to be a lot more sensitive, at the
>> expense of somewhat higher current consumption. You can tell the
>> LVC version what sentences to send. Better check the technical spec
>> to see what the USB one can be told to do:
>> http://www.garmin.com/ma
jack wrote:
> Hi everyone,
>
> First of all, I thank you for all your response.
>
> I understand the best solution would be using an IRIG board and that's
> what we had been using. We are now trying to make our product more
> compact by using a small single board PC with no RS 232 or PCI slot
> (no
Maarten Wiltink wrote:
> "David J Taylor"
> wrote in
> message news:jzqtl.5203$lc7.2...@text.news.virginmedia.com...
>> Martin Burnicki wrote:
> [...]
>>> We did't ever have any problems using the DNS servers of our ISPs.
>>
>> At the time, m
Danny Mayer wrote:
> David J Taylor wrote:
[]
>> Martin,
>>
>> When I was involved in this, some years ago now, each site had its
>> own DNS servers, and those spoke to a central company-wide DNS
>> server. The connection to the ISP was central, and not per-site
Martin Burnicki wrote:
> David J Taylor wrote:
>> Martin Burnicki wrote:
>>> However, if several local subnets needed to resolve "microsoft.com"
>>> then each one would have to ask the root servers the first time.
>>
>> Wouldn't you have one
Martin Burnicki wrote:
> David,
>
> David J Taylor wrote:
>> Richard B. Gilbert wrote:
>> []
>>> I've been using Comcast for five or six years now without a problem!
>>> YMMV.
>>
>> There have been a few problems with my ISP, hence I move
Danny Mayer wrote:
> Dave Hart wrote:
[]
> He didn't even mention Windows, why would you expect him to be using
> Windows utilities? As far as I can tell you have made no patches
> available against 4.2.4p6 and they don't belong there anyway. They
> should be in the ntp-dev branch.
>
> Danny
I, fo
Danny Mayer wrote:
[]
> Why would the account even be in the adminstrators group? It shouldn't
> even be in the users group since that also has too many privileges.
It could be there because you have put it there during testing a new
version, to allow change of priority. It's a lot quicker to do
regan_russ...@hotmail.com wrote:
[]
> My code (and project) works, I learnt a lot (a real lot believe me)
> and I have to start on clean up, an installer and documentation, maybe
> tomorrow.
[]
> Regan
Regan,
You might want to look at InnoSetup, in case you don't already know it.
Cheers,
David
Danny Mayer wrote:
> David J Taylor wrote:
>> David Woolley wrote:
>>> Danny Mayer wrote:
>>>
>>>> Increased polling frequency increases jitter.
>>> I think jitter was being used loosely here, not with the specific
>>> sense of high frequenc
Unruh wrote:
[]
> How do you get the signal in now? Do you have a parallel port?
> USB is terrible. But then Windows is terrible as well, so the two
> probably are about equivalent. If you can use the PPS you can get a
> few microseconds accuracy on a Linux/BSD ssytem. I think on Windows
> you are
jack wrote:
> Hi all,
>
> I am trying to sync my Windows box to an external GPS source. I
> currently have BU353, whose output is not very periodic. I read up on
> ntpd implementation that uses PPS signal but I don't even have an RS
> 232 port on my computer.
>
> My questions:
> 1) what's the best
Richard B. Gilbert wrote:
[]
> I've been using Comcast for five or six years now without a problem!
> YMMV.
There have been a few problems with my ISP, hence I moved to a 3rd party.
> I could set up my own DNS server but what would be the point? A hosts
> file provides the addresses of the node
Richard B. Gilbert wrote:
[]
> Where, other than your ISP, would you go for DNS? If you are a home
> user what choices do you have? If you are responsible for a
> multi-user site it may make sense to operate your own DNS? I'm
> working from a two-user site and using my ISP's DNS. I'm paying
> C
David Woolley wrote:
> Danny Mayer wrote:
>
>> Increased polling frequency increases jitter.
>
> I think jitter was being used loosely here, not with the specific
> sense of high frequency variations.
Yes, my original question referred to looking at a graph of offset plotted
over a day (sampling
Dave Hart wrote:
> On Mar 2, 1:46 pm, "David J Taylor" this-bit.nor-this.co.uk> wrote:
>>
>> Folks,
>>
>> Dave Hart asked that I post this information:
>>
>> Very briefly, I happen to have a 100Hz system, and have been playing
>> with
Richard B. Gilbert wrote:
[]
> I ran into this when a Norton Anti-Virus site would not let me renew
> my license. Short of sending them snail-mail there was NO way to let
> them know their site was badly broken!
>
> I installed a competing product (freeware) and have not had any
> problems with it
Harlan Stenn wrote:
[]
> Appreciated, and again, I was speaking to an audience that included,
> but was not limited to, you.
Thanks, Harlan.
I welcome the efforts to put NTP on a sounder financial footing. The best
I can do with the companies I work for is to make them aware of NTP, which
I do
Steve Kostecke wrote:
[]
> The canonnical address for contacting the individuals responsible for
> the operation of any web-site is webmas...@thedomain. One does not
> need to see a web-page to learn this.
Steve, I'm delighted to hear that ntp.org still conform to this
convention, but very many W
Steve Kostecke wrote:
> On 2009-03-03, David J Taylor wrote:
[]
>> I did not "complain", I asked whether what I was seeing was correct,
>> and some others confirmed this.
>
> Quibling over which word I used misses the point.
To me there is a distinct difference
Steve Kostecke wrote:
[]
> I reported the problem using the correct channels and it was resolved.
>
> You're very lucky that I read the news-group before starting to work
> this morning; I don't always do so. If I had not I would not have seen
> your complaint for many hours, possibly not until ton
Steve Kostecke wrote:
> On 2009-03-03, David J Taylor wrote:
>
>> Guess I will wait for OpenDNS to become updated...
>
> http://www.opendns.com/support/article/197 lists the OpenDNS
> nameserver addresses.
>
> $ host www.ntp.org 208.67.220.220
> www.ntp.org
Rob wrote:
> David J Taylor
> wrote:
>> Terje Mathisen" <"terje.mathisen at tmsw.no wrote:
>>> David J Taylor wrote:
>>>> http://www.ntp.org/ => a blank page in both Firefox and Internet
>>>> Explorer Is this correct?
>>>
&
Terje Mathisen" <"terje.mathisen at tmsw.no wrote:
> David J Taylor wrote:
>> http://www.ntp.org/ => a blank page in both Firefox and Internet
>> Explorer Is this correct?
>
> No, it works here, now (20 minutes after your post).
>
> Terje
Thanks, T
http://www.ntp.org/ => a blank page in both Firefox and Internet Explorer
Is this correct?
Thanks,
David
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Jason wrote:
[]
> G. What have I missed, or gotten confused?
[]
> Thanks,
>
> Jason.
You forgot to say what the going rate is for the consultancy you want!
David
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ryad@gmail.com wrote:
> Hi everybody,
>
> I've bought 10 PCs with identical hardware (motherboard,...).
> The PCs are located in the same room and running identical
> configurations for 4 days now.
> They are synchronized using garmin 18 GPSes.
>
> I've just checked the NTP's loopstats file and
Dave Hart wrote:
[]
> I'm particularly interested in how it works on systems with 100 Hz
> system clock interrupts (10 msec period). All my test flock are 64
> Hz. This version (and my prior test versions going back weeks) tells
> you your system clock period in the event log or configured log fi
Harlan Stenn wrote:
>>>> In article , "David J
>>>> Taylor"
>>>> writes:
>
> David> Thanks for that, Dave. It's a pity that a change available in
> 2003 David> hadn't made it into my 2005 download!
>
> This is why I
Unruh wrote:
[]
> Mill's assumptions about the behaviour of clocks is almost certainly
> wrong.
> Not least because computer clocks are in a highly variable thermal
> environment. This means that the drift rate varies with time of day
> and day
> of week and is NOT 1/f or any other time invariant s
Unruh wrote:
[]
> YOu have a couple of answers, both of which are probably wrong and are
> asking which it is. As stated your premise is bad. It depends is the
> best
> answer you are going to get. It depends on the source of the jitter.
> Measurement noise? clock drift noise? assymetric network de
David Woolley wrote:
> David J Taylor wrote:
>
>>
>> Neither, directly. I mean the peak-to-peak variation in the reported
>> offset, as "measured" by eye on a graph like the "Daily" graph here:
>
> For a Millsian network, the peak to peak value
David Woolley wrote:
> David J Taylor wrote:
>
>>
>> Does anyone know an approximate relationship between polling interval
>> and peak-to-peak jitter for a non-ref-clock system? I.e would the
>> jitter offset) go up linearly with polling interval, or as the
>>
I know it's probably one of those "how long is a piece of string"
questions but
Does anyone know an approximate relationship between polling interval and
peak-to-peak jitter for a non-ref-clock system? I.e would the jitter
offset) go up linearly with polling interval, or as the square, or
Dave Hart wrote:
> On Feb 27, 5:38 pm, Dave Hart wrote:
>> When Dr. Mills first announced the change allowing the other peers'
>> intervals to go up with a refclock configuration, I believe he
>> observed a benefit from the mixed poll intervals, but he was thinking
>> at least two levels above my
Dave Hart wrote:
[]
>> Thats doesn't seem to happen with my FreeBSD system, if I am
>> understanding you correctly. Admittedly I have ntpd 4.2.0-a, but all
>> servers have a 64s polls even though there is no minpoll or maxpoll
>> specified.
>
> I'm not sure how long ago the change happened, but it
Dave Hart wrote:
> On Feb 26, 11:27 pm, "David J Taylor"
> wrote:
>> Well, by observation, /all/ the servers are polled at 64s intervals,
>> and not just the lan-gps-pps server.
>
> Since your clients are naturally preferring the stratum 1 on the same
>
Unruh wrote:
> "David J Taylor"
>> server lan-gps-pps prefer iburst maxpoll 6
>> server 0.uk.pool.ntp.org iburst
>> server 1.uk.pool.ntp.org iburst
>> server 2.uk.pool.ntp.org iburst
>
>> If I do this, is the maxpoll for the Internet servers al
Folks,
It's been suggested that if I have a mixture of a "known-good" (i.e.
GPS/PPS-based) LAN server, and some Internet-based backup servers, I could
use an ntp configuration file with different maxpolls, with the idea that
syncing more often to a good source will produce even lower offsets.
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