[ntp:questions] Trimble Resolution T

Hal Murray hal-usenet at ip-64-139-1-69.sjc.megapath.net
Mon Oct 17 22:14:52 UTC 2011


In article <slrnj9oqdj.3i3.unruh at wormhole.physics.ubc.ca>,
 unruh <unruh at physics.ubc.ca> writes:

>In fact it is really hard for a computer to keep to 1us accuracy because
>of the delays in interrupt processing.

It's not the delay that is the problem.  It's simple to correct for a
fixed delay.  (at least in theory)  The problem is variations in the delay.

Jitter can easily be caused by cache faults or jitter in finishting the
processing of the current instruction, or having interrupts disabled.
(There are probably other sources.)


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