Re: [ntp:questions] NTP offset doesn't change.

2015-02-16 Thread Paul
On Mon, Feb 16, 2015 at 1:11 AM, William Unruh un...@invalid.ca wrote: But that is not what you said. When I asked how ntimed works you answered that it disciplines the computer clock. BZZT! You said: Be interesting to see how and what it does. To which I replied: Since I've told you how

Re: [ntp:questions] NTP offset doesn't change.

2015-02-15 Thread Paul
On Sat, Feb 14, 2015 at 11:21 PM, William Unruh un...@invalid.ca wrote: If you demand that I give detailed explanation You started off down the ntpd versus chrony path again. To get the discussion started, lets compare some of the differences between chrony and ntpd That's not useful.

Re: [ntp:questions] NTP offset doesn't change.

2015-02-15 Thread David Lord
Harlan Stenn wrote: David Lord writes: ... The one big flaw with ntpd is that when motherboard temperature changes too quickly the ntpd control loop is broken and ntp offset can rise from 300u to 10ms. That might have been a false alarm. I've not yet been able to search all the logs.

Re: [ntp:questions] NTP offset doesn't change.

2015-02-15 Thread Philip Homburg
In article mbqnu5$f15$3...@dont-email.me, William Unruh un...@invalid.ca wrote: I bring up chrony not to discuss it as a program but todiscuss its philosophy of clock control and its design. It presents an alternative to the approach of ntpd, which ntimed appears to be following. There is

Re: [ntp:questions] NTP offset doesn't change.

2015-02-15 Thread William Unruh
On 2015-02-15, Philip Homburg phi...@ue.aioy.eu wrote: In article mbqnu5$f15$3...@dont-email.me, William Unruh un...@invalid.ca wrote: I bring up chrony not to discuss it as a program but todiscuss its philosophy of clock control and its design. It presents an alternative to the approach of

Re: [ntp:questions] NTP offset doesn't change.

2015-02-15 Thread William Unruh
On 2015-02-15, Paul tik-...@bodosom.net wrote: On Sat, Feb 14, 2015 at 11:21 PM, William Unruh un...@invalid.ca wrote: If you demand that I give detailed explanation You started off down the ntpd versus chrony path again. To get the discussion started, lets compare some of the

Re: [ntp:questions] NTP offset doesn't change.

2015-02-15 Thread Philip Homburg
In article mbqt2f$b9i$1...@dont-email.me, William Unruh un...@invalid.ca wrote: The documentation has some, but much is in the code. I think that's bad situation if you want the ideas embedded in the code to be adopted by other implementations. -- We just programmed the computers to revive

Re: [ntp:questions] NTP offset doesn't change.

2015-02-15 Thread Paul
On Sun, Feb 15, 2015 at 1:18 PM, William Unruh un...@invalid.ca wrote: Thank you. I had no idea what the new version was called, and saw someone call it timed. Sorry if it confused you. This means you're not paying attention to details. It also means you're not reading PHK's notes. I

Re: [ntp:questions] NTP offset doesn't change.

2015-02-15 Thread William Unruh
On 2015-02-16, Paul tik-...@bodosom.net wrote: On Sun, Feb 15, 2015 at 1:18 PM, William Unruh un...@invalid.ca wrote: It I say to someone-- I hear you are trying out the new Subaru, I wonder how it works If you ask me how my new Subaru works I'd say fine. If you ask me how much But that

Re: [ntp:questions] NTP offset doesn't change.

2015-02-14 Thread William Unruh
On 2015-02-15, David Lord sn...@lordynet.org wrote: William Unruh wrote: On 2015-02-14, Paul tik-...@bodosom.net wrote: On Sat, Feb 14, 2015 at 2:09 PM, William Unruh un...@invalid.ca wrote: Yes but you said This means that if you are using say a PPS source, which gives microsecond long

Re: [ntp:questions] NTP offset doesn't change.

2015-02-14 Thread Paul
On Fri, Feb 13, 2015 at 8:48 PM, William Unruh un...@invalid.ca wrote: I had a properly set up PPS source to do the comparison. As did I. Ooops, I see that the text/plain part of the message was damaged. I was quoting you saying: I had a properly set up PPS source and my response was we

Re: [ntp:questions] NTP offset doesn't change.

2015-02-14 Thread William Unruh
On 2015-02-14, Paul tik-...@bodosom.net wrote: On Fri, Feb 13, 2015 at 8:48 PM, William Unruh un...@invalid.ca wrote: However you've not responded to my question regarding your deep concerns. For years you've complained about the ntpd pll and on occasion suggested chrony. Now a replacement

Re: [ntp:questions] NTP offset doesn't change.

2015-02-14 Thread Paul
On Sat, Feb 14, 2015 at 2:09 PM, William Unruh un...@invalid.ca wrote: Because ntpd is what I know. Except you've admitted you don't know NTPd. If you are saying that this is all up in the air again with the new replacement, that would be great. But I have seen no evidence thereof in

Re: [ntp:questions] NTP offset doesn't change.

2015-02-14 Thread William Unruh
On 2015-02-14, Paul tik-...@bodosom.net wrote: On Sat, Feb 14, 2015 at 2:09 PM, William Unruh un...@invalid.ca wrote: Yes but you said This means that if you are using say a PPS source, which gives microsecond long term offset, it can take many hours to get there and I was responding to

Re: [ntp:questions] NTP offset doesn't change.

2015-02-14 Thread David Lord
William Unruh wrote: On 2015-02-14, Paul tik-...@bodosom.net wrote: On Sat, Feb 14, 2015 at 2:09 PM, William Unruh un...@invalid.ca wrote: Yes but you said This means that if you are using say a PPS source, which gives microsecond long term offset, it can take many hours to get there and I

Re: [ntp:questions] NTP offset doesn't change.

2015-02-14 Thread Paul
On Sat, Feb 14, 2015 at 6:38 PM, William Unruh un...@invalid.ca wrote: When timed is actually out I may be interested in testing it again. Ntimed-client. Again? So you've installed the code? https://github.com/bsdphk/Ntimed That seems unlikely. Read this:

Re: [ntp:questions] NTP offset doesn't change.

2015-02-14 Thread Harlan Stenn
David Lord writes: ... The one big flaw with ntpd is that when motherboard temperature changes too quickly the ntpd control loop is broken and ntp offset can rise from 300u to 10ms. Assuming the above is true (and I have no reason to doubt David's numbers) I have to wonder if it would be an

Re: [ntp:questions] NTP offset doesn't change.

2015-02-13 Thread Rob
Terje Mathisen terje.mathi...@tmsw.no wrote: Charles Swiger wrote: On Feb 12, 2015, at 1:56 AM, Rob nom...@example.com wrote: However, what I observe is that the plots of the offset show the derivative of the environment temperature, which unfortunately cannot be controlled any better. I am

Re: [ntp:questions] NTP offset doesn't change.

2015-02-13 Thread Rob
William Unruh un...@invalid.ca wrote: No, that is a hardware solution. There are software solutions-- a termistor to meaure the temperature of the crystal ( or somethign nearby) which feeds that measurement to the OS. the revised ntp then reads the temperature, and corrects the drift rate as a

Re: [ntp:questions] NTP offset doesn't change.

2015-02-13 Thread Miroslav Lichvar
On Fri, Feb 13, 2015 at 05:42:54AM +, William Unruh wrote: On 2015-02-13, Paul tik-...@bodosom.net wrote: On Thu, Feb 12, 2015 at 7:27 PM, William Unruh un...@invalid.ca wrote: It was based on measurements I made with ntpd Are you assuming the numbers I provided are based on theory

Re: [ntp:questions] NTP offset doesn't change.

2015-02-13 Thread Terje Mathisen
David Lord wrote: Solutions that measure the temperature require calibration for the individual crystal as with the cheap crystals used the drift per deg C can be either positive or negative and also depending on cut of the crystal can follow a parabolic or lazy S curve. The only reasonable

Re: [ntp:questions] NTP offset doesn't change.

2015-02-13 Thread David Lord
Rob wrote: Terje Mathisen terje.mathi...@tmsw.no wrote: Charles Swiger wrote: On Feb 12, 2015, at 1:56 AM, Rob nom...@example.com wrote: However, what I observe is that the plots of the offset show the derivative of the environment temperature, which unfortunately cannot be controlled any

Re: [ntp:questions] NTP offset doesn't change.

2015-02-13 Thread Paul
On Fri, Feb 13, 2015 at 12:42 AM, William Unruh un...@invalid.ca wrote: OK, so we seem to have two different sets of experiments with very different results. Note that I did not erase the drift file, or restart ntpd after my perturbation. Okay, I offset my clock by 100ms without restarting

Re: [ntp:questions] NTP offset doesn't change.

2015-02-13 Thread Charles Swiger
On Feb 12, 2015, at 11:21 PM, Terje Mathisen terje.mathi...@tmsw.no wrote: I've considered packing some insulation around the crystal, this would tend to stabilize (while also increasing) the temperature, but this would also be likely to reduce its lifetime, and the motherboard would probably

Re: [ntp:questions] NTP offset doesn't change.

2015-02-13 Thread Rob
David Lord sn...@lordynet.org wrote: Rob wrote: Terje Mathisen terje.mathi...@tmsw.no wrote: Charles Swiger wrote: On Feb 12, 2015, at 1:56 AM, Rob nom...@example.com wrote: However, what I observe is that the plots of the offset show the derivative of the environment temperature, which

Re: [ntp:questions] NTP offset doesn't change.

2015-02-13 Thread William Unruh
On 2015-02-13, Paul tik-...@bodosom.net wrote: On Fri, Feb 13, 2015 at 12:42 AM, William Unruh un...@invalid.ca wrote: OK, so we seem to have two different sets of experiments with very different results. Note that I did not erase the drift file, or restart ntpd after my perturbation.

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread David Taylor
On 12/02/2015 17:00, William Unruh wrote: [] This means that if you are using say a PPS source, which gives microsecond long term offset, it can take many hours to get there, even if you or I looking at the offsets could see that it is off by ms after the first few poll intervals. [] Almost

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Charles Swiger
On Feb 12, 2015, at 12:49 AM, William Unruh un...@invalid.ca wrote: On 2015-02-11, Charles Swiger cswi...@mac.com mailto:cswi...@mac.com wrote: On Feb 11, 2015, at 7:23 AM, Rob nom...@example.com mailto:nom...@example.com wrote: But I see it has also been explained elsewhere in the thread:

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Charles Swiger
On Feb 12, 2015, at 1:56 AM, Rob nom...@example.com wrote: Charles Swiger cswi...@mac.com wrote: On Feb 11, 2015, at 7:23 AM, Rob nom...@example.com wrote: But I see it has also been explained elsewhere in the thread: ntpd has a maximum on the momentary drift of 500ppm, no matter if it is

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Harlan Stenn
Bill, So you believe: - the broken linux kernel behavior is an acceptable (or at least excusable) fact of life, - that should have been predicted and accommodated by stable-running software and algorithms that have been around for decades, - where no other kernel has ever misbehaved in

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-12, Rob nom...@example.com wrote: William Unruh un...@invalid.ca wrote: On 2015-02-12, Rob nom...@example.com wrote: Brian Inglis brian.ing...@systematicsw.ab.ca wrote: On 2015-02-12 03:00, Rob wrote: catherine.wei1...@gmail.com catherine.wei1...@gmail.com wrote: Yes,I just tested

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Philip Homburg
In article mbinbu$a5r$1...@dont-email.me, William Unruh un...@invalid.ca wrote: The complaint of the ntpd people is not the stability of the machine itself, but the stability of the network, where for example A could use B and B use A in determining its own time. Is the whole network stable under

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-11, Charles Swiger cswi...@mac.com wrote: On Feb 11, 2015, at 7:23 AM, Rob nom...@example.com wrote: But I see it has also been explained elsewhere in the thread: ntpd has a maximum on the momentary drift of 500ppm, no matter if it is static or dynamic or the sum of two. I think

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-11, Paul tik-...@bodosom.net wrote: On Wed, Feb 11, 2015 at 4:32 PM, Harlan Stenn st...@ntp.org wrote: There are times repair is perfectly acceptable, and we do that. There are times replace is better, and we do that. My point is a long drawn-out discussion of changes to the

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread catherine . wei1989
On Wednesday, February 11, 2015 at 12:55:02 AM UTC+8, Jochen Bern wrote: On 02/10/2015 06:15 AM, catherine.wei1...@gmail.com wrote: However, when I wait for several minutes, the time can be adjusted to the right time. I couldn't see the gradual changes of offset. Is that normal? Assuming

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Rob
catherine.wei1...@gmail.com catherine.wei1...@gmail.com wrote: Yes,I just tested it and found that the synchronization of NTP is really slow. That is because ntpd is not designed to correct arbitrary errors that you have applied externally. It is designed to lock to the correct time and stay

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Rob
Charles Swiger cswi...@mac.com wrote: On Feb 11, 2015, at 7:23 AM, Rob nom...@example.com wrote: But I see it has also been explained elsewhere in the thread: ntpd has a maximum on the momentary drift of 500ppm, no matter if it is static or dynamic or the sum of two. I think that is not

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Brian Inglis
On 2015-02-12 03:00, Rob wrote: catherine.wei1...@gmail.com catherine.wei1...@gmail.com wrote: Yes,I just tested it and found that the synchronization of NTP is really slow. That is because ntpd is not designed to correct arbitrary errors that you have applied externally. It is designed to

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-12, Charles Swiger cswi...@mac.com wrote: On Feb 12, 2015, at 12:49 AM, William Unruh un...@invalid.ca wrote: On 2015-02-11, Charles Swiger cswi...@mac.com mailto:cswi...@mac.com wrote: On Feb 11, 2015, at 7:23 AM, Rob nom...@example.com mailto:nom...@example.com wrote: But I

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Paul
On Thu, Feb 12, 2015 at 12:00 PM, William Unruh un...@invalid.ca wrote: This means that if you are using say a PPS source, which gives microsecond long term offset, it can take many hours to get there This has been asserted and corrected before -- as in years ago*. A properly configured

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Harlan Stenn
William Unruh writes: ... And what happens to B when A suddenly begins to slew at 2000PPM? And how often does this happen? Why does it happen? I'm pretty sure that ntpd will notice this and declare that source a falseticker quickly enough. Chrony and ntpd have fundamentally different

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Rob
David Taylor david-tay...@blueyonder.co.uk.invalid wrote: On 12/02/2015 17:00, William Unruh wrote: [] This means that if you are using say a PPS source, which gives microsecond long term offset, it can take many hours to get there, even if you or I looking at the offsets could see that it is

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Harlan Stenn
catherine.wei1...@gmail.com writes: Yes,I just tested it and found that the synchronization of NTP is really slow. It's well documented. Adjustments are made at the rate of 500ppm. By default that will happen for corrections of up to 128ms. 500ppm is about 43 seconds/day, and a correction of

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-12, Charles Swiger cswi...@mac.com wrote: On Feb 12, 2015, at 1:56 AM, Rob nom...@example.com wrote: Charles Swiger cswi...@mac.com wrote: On Feb 11, 2015, at 7:23 AM, Rob nom...@example.com wrote: However, what I observe is that the plots of the offset show the derivative of the

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread David Lord
William Unruh wrote: On 2015-02-12, Charles Swiger cswi...@mac.com wrote: On Feb 12, 2015, at 1:56 AM, Rob nom...@example.com wrote: Charles Swiger cswi...@mac.com wrote: On Feb 11, 2015, at 7:23 AM, Rob nom...@example.com wrote: However, what I observe is that the plots of the offset show

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-12, Harlan Stenn st...@ntp.org wrote: Bill, So you believe: - the broken linux kernel behavior is an acceptable (or at least excusable) fact of life, Of course not. However, it IS a fact of life, and I have to live in the real world. nptd spends many lines of code correcting

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-12, Harlan Stenn st...@ntp.org wrote: William Unruh writes: ... And what happens to B when A suddenly begins to slew at 2000PPM? And how often does this happen? Why does it happen? I'm pretty sure that ntpd will notice this and declare that source a falseticker quickly enough.

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Charles Swiger
On Feb 12, 2015, at 4:02 PM, William Unruh un...@invalid.ca wrote: You're describing a TCXO; using a temperature sensor to compensate for thermal drift would gain perhaps a factor of 5 accuracy. No, that is a hardware solution. There are software solutions-- a termistor to meaure the

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-12, Paul tik-...@bodosom.net wrote: On Thu, Feb 12, 2015 at 12:00 PM, William Unruh un...@invalid.ca wrote: This means that if you are using say a PPS source, which gives microsecond long term offset, it can take many hours to get there This has been asserted and corrected before

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-13, Harlan Stenn st...@ntp.org wrote: William Unruh writes: On 2015-02-12, Harlan Stenn st...@ntp.org wrote: It would have been far better for folks with those broken kernels to have simply removed any drift file before starting ntpd. The code to remove the drift file could have

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Harlan Stenn
William Unruh writes: On 2015-02-12, Harlan Stenn st...@ntp.org wrote: Bill, So you believe: - the broken linux kernel behavior is an acceptable (or at least excusable) fact of life, Of course not. However, it IS a fact of life, and I have to live in the real world. nptd spends

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Paul
On Thu, Feb 12, 2015 at 7:27 PM, William Unruh un...@invalid.ca wrote: It was based on measurements I made with ntpd Are you assuming the numbers I provided are based on theory or were you looking over my shoulder when I perturbed system time by two milliseconds and watched it converge to

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Harlan Stenn
William Unruh writes: Chrony and ntpd have fundamentally different definitions of what it means to provide good time. Not really. But it should be distrubing that chrony disciplines clocks much better ( lower jitter) than does ntpd in normal situations. Why? And does that have lessons

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Paul
On Thu, Feb 12, 2015 at 7:16 PM, William Unruh un...@invalid.ca wrote: Not really. But it should be distrubing that chrony disciplines clocks much better ( lower jitter) than does ntpd in normal situations. Why? And does that have lessons that ntpd could learn from? If you don't stop

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Rob
Charles Swiger cswi...@mac.com wrote: However, what I observe is that the plots of the offset show the derivative of the environment temperature, which unfortunately cannot be controlled any better. I am considering to locate the crystal that is responsible for the timing and see if it could

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Harlan Stenn
William Unruh writes: ... (Ie something equivalent to ntpd's arbitrary 1000 sec rule-- ie if the clock is out by 1000 sec ntpd gives up). But whether or not it should give up, or try its best is something that should be left to the user, not to some arbitrary rules by the designer. Statement

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Terje Mathisen
Charles Swiger wrote: On Feb 12, 2015, at 1:56 AM, Rob nom...@example.com wrote: However, what I observe is that the plots of the offset show the derivative of the environment temperature, which unfortunately cannot be controlled any better. I am considering to locate the crystal that is

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-13, Paul tik-...@bodosom.net wrote: On Thu, Feb 12, 2015 at 7:27 PM, William Unruh un...@invalid.ca wrote: It was based on measurements I made with ntpd Are you assuming the numbers I provided are based on theory or were you looking over my shoulder when I perturbed system time

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Paul
On Thu, Feb 12, 2015 at 3:43 AM, William Unruh un...@invalid.ca wrote: It is hard to complain about a non-existant product. As has been previously mentioned ntimed(-client) is in early release. I've been running it since late December. ___ questions

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Rob
Brian Inglis brian.ing...@systematicsw.ab.ca wrote: On 2015-02-12 03:00, Rob wrote: catherine.wei1...@gmail.com catherine.wei1...@gmail.com wrote: Yes,I just tested it and found that the synchronization of NTP is really slow. That is because ntpd is not designed to correct arbitrary errors

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Philip Homburg
In article 54db57a8.4030...@oracle.com, brian utterback brian.utterb...@oracle.com wrote: Dr. Mills crafted a wonderful piece of software, amazing for its time, but he no longer actively engages us much at all. I understand, that isn't his fault. But no one who does actively engage really

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-12, catherine.wei1...@gmail.com catherine.wei1...@gmail.com wrote: On Wednesday, February 11, 2015 at 12:55:02 AM UTC+8, Jochen Bern wrote: On 02/10/2015 06:15 AM, catherine.wei1...@gmail.com wrote: However, when I wait for several minutes, the time can be adjusted to the right

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-12, Philip Homburg phi...@ue.aioy.eu wrote: In article 54db57a8.4030...@oracle.com, brian utterback brian.utterb...@oracle.com wrote: Dr. Mills crafted a wonderful piece of software, amazing for its time, but he no longer actively engages us much at all. I understand, that isn't his

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread William Unruh
On 2015-02-12, Rob nom...@example.com wrote: Charles Swiger cswi...@mac.com wrote: On Feb 11, 2015, at 7:23 AM, Rob nom...@example.com wrote: Yes I would prefer that, but chrony does not support local references so it is useless to me. Yes, it does and has for about 3 or 4 years now. In

Re: [ntp:questions] NTP offset doesn't change.

2015-02-12 Thread Rob
William Unruh un...@invalid.ca wrote: On 2015-02-12, Rob nom...@example.com wrote: Brian Inglis brian.ing...@systematicsw.ab.ca wrote: On 2015-02-12 03:00, Rob wrote: catherine.wei1...@gmail.com catherine.wei1...@gmail.com wrote: Yes,I just tested it and found that the synchronization of NTP

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread William Unruh
On 2015-02-11, Jochen Bern jochen.b...@linworks.de wrote: On 02/11/2015 10:01 AM, Rob wrote: Terje Mathisen terje.mathi...@tmsw.no wrote: The 500 ppm limit is not at all arbitrary! In fact, it was originally just 100 ppm, but when too many systems turned up with a system clock which was a

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread William Unruh
On 2015-02-11, Harlan Stenn st...@ntp.org wrote: William Unruh writes: On 2015-02-11, Harlan Stenn st...@ntp.org wrote: It's one thing if a system rarely steps. It's a bit different if those steps happen more frequently. Yes. And it is either equally rare that the system will go over

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread William Unruh
On 2015-02-11, Terje Mathisen terje.mathi...@tmsw.no wrote: William Unruh wrote: On 2015-02-11, Harlan Stenn st...@ntp.org wrote: William Unruh writes: On 2015-02-10, Terje Mathisen terje.mathi...@tmsw.no wrote: And as far as I can see, 500 or 5000 makes little difference to the control

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread Rob
Jochen Bern jochen.b...@linworks.de wrote: However, I've also seen hardware occasionally flip-flopping from -900 to +1100 and back, complete with the developers of the firmware blaming a bug in ntpd for failure to discipline *that*. Ok that is different, it is not a static drift. But I see it

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread Jochen Bern
On 02/11/2015 10:01 AM, Rob wrote: Terje Mathisen terje.mathi...@tmsw.no wrote: The 500 ppm limit is not at all arbitrary! In fact, it was originally just 100 ppm, but when too many systems turned up with a system clock which was a bit too far out, Prof Mills redid the control loop to

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread Harlan Stenn
Paul writes: On Wed, Feb 11, 2015 at 8:22 AM, brian utterback brian.utterb...@oracle.com wrote: But no one who does actively engage really understands it or knows how to improve it. Unruh has a point, we don't know if there isn't a better way built on statistical analysis. Since it

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread Harlan Stenn
Paul writes: On Wed, Feb 11, 2015 at 4:32 PM, Harlan Stenn st...@ntp.org wrote: There are times repair is perfectly acceptable, and we do that. There are times replace is better, and we do that. My point is a long drawn-out discussion of changes to the core of ntp seem less than

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread Charles Swiger
On Feb 11, 2015, at 7:23 AM, Rob nom...@example.com wrote: But I see it has also been explained elsewhere in the thread: ntpd has a maximum on the momentary drift of 500ppm, no matter if it is static or dynamic or the sum of two. I think that is not warranted. Do you believe that a clock

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread Paul
On Wed, Feb 11, 2015 at 4:32 PM, Harlan Stenn st...@ntp.org wrote: There are times repair is perfectly acceptable, and we do that. There are times replace is better, and we do that. My point is a long drawn-out discussion of changes to the core of ntp seem less than productive when the

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread Harlan Stenn
William Unruh writes: On 2015-02-11, Harlan Stenn st...@ntp.org wrote: It's one thing if a system rarely steps. It's a bit different if those steps happen more frequently. Yes. And it is either equally rare that the system will go over 500PPM, but sometimes a computer can have a large

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread Rob
Terje Mathisen terje.mathi...@tmsw.no wrote: The 500 ppm limit is not at all arbitrary! In fact, it was originally just 100 ppm, but when too many systems turned up with a system clock which was a bit too far out, Prof Mills redid the control loop to allow a 500 ppm range. It could have

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread William Unruh
On 2015-02-11, Harlan Stenn st...@ntp.org wrote: William Unruh writes: On 2015-02-10, Terje Mathisen terje.mathi...@tmsw.no wrote: William Unruh wrote: No. It only does that for offsets from Hades. The Ones from Hell, ntpd abandons all hope and quits. ( Hades is 128ms to 1000 sec, Hell is

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread brian utterback
On 2/11/2015 2:12 AM, Harlan Stenn wrote: William Unruh writes: On 2015-02-10, Terje Mathisen terje.mathi...@tmsw.no wrote: William Unruh wrote: No. It only does that for offsets from Hades. The Ones from Hell, ntpd abandons all hope and quits. ( Hades is 128ms to 1000 sec, Hell

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread Terje Mathisen
William Unruh wrote: On 2015-02-11, Harlan Stenn st...@ntp.org wrote: William Unruh writes: On 2015-02-10, Terje Mathisen terje.mathi...@tmsw.no wrote: And as far as I can see, 500 or 5000 makes little difference to the control loop. Yes, it is harder for other systems to follow one with a

Re: [ntp:questions] NTP offset doesn't change.

2015-02-11 Thread Paul
On Wed, Feb 11, 2015 at 8:22 AM, brian utterback brian.utterb...@oracle.com wrote: But no one who does actively engage really understands it or knows how to improve it. Unruh has a point, we don't know if there isn't a better way built on statistical analysis. Since it seems the NTF

Re: [ntp:questions] NTP offset doesn't change.

2015-02-10 Thread Jochen Bern
On 02/10/2015 06:15 AM, catherine.wei1...@gmail.com wrote: However, when I wait for several minutes, the time can be adjusted to the right time. I couldn't see the gradual changes of offset. Is that normal? Assuming that you're using a minimalistic configuration: Yes. ntpd would take almost

Re: [ntp:questions] NTP offset doesn't change.

2015-02-10 Thread Rob
catherine.wei1...@gmail.com catherine.wei1...@gmail.com wrote: Hi, I'm using the ntpd to sync time. When I change the current date for exampe to 0210020215 (2015-02-10 02:02), the actually current time is 2015-02-10 03:02, then I run ntpq -p for several times, the offset doesn't change at

Re: [ntp:questions] NTP offset doesn't change.

2015-02-10 Thread David Woolley
On 10/02/15 05:15, catherine.wei1...@gmail.com wrote: Hi, I'm using the ntpd to sync time. When I change the current date for exampe to 0210020215 (2015-02-10 02:02), the actually current time is 2015-02-10 03:02, then I run ntpq -p for several times, the offset doesn't change at all.

Re: [ntp:questions] NTP offset doesn't change.

2015-02-10 Thread Brian Inglis
On 2015-02-10 13:26, William Unruh wrote: However if this is the first time this running of ntpd has encountered this, eg at startup, if you use -x option it will jump the time even if the -g (panicGate) offset is 1000 sec. -- Take care. Thanks, Brian Inglis

Re: [ntp:questions] NTP offset doesn't change.

2015-02-10 Thread Terje Mathisen
William Unruh wrote: On 2015-02-10, Jochen Bern jochen.b...@linworks.de wrote: On 02/10/2015 06:15 AM, catherine.wei1...@gmail.com wrote: However, when I wait for several minutes, the time can be adjusted to the right time. I couldn't see the gradual changes of offset. Is that normal?

Re: [ntp:questions] NTP offset doesn't change.

2015-02-10 Thread William Unruh
On 2015-02-10, Jochen Bern jochen.b...@linworks.de wrote: On 02/10/2015 06:15 AM, catherine.wei1...@gmail.com wrote: However, when I wait for several minutes, the time can be adjusted to the right time. I couldn't see the gradual changes of offset. Is that normal? Assuming that you're using

Re: [ntp:questions] NTP offset doesn't change.

2015-02-10 Thread Harlan Stenn
William Unruh writes: On 2015-02-10, Terje Mathisen terje.mathi...@tmsw.no wrote: William Unruh wrote: No. It only does that for offsets from Hades. The Ones from Hell, ntpd abandons all hope and quits. ( Hades is 128ms to 1000 sec, Hell is 1000 sec) Ie, for 128ms, ntp will try to

Re: [ntp:questions] NTP offset doesn't change.

2015-02-10 Thread William Unruh
On 2015-02-10, Brian Inglis brian.ing...@systematicsw.ab.ca wrote: On 2015-02-10 13:26, William Unruh wrote: However if this is the first time this running of ntpd has encountered this, eg at startup, if you use -x option it will jump the time even if the -g

Re: [ntp:questions] NTP offset doesn't change.

2015-02-10 Thread William Unruh
On 2015-02-10, Terje Mathisen terje.mathi...@tmsw.no wrote: William Unruh wrote: On 2015-02-10, Jochen Bern jochen.b...@linworks.de wrote: On 02/10/2015 06:15 AM, catherine.wei1...@gmail.com wrote: However, when I wait for several minutes, the time can be adjusted to the right time. I

Re: [ntp:questions] NTP offset doesn't change.

2015-02-09 Thread catherine . wei1989
By the way, the ntp version I'm using is 4.2.8p1. Catherine. On Tuesday, February 10, 2015 at 1:15:21 PM UTC+8, catherin...@gmail.com wrote: Hi, I'm using the ntpd to sync time. When I change the current date for exampe to 0210020215 (2015-02-10 02:02), the actually current time is

[ntp:questions] NTP offset doesn't change.

2015-02-09 Thread catherine . wei1989
Hi, I'm using the ntpd to sync time. When I change the current date for exampe to 0210020215 (2015-02-10 02:02), the actually current time is 2015-02-10 03:02, then I run ntpq -p for several times, the offset doesn't change at all. ~ # ntpq -p remote refid st t when poll