Re: [ntp:questions] Allan deviation survey

2010-09-13 Thread Joseph Gwinn
In article , unruh wrote: > On 2010-09-13, Joseph Gwinn wrote: > > Unruh, > > > > In article , > > unruh wrote: > > > >> On 2010-09-13, David L. Mills wrote: > >> > > [snip] > >> > >> > ... And, by the way, mail sent to your alleged mail address is > >> > returned to sender as undeliverab

Re: [ntp:questions] Allan deviation survey

2010-09-13 Thread Joseph Gwinn
In article <1f42m7-7gr2@ntp.tmsw.no>, Terje Mathisen <"terje.mathisen at tmsw.no"> wrote: > Joseph Gwinn wrote: > > The address did not look munged to me either. It makes perfect sense for a > > physicist to name servers after physics objects. > > > > The standard approach is to put the demu

Re: [ntp:questions] Allan deviation survey

2010-09-13 Thread David L. Mills
Miroslav, You don't need a week for that, since the anticipated intercept is in the order of 200 s (trace 3). However, plots such as these are really susceptible to little hidden resonances, so I tend to prefer a long tail and lots and lots of samples. For comparison, the averaging time for PP

Re: [ntp:questions] Allan deviation survey

2010-09-13 Thread David L. Mills
Miroslav, I think we are talking right past each other. Both Chrony and NTP implement the clock discipline using a second-order feedback loop that can minimize error in both time and frequency, although each uses a different loop filter. Chrony uses a least-squares technique; NTP uses a tradi

Re: [ntp:questions] Allan deviation survey

2010-09-13 Thread Terje Mathisen
Joseph Gwinn wrote: The address did not look munged to me either. It makes perfect sense for a physicist to name servers after physics objects. The standard approach is to put the demunging instructions in your sig. Like: "Please remove reference to the entrance to a worm's burrow from email a

Re: [ntp:questions] Allan deviation survey

2010-09-13 Thread unruh
On 2010-09-13, Joseph Gwinn wrote: > Unruh, > > In article , > unruh wrote: > >> On 2010-09-13, David L. Mills wrote: >> > [snip] >> >> > ... And, by the way, mail sent to your alleged mail address is >> > returned to sender as undeliverable. >> >> Yes, I am sorry about that but it is done

Re: [ntp:questions] Allan deviation survey

2010-09-13 Thread Joseph Gwinn
Unruh, In article , unruh wrote: > On 2010-09-13, David L. Mills wrote: > [snip] > > > ... And, by the way, mail sent to your alleged mail address is > > returned to sender as undeliverable. > > Yes, I am sorry about that but it is done in order to slightly reduce > the spam I get. It shou

Re: [ntp:questions] NTPd looses sync regularly / 12 hour intervals.

2010-09-13 Thread Martin Burnicki
Michael, sorry for the late reply. Michael Nielsen wrote: > Here are some more details from the ntp logging - ntp_mon peerstats.. > > It's doesn't seem to be a interrupt creep, as the server is maintaining > time properly all day, except for 30 mins each day. So once again this meets perfectly

[ntp:questions] [ntp:announce] NTP 4.2.6p3-beta1 Released

2010-09-13 Thread NTP Public Services Project
Redwood City, CA - 2010/09/11 - The NTP Public Services Project (http://support.ntp.org/) is pleased to announce that NTP 4.2.6p3-beta1, a Beta Release of the NTP Reference Implementation from the NTP Project, is now available at http://www.ntp.org/downloads.html and http://support.ntp.org/download

Re: [ntp:questions] Allan deviation survey

2010-09-13 Thread Miroslav Lichvar
On Fri, Sep 10, 2010 at 08:48:58PM +, David L. Mills wrote: > Miroslav, > > I've done this many times with several machines in several places > and reported the results in Chapter 12 and 6 in both the first and > second editions of my book, as well as my 1995 paper in ACM Trans. > Networking.

Re: [ntp:questions] Allan deviation survey

2010-09-13 Thread unruh
On 2010-09-13, David L. Mills wrote: > Bill, > > Please reread the definition of Allan deviation. It is a measure of That makes no difference to the intercept and simply adds a constant slope of -1 to the graph. And note that the most common use of ntp is to discipline the time, not the frequen

Re: [ntp:questions] Allan deviation survey

2010-09-13 Thread Miroslav Lichvar
On Fri, Sep 10, 2010 at 10:10:08PM +, David L. Mills wrote: > A previous message implied that, once the Allan characteristic was > determined, it would show chrony to be better than ntpd. Be advised > the default time constant (at 64 s poll interval) was specifically > chosen to match trace 1 o