DragonFly On-Line Manual Pages
Smokeping::matchers::ExpLoss - exponential weighting matcher for packet
loss with RMON-like thresholds
Match against exponential weighted average of last samples, thus new
values are more valuable as old ones. Two thresholds - rising and
falling - produce hysteresis loop like in RMON alert subsystem. If the
average reaches the "rising" threshold, matcher go to the "match" state
and hold It until the average drops under the "falling" threshold.
Call the matcher with the following sequence:
type = matcher
pattern = CheckLoss(hist => <hist>, rising=><rising> \
[,falling => <falling>] [,skip=><stat>] [,fast=><fast>])
hist - number of samples to weight against; weight will be disposed
exponetial decreasing manner from newest to oldest, so that
oldest sample would have 1% significance;
rising - rising threshold for packet loss, 0-100%
falling - falling threshold for packet loss, default is <rising>
skip - skip <skip> number of samples after startup before "fire"
fast - use <fast> samples for fast transition: if the values of
samples more then <rising> - take "match" state, if less
<falling> - take "no match" state.
If the actual history is less then <hist> value then this value is
as the actual history.
Copyright (c) 2008 Veniamin Konoplev
Developed in cooperation with EU EGEE project
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
675 Mass Ave, Cambridge, MA 02139, USA.
Veniamin Konoplev <email@example.com>