[ntp:questions] Re: NTP Synch >125msec Delays?
terje.mathisen at hda.hydro.com
Thu Nov 13 07:02:57 UTC 2003
Adrian 'Dagurashibanipal' von Bidder wrote:
> Clinging to sanity, Brian Utterback mumbled in his beard:
>>While the delay is important, it doesn't really matter how long it is, as
>>long as it is less than the current polling period and that the round-trip
> I was under the impression that ntpd can deal with a certain level of
> asymmetry in the round-trip, with only a very small decrease in accuracy.
> Is that a misunderstanding on my part?
Yes, sort of:
NTPD cannot _deal_ with any kind of _constant_ asymmetry: This will
instead turn up as a fixed clock offset of half that asymmetry.
What NTPD can do, is to recognize and filter away fairly long periods of
temporary asymmetry, i.e. as caused by a period of heavy one-way network
traffic (big http/ftp downloads?).
To enable this extra filtering, you should look into the special options
for the configuration file, specifically 'tinker huffpuff':
- <Terje.Mathisen at hda.hydro.com>
"almost all programming can be viewed as an exercise in caching"
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