AW: [chrony-users] chronyd: Can' Synchronize WHY ?

[<thomas.schmid@xxxxxxxxx>]

Hi Miroslav,
> -----Ursprüngliche Nachricht-----
> Von: Listengine [mailto:listengine@xxxxxxxxxxxxxxxxx] Im Auftrag von
> Miroslav Lichvar
> Gesendet: Freitag, 9. September 2011 17:08
> An: chrony-users@xxxxxxxxxxxxxxxxxxxx
> Betreff: Re: [chrony-users] chronyd: Can' Synchronize WHY ?
> 
> On Fri, Sep 09, 2011 at 06:56:48AM +0000, thomas.schmid@xxxxxxxxx
> wrote:
> > > The intervals for the two sources don't overlap, and there is no
> third
> > > source which would overlap one of the two, so chrony gives up on
> them.
> > Would you be so kind as to give me a "Dummie's Guid to "Overlap" ? I
> do
> > not understand much of the values presented (dropped out of too math
> class
> > too early :-)
> 
> There is an algoritm which is used to detect which server is "lying".
> Here is a description for the one used by ntp, chrony is similar:
> http://www.eecis.udel.edu/~mills/ntp/html/select.html
> 
> > MS Name/IP address        Stratum Poll LastRx Last sample
> >
> =======================================================================
> =====
> > ^* <WAN-IP1>                 1    6     67    -36us[ -463ms] +/-
> 85ms
> > ^+ SU-Server3                2    6     42   +394ms[ +394ms] +/-
> 133ms
> > ^+ <WAN-IP2>                 2    6     35    +83ms[  +83ms] +/-
> 47ms
> > ^? SU-Server1                0    7    10y     +0ns[   +0ns] +/-
> 0ns
> > ^? LU-Server                 0    7    10y     +0ns[   +0ns] +/-
> 0ns
> 
> Apparently the third server is no good either.
> 
> > chronyc> sourcestats
> > 210 Number of sources = 5
> > Name/IP Address            NP  NR  Span  Frequency  Freq Skew  Offset
> Std Dev
> >
> =======================================================================
> =======
> > <WAN-IP1>                  7   5   412  -1555.346   3022.979  -9053us
> 2933us
> > SU-Server3                 4   4   193  -2718.528  18920.604   +323ms
> 873us
> > <WAN-IP2>                  5   4   342  -2080.739   9921.691    +56ms
> 5675us
> > SU-Server1                 0   0     0      0.000   2000.000     +0ns
> 4000ms
> > LU-Server                  0   0     0      0.000   2000.000     +0ns
> 4000ms
> 
> Something is wrong, the skew values are extremely high. Usually, it's
> just couple ppm.
> 
> Is the client running in a virtual machine?
Only "SU-Server3" is running on Windows XP within a virtual machine, all
the other NTP servers (WAN-IP1, WAN-IP2) and this machine are real hardware..

> 
> --
> Miroslav Lichvar
> 
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