[ntp:questions] Can NTP sync within 1ms

Paul tik-tok at bodosom.net
Fri Apr 25 15:24:04 UTC 2014


On Thu, Apr 24, 2014 at 11:07 AM, Montgomery, Peter BIS <
Peter.Montgomery at fs.utc.com> wrote:

> I would like to know whether NTP can sync between a client and a server
> within 1ms if the client and server are Linux applications on a simple
> local network ( less than 10 nodes).


As previously mentioned it depends.  (These machines are all on the same
network but the last one is wireless)

     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
-nub             .GPPS.           1 u  203 1024  377    0.676   -0.084
0.114
+black           .GPPS.           1 u  432 1024  377    0.345   -0.051
0.066
+aster           .GPPS.           1 u  914 1024  377    0.354   -0.093
0.083
*ntp1            .GPS.            1 u  299 1024  377    1.248   -0.055
0.120

     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
+aster           .GPPS.           1 u  140  256  377    0.383   -2.281
0.679
+ntp1            .GPS.            1 u   40  256  377    1.201   -2.306
0.703
*nub             .GPPS.           1 u  211  256  377    0.628   -2.457
0.706
+black           .GPPS.           1 u   32  256  377    0.184   -2.484
0.645

     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
+black           .GPPS.           1 u  897 1024  377    1.024   33.284
46.324
-nub             .GPPS.           1 u   45 1024  377   18.423   18.726
203.720
*aster           .GPPS.           1 u   86 1024  377   43.362   10.866
26.145
+ntp1            .GPS.            1 u  267 1024  377   25.155   21.369
75.804

For reference the view from one server:

     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
oPPS(0)          .GPPS.           0 l    4    8  377    0.000    0.001
0.002
*GPS_NMEA(0)     .FURY.           0 l    3    8  377    0.000   -0.041
0.029
 time-d.nist.gov .ACTS.           1 u   96  128  375   36.120    3.038
1.156
+nub             .GPPS.           1 s    6    8  376    0.171    0.005
0.007
+black           .GPPS.           1 s    3    8  377    0.032    0.016
0.009
+rPi1            .GPPS.           1 s    1    8  377    0.083    0.073
0.059
+ntp1            .GPS.            1 u    3   32  377    1.063   -0.115
0.003
+bbb2            .GPPS.           1 u    6    8  377    0.258   -0.066
0.008


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