Hello Sniffer Folks,
We have been researching/refining the default ranges for GBUdb. Here
are our latest reference settings. These are conservative for large
systems (500/min) and should be even more conservative for smaller
systems.
Smaller systems that experience lower message rates will tend
to have lower confidence numbers in their GBUdb due to fewer message
interactions. If you run a system that sees fewer than 500 messages
per minute then you may achieve higher capture rates before FPs with
lower confidence values in some of your ranges.
Another way smaller systems may adjust their GBUdb sensitivity is to
adjust the time between condensation from one day to two days (or
more) or to eliminate the time based trigger and rely on the memory
usage trigger instead (by triggering condensation events only when a
specific memory threshold has been reached). The latter method is
typically recommended for systems with fewer than 10 messages per
minute.
All of the above tuning recommendations are somewhat experimental
since GBUdb is relatively new and at present sparsely populated (about
300 participating nodes at present). As time goes on we will all learn
more about how to optimize GBUdb - please experiment cautiously and
scientifically (one change at a time and understand what has happened)
and please share your results.
Here is the current reference:
<regions>
<white on-off='on' symbol='0'>
<edge probability='-1.0' confidence='0.4'/>
<edge probability='-0.8' confidence='1.0'/>
<panic on-off='on' rule-range='1000'/>
</white>
<caution on-off='on' symbol='40'>
<edge probability='0.1' confidence='0.0'/>
<edge probability='0.8' confidence='0.3'/>
</caution>
<black on-off='on' symbol='63'>
<edge probability='0.8' confidence='0.2'/>
<edge probability='0.8' confidence='1.0'/>
<truncate on-off='on' probability='0.9' peek-one-in='5' symbol='20'/>
<sample on-off='on' probability='0.8' grab-one-in='5' passthrough='no'
passthrough-symbol='0'/>
</black>
</regions>
If you are running the new SNF and you haven't checked your GBUdb
range settings in a while this might be a good time to make some
adjustments ;-) Some of the settings in previous releases were less
conservative and some were less aggressive -- all were backed by less
experience (of course).
The settings shown above are likely to become the default settings for
the production release, however we will continue to refine these
settings through our research prior to (and following) the production
release (planned in Q1).
Best,
_M
--
Pete McNeil
Chief Scientist,
Arm Research Labs, LLC.
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