Patrick Domack wrote:
> Plus, I dunno if anyone has done stats on this, but I
> haven't been able to sync two ntpd servers closer than .2ms over
> gigabit switch. I won't say I have a good benchmark setup for this
> though.
>
>
remote efid st t when poll reach delay offset jitter
=====================================================================
+GPS_NMEA(2) .GPS. 0 l 9 16 377 0.000 0.004 0.004
oPPS(1) .TRUE. 0 l 13 16 377 0.000 0.011 0.002
+truetime.localn .GPS. 1 u 10 16 377 0.391 -0.044 0.018
skipjack.no-suc 69.25. 2 u 17 16 42 15.207 -0.104 0.313
This box is 0.044 ms off from another stratum one via a gigabit and more
interestingly 0.104 ms from a peer on the other end of a DSL line. The
secret to very close sync is very short poll times - something you can
do if you own both boxes as I do in this example.
As an aside the box in question has three GPS refs - a GPS18, a PPS from
a Truetime GPS-DC and a Truetime GPS-100 stratum one neighbor.
John
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