[ntp:questions] SNTP with 1ms of precision?
David J Taylor
david-taylor at blueyonder.co.uk.invalid
Thu Jun 17 15:11:04 UTC 2010
> NTP can deliver a time accuracy of 1nsec?? I my point of view, NTP
> methods to estimate the round-trip path delay between the server and
> but the performance is limited by SO stack latency, it is an Application
> Layer protocol.
Marcelo, here's what /my/ NTP achieves:
The top three PCs (Pixie, Feenix and Stamsund) are each fed with a serial
GPS/PPS signal from a Garmin GPS-18 LVC or GPS-18X LVC. Three different
The bottom PCs are all Windows boxes of various versions, synced over a
LAN including a cheapo Netgear GS608 1Gb/s switch, a WRT54GL Samknows
performance measurement box, and a Netgear WNR2000v2 with wired and
I don't know whether any of those LAN-connected boxes would meet your
"1ms" requirement (although if there were all running FreeBSD they would
likely be significantly better than when running Windows).
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