NTP can deliver a time accuracy of 1nsec?? I my point of view, NTP
includes
methods to estimate the round-trip path delay between the server and
client
but the performance is limited by SO stack latency, it is an Application
Layer protocol.
Marcelo, here's what /my/ NTP achieves:
http://www.satsignal.eu/mrtg/performance_ntp.php
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
operating systems.
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
wireless connections.
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).
Cheers,
David
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