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overhead
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... ], the model requires handcrafted
configuration tables in order to establish the hierarchy and avoid
loops. In addition to the burdensome, but presumably infrequent,
overheads of the election process, the offset measurement/correction
process requires twice as many messages as NTP per update ...
... LAN environments which support broadcast
and would result in unacceptable overhead in an internet environment. In
addition, for reasons given in Section 4 of this paper, the statistical
...
... time servers, run NTP with one or more of the primary servers.
In order to reduce the protocol overhead, the secondary servers
distribute time via NTP to the remaining local-net hosts ...
... Internet system. It is necessary to agree on the values
for these parameters in order to avoid unnecessary network overheads and
stable peer associations. The following parameters are assumed fixed and
applicable to all associations.
...
... with many
time servers. Wander causes needless network overhead, since the poll
interval is clamped at sys.poll as each new peer is selected for
synchronization and only slowly increases when the peer is no longer
...
... update the poll interval
system variable (sys.poll). This functions as an adaptive parameter that
provides a very valuable feature which reduces the polling overhead,
especially if the clock-combining algorithm described in Appendix F is
...
... synchronization paths to be substantially increased in order to reduce
network overhead. Following is a summary of previous versions of the
protocol together with details of the Version 3 ...
... This software clock model requires a processor interrupt on every tick,
which can cause significant overhead if the tick interval is small, say
in the order less 1 ms with the newer RISC processors. Thus, in order to
...
... and software to
provide precision timing with a minimum of software and processor
overhead. The model includes an oscillator, prescaler and hardware
counter; however, the oscillator frequency remains constant and the
...
... MHz for enhanced precision, the adjustment frequency must be increased
to 250 Hz, which substantially increases processor overhead. A modified
design suitable for high precision clocks is presented in the next
section.
...