[ntp:questions] Re: ntpd transmit timestamp precision
Richard B. Gilbert
rgilbert88 at comcast.net
Sun Feb 19 22:30:34 UTC 2006
David L. Mills wrote:
> I'm uneasy calling random() for every read of the clock, as it could be
> expensive. It seems a bit overkill to fuzz the nanobits when the caller
> has timespec and fuzzed to 10 ms. Perhaps a test of precision greater
> than a microsecond is advised.
Why is this important for nptd to do? RFC 2030 calls for it in SNTP
implementations but doesn't ntpd have other means for detecting loops
and replays? Don't a LAN and/or a WAN introduce enough jitter to make
the low order bits meaningless in any case?
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