Re: [ntp:questions] ntpd on embedded risc

You may want to use mlockall() to lock ntp into RAM and prevent it from being swapped. You may also need to use sched_setscheduler() to make it a real-time process with a high priority. These changes will require a little hacking. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI

Re: [ntp:questions] ntpd on embedded risc

: change...@1.1251, 2004-11-03 01:51:42-05:00, st...@pogo.udel.edu +1 -0 Disable mlockall() under linux for now - resolver problems. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org

Re: [ntp:questions] ntpd on embedded risc

Harlan Stenn writes: I remember - libc (or whatever) under linux allocates a HUGE amount of space and that means the forked resolver process cannot get enough memory to work. That bug shouldn't bite the OP, though. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] http://www.ntp.org/ = a blank page?

not just disable it on all your machines? -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] What exactly does Maximum Distance Exceded mean?

Richard B. Gilbert writes: None at all. I don't pay for it! If I were the system administrator for a commercial system supporting a business, I would be paying Sun for some level of support. And you can purchase support for Free Software. Even old, obsolete versions. -- John Hasler j

Re: [ntp:questions] GPS-UTC Leap Corrections

kicks in. Leap seconds could be handled the same way DST is. You just structure your zonefile such that the 15 seconds becomes 16 after the effective date of the leap second. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] Query about NTP accuracy

specifications that tell you how much it matters. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] strange time behaviour

seen it here, as would the many others who've run that kernel for thousands of hours. I suspect something in the application is loading down the kernel and causing it to lose ticks. 1000 ticks is pretty fast for a Geode. Do these machines have HPET clocks? HPET is broken by design. -- John

Re: [ntp:questions] .1 Microsecond Synchronization

. You will need to. Has someone already gotten in front of them with the reasons for this accuracy? Of course, recording timestamps with 100 nanosecond _precision_ is easy. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions

Re: [ntp:questions] .1 Microsecond Synchronization

to talk to the radio astronomers. They do this sort of thing all the time (not in real time, though). -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo

Re: [ntp:questions] .1 Microsecond Synchronization

(using custom software and hardware all the way down to the wire protocol, of course). -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] .1 Microsecond Synchronization

of how such things were handled? -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] .1 Microsecond Synchronization

/citation.cfm?id=359545.359563coll=ACMdl=ACMCFID=39377835CFTOKEN=9 -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] .1 Microsecond Synchronization

Joe Gwinn writes: Lamport's webpage has it for free. Sorry. I missed the little PDF link. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo

Re: [ntp:questions] ntpd on dial up machine: no DNS resolving = giving up on all servers

. For most dialup users it works out of the box. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

(Debian certainly does). I would be surprised if the BSD distributions don't do so as well. IMHO a standardized, automated and decentralized way of distributing changes to timezone files might be useful, though. It just should not be part of NTP. -- John Hasler j...@dhh.gt.org Dancing Horse

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

Jan writes: If local time were used only on equipment that has a presentation layer (OSS and BSS), then this would reduce the size of the problem by at least one if not two orders of magnitude. Better to use UTC everywhere and convert to local time only for presentation. -- John Hasler j

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

would be minimal. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

at least as loony as those in the US, and some change the starting and/or ending dates with as little as a few weeks notice. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

#Modulation_Format -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

check for new tzdata files would be trivial. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

no package-management at all but still may need to know about time zone changes. Of course, I am in no position to do anything but talk the idea up here and maybe write a client, so if no one cares we might as well drop it. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

Jim Pennino writes: Newer stuff tends to run a version of Linux or FreeBSD and you get updates as patches from the maker. Downloaded automatically as needed? What happens when the maker goes bust, shuts down their server, or decides the product is obsolete? -- John Hasler j...@dhh.gt.org

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

@monthly wget 'ftp://ftp.eu.openbsd.org/pub/OpenBSD/distfiles/DateTime-TimeZone*.tar.gz' Whatever works. I'm just proposing that the file be made available at a standard location on a well-known set of distributed servers. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

system used. The Olson database is the only one it makes sense to distribute. The information in general has been freely available for years. But only in an ad-hoc fashion. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] Can or should the NTP protocol eventually serve timezone data?

the rules change for your location again. The Debian tzdata package has been updated 34 times in the last three years due to changes in the timezone data. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions

Re: [ntp:questions] Meinberg NTP Software--Time Accuracy

during installation or figure it out from the localization. Good to hear that Linux has something, though. Ntp has been included in all major distributions for many years. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] Meinberg NTP Software--Time Accuracy

is an excellent idea, but I can't tell people Call your ISP and get the address of their NTP server. Besides, the bandwidth is negligible by current standards and the ISPs provide lousy service. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] Keeping NTP Honest

Unruh writes: Actrually I think but am not sure, that chrony can also run on FreeBSD but I might be wrong FreeBSD is supported as of 1.23. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions

Re: [ntp:questions] Keeping NTP Honest

. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] Keeping NTP Honest

reaction time. This is all noise. You want to filter it out, not track it. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] Keeping NTP Honest

and a thermistor to the clock crystal and hook them to appropriate control circuitry. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] 500ppm - is it too small?

Debian Chrony package does that and I believe that the Debian Ntp package does also. Maybe the solution Microsoft provides fits the needs of those. Does it keep the clock to within one second of correct? If so it probably all that most Windows users need. -- John Hasler j...@dhh.gt.org Dancing

Re: [ntp:questions] 500ppm - is it too small?

to the correct frequency. Of course, those crystals are also designed to be operated in an oven: your wrist. They have nearly zero temperature coefficients at body temperature. At higher or lower temperature their temperature coefficients can be substantial. -- John Hasler j...@dhh.gt.org Dancing

Re: [ntp:questions] 500ppm - is it too small?

Unruh writes: All I am saying is that there is no rational reason for the current limits. I had the impression that Dr. Mills' stability concerns have to do with the stability of networks of servers, not of individual servers. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] 500ppm - is it too small?

. We need to induce a grad student to do a stability analysis of a network of Chrony servers. Should be good for a published paper, if not a thesis subject. For extra credit follow up with an analysis of a network with both Ntpd and Chrony servers. -- John Hasler j...@dhh.gt.org Dancing Horse Hill

Re: [ntp:questions] 500ppm - is it too small?

nemo_outis writes: This doesn't inspire much confdence about the documentation of the architecture and design decisions regarding ntp. As with sausage an politics it is best not to examine any large software package too closely if one is squeamish. -- John Hasler j...@dhh.gt.org Dancing Horse

Re: [ntp:questions] 500ppm - is it too small?

but short is short. How do they fall short? -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] 500ppm - is it too small?

of it for which the price was very modest I don't do copyright infringement. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] 500ppm - is it too small?

Richard B. Gilbert writes: I believe that the reverence implementation is Copyrighted so there could be restrictions on distributing modified versions. Of course it is copyrighted. Open Source is not a synonym for public domain. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI

Re: [ntp:questions] 500ppm - is it too small?

nemo_outis writes: I do not, however, withdraw my earlier comments regarding the political overhead associated with the design and development of ntp. Every successful Open Source project I know of has similar overhead. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] 500ppm - is it too small?

that one look at bugs and examine them closely. You wouldn't want to be the cause of someone throwing up on his keyboard, would you? -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org

Re: [ntp:questions] lists.ntp.org uses an invalid security certificate....

https session. All it proves is that the site operators were able to write at least one check that didn't bounce. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org

Re: [ntp:questions] lists.ntp.org uses an invalid security certificate....

David writes: Thanks, Steve. Unfortunately, they offer no single-click install for Firefox. Click on Root Certificate (PEM Format). See http://wiki.cacert.org/wiki/BrowserClients for details. -- -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] PC DCF-77 signal emulation?

/stations/wwvb.htm. -- John Hasler j...@dhh.gt.org Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] PC DCF-77 signal emulation?

rate is one bit per second. Emulate it in software. http://en.wikipedia.org/wiki/DCF77 -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo

Re: [ntp:questions] ntpd: time reset problem

run both daemons at the same time. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] ntpd: time reset problem

both start by default on installation. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] question regarding NTP configuration for clusters, and cluster time stability

the one NTP is aimed at, though it obviously can be used to solve it. I can imagine protocols that would enable a cluster of peers to converge to a common time, but a (very) brief search doesn't turn up much. This probably means that I just don't know the right search terms. -- John Hasler jhas

Re: [ntp:questions] Strange NTP problem on AMD Geode LX cards.

is the goal of the regulations. I also don't see that it would make the clock worse. The random frequency modulation comes from a cycling PRNG and will average out to zero over a fairly short period. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] Strange NTP problem on AMD Geode LX cards.

the airwaves with the same amount of energy, only spread around slightly in frequency. So are you by standing there giving off thermal radiation. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions

Re: [ntp:questions] Strange NTP problem on AMD Geode LX cards.

I wrote: More like 200 nsec. No, more like tens of nanoseconds at most. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] Strange NTP problem on AMD Geode LX cards.

prosecution for fraud. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] question regarding NTP configuration for clusters, and cluster time stability

/pubs/pubs.html#time-clocks -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] Interface restrictions confusing me

outgoing packets on a port to establish a connection from inside. The firewall will recognize the reply packets as part of an established connection. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list

Re: [ntp:questions] If the EMI shoe was on the other foot...

David Woolley writes: EMI is at submultiples of the raw FSB side because instruction rates and loop rates also introduce strong periodic elements. Which spread-spectrum (especially real spread spectrum, less so mere FM) mitigates. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood

Re: [ntp:questions] NTP absolute accuracy?

David J Taylor writes: On consumer-grade circuits the assumption about equal round trip is unlikely to be valid. Why would you expect the asymmetry to be worse there than elsewhere? -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] NTP absolute accuracy?

that the dumber the network between me and the server the more likely I am to see symmetric latentcy. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman

Re: [ntp:questions] NTP absolute accuracy?

provide extremely aaccurate frequency references. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] NTP absolute accuracy?

I wrote: Should be as good as WWVB, which is good to within 100usec. But evidently many commercial receivers are only good to a ms or two. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions

Re: [ntp:questions] NTP absolute accuracy?

to get with a second. For high accuracy you would have to sync to the carrier, and possibly use the fast time codes. With WWVB I'd use an analog PLL to recover the carrier and a DPLL to get the PPS. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] NTP absolute accuracy?

. It's the UK equivalent of WWVB. http://resource.npl.co.uk/docs/networks/time/meeting3/martin.pdf -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman

Re: [ntp:questions] NTP absolute accuracy?

, but my very casual research indicate that even the fancy receivers don't bother to include the hardware necessary to do so. Too bad NIST can't find the money for the PRNG phase modulation DCF77 has. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] NTP absolute accuracy?

Bill Unruh writes: This is of course all made totally redundant by the GPS time delivery-- even makes up for the transmission delay. It begins to look like like Morse code in the days of cell phones. Quaint, but not really useful. One could say the same about NTP. -- John Hasler jhas

Re: [ntp:questions] question regarding NTP configuration for clusters, and cluster time stability

of accuracy. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] question regarding NTP configuration for clusters, and cluster time stability

N writes: Beware that ntp treats a PPS signal as a time source. A Rubidium oscillator is a frequency source, so it will slowly but inevitably run away, unless locked to a proper time source. And after a century or so it may actually run away as far as several milliseconds. -- John Hasler

Re: [ntp:questions] help with setting up NTP on windows with a USB GPS

). The fact that the used machine would work fine is irrelevant. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] OT: high-accuracy atomic clock to be attached outside of the International Space Station

don't think GPS time would be adequate for the planned research. I'm asking because I wouldn't expect GPS/Galileo/GLONASS to have been designed with in-orbit receivers in mind. GPS was. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] Meinberg NTP monitor, silly question

has only been demonstrated, not proven. Know anybody who needs a thesis subject? -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions

Re: [ntp:questions] Is dispersion jitter in all situations

% confidence interval for it. That is, he wants to be able to say The time is within +- 4.2usec of 2300UTC with 95% confidence. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http

Re: [ntp:questions] Tobit LAN!Time DCF77 receiver not working

. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions

Re: [ntp:questions] Tobit LAN!Time DCF77 receiver not working

Rob writes: I have both DCF77 and GPS receivers connected and there is a very clearly visible change in the relative offsets between those over a day/night cycle. This is of ms order of magnitude. You might be able to improve that by orienting your antenna to better reject skywave. -- John

Re: [ntp:questions] Simple but good NTP server

Richard B. Gilbert writes: Routers usually do not make good GPS clocks! If they are functioning as routers they have work to do and time keeping is not a priority. I think the idea is to buy a router because it is cheap hardware but to use it only to run NTP. -- John Hasler jhas

Re: [ntp:questions] ntpd and database servers

that time while it slews. Aside from the implementation difficulties, that could lead to the server and its clients using substantially different times during the slew. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] problem with ntpd refclock and pps via parallel port

submit bug reports. I'm the listmaster. I just checked: you show up as Waiting for confirmation on all three lists. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http

Re: [ntp:questions] problem with ntpd refclock and pps via parallel port

sorry. When you subscribe the mailing list sends you a confirmation message to which you must reply in order to start receiving the list. Otherwise pranksters could subscribe you. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] National time standard differences

Hal Murray writes: My best guess is that the switch was there so they could run the experiment to test/verify relativity. Or to test/verify the correction software. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions

Re: [ntp:questions] National time standard differences

Danny writes: The reason that they have to apply general relativistic corrections is that their clocks are far more precise than anything that even a cesium clock will give you. Their current uncertainty is about 5 x 10-16 with the NIST-F1 clock. Do they correct for latitude? -- John Hasler

Re: [ntp:questions] Which version of Linux works best?

. Why? -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions

Re: [ntp:questions] Quick sync between two computers not connected to the internet

Rick Jones writes: Is it still trivial in a below-ground data center? Use the NIST dialup service: http://tf.nist.gov/service/time-computer.html -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list

Re: [ntp:questions] Quick sync between two computers not connected to the internet

matter as long as they are within milliseconds of each other. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions

Re: [ntp:questions] Monitoring FreeBSD temperatures remotely

Dave B. writes: And as for that editor 'vim' If you thought Notepad was bad.. Some documentation as to how to use that is sorely needed! vim -h man vim vimtutor There has to be an easier to use text file editor that can be used? Emacs. -- John Hasler jhas...@newsguy.com Dancing Horse

Re: [ntp:questions] Monitoring FreeBSD temperatures remotely

I wrote: Emacs. unruh writes: Whether or not that is easier [than vim] is very much in the eye of the user. Yes. However, we don't know much about the eye of this user: what is he familiar with? What has he used that he likes? Not Notepad, evidently. -- John Hasler jhas...@newsguy.com

Re: [ntp:questions] how to have offset 1ms

is to install a gps. Until he fixes his network that will only give him good accuracy on the machine connected directly to the UPS. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http

Re: [ntp:questions] how to have offset 1ms

already be capable of providing time service. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions

Re: [ntp:questions] how to have offset 1ms

a network problem that he must solve first no matter what he does for a time source. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions

Re: [ntp:questions] how to have offset 1ms

the ship or control the engines). [1] A bit of Googling indicates that the major players are trying to lock ships into proprietary networks for bridge electronics. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions

Re: [ntp:questions] how to have offset 1ms

perhaps you could hook into one of it's RS232 or PPS ports? -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions

Re: [ntp:questions] how to have offset 1ms

allowed to install his own GPS (which wouldn't make sense any way: if he can get permission to do so he should hook it to the ACEB box.) -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org

Re: [ntp:questions] how to have offset 1ms

(60kHz/77kHz) signals that only propagate a thousand miles or so and not at all through steel. In any case it is clear that the ACEB box can provide the performance he needs if he can only communicate with it. He has a networking problem, not a timekeeping problem. -- John Hasler jhas

Re: [ntp:questions] how to have offset 1ms

source. Have all the clients connect to it and allow only the timeserver to connect to the ACEB. BTW did you contact the manufacturer about that problem? -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list

Re: [ntp:questions] how to have offset 1ms

had it hooked up to a GPS antenna it would use the GPS signal to discipline the crystal so that when the GPS signal went out for a few hours your time would only drift off by a few microseconds. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA

Re: [ntp:questions] how to have offset 1ms

Rob writes: I think [Bill Unruh] is just a student with no professional experience at all. ROFL. I suggest that you consult Google. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions

Re: [ntp:questions] how to have offset 1ms

is not an office window (if the compartment even has one). -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions

[ntp:questions] Cheap ($29.90) GPS receiver

is a PPS signal. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions

Re: [ntp:questions] GPS reception problem in UK

uwe writes: The ash will change dielectric properties. real and imaginary ( as in lossy ) If there was enough of it to significantly attenuate microwaves it would dim the sun substantially. It doesn't show up on radar except at densities far higher than that over Europe. -- John Hasler jhas

Re: [ntp:questions] Cheap ($29.90) GPS receiver

one to play with myself but I can't afford it. I thought maybe some people here would be interested. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo

Re: [ntp:questions] Cheap ($29.90) GPS receiver

Terje writes: It would still be limited to the resolution of the rs232 clock, i.e. ~1ms, instead of the ~1us we usually get from PPS receivers. The documentation claims 1us (again, that just what I read. I don't have one.) The RS232 could be synchronized to the PPS internally. -- John Hasler

Re: [ntp:questions] Cheap ($29.90) GPS receiver

Hal writes: Some of the serial chips have large FIFOs and wait until the FIFO has several characters and/or there is no activity for a while. I'm sure they can all be programmed to emulate the 8250 and interrupt whenever a character is ready. -- John Hasler jhas...@newsguy.com Dancing Horse

Re: [ntp:questions] Reference Clock driver for getting time via date command over telnet?

David Wooley writes: He's not using telnet as telnet; he's using the telnet client as a generic TCP client. He might do better with netcat. -- John Hasler jhas...@newsguy.com Dancing Horse Hill Elmwood, WI USA ___ questions mailing list questions

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