[ntp:questions] NTP and SNTP in the end, give me precision of 1ms?
david at ex.djwhome.demon.co.uk.invalid
Sat Sep 13 21:37:08 UTC 2008
> An SNTP canot be a server if it is not tied to a hardware clock.
s/cannot/should not/ Pre-Windows 2003 versions of w32time are examples
of some things that are commonly used in violation of the rule.
Generally, though, Unruh is on the right lines; whilst you can make some
assumptions about the abilities of an NTP client, you can make none
about those of an SNTP one, as the specification says nothing about how
it uses the measurements it makes. (NTP is still at the mercy of
unusual configurations and hardware, software and networking issues.)
SNTP clients are often used with very long poll intervals, that are not
compatible with 1ms tracking.
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