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..::lib::Smokeping::matchers::ExpLoSmoke::lib::Smokeping::matchers::ExpLoss(3)

NAME
       Smokeping::matchers::ExpLoss - exponential weighting matcher for	packet
       loss with RMON-like thresholds

DESCRIPTION
       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>])

       Arguments:
	hist	- number of samples to weight against; weight will be disposed
       with
		  exponetial decreasing	manner from newest to oldest, so that
       the
		  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"
       alerts.
	fast	- use <fast> samples for fast transition: if the values	of
       last <fast>
		  samples more then <rising> - take "match" state, if less
       then
		  <falling> - take "no match" state.

       Note:
	If the actual history is less then <hist> value	then this value	is
       taken
	as the actual history.

COPYRIGHT
       Copyright (c) 2008 Veniamin Konoplev

       Developed in cooperation	with EU	EGEE project

LICENSE
       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.

AUTHOR
       Veniamin	Konoplev <vkonoplev@acm.org>

2.6.11				  2011..::lib::Smokeping::matchers::ExpLoss(3)

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