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[ns] about queue size



hi, ns users
I must measure queue size at each time.
so, I used queue monitor as follow
 
# trace queue size
set qmon [$ns monitor-queue $bs $rcv_node $dropq_]
$qmon trace $dropq_
 
queue limit is 50
but I get above 50 value.--;;;
here is output file
 
q -t 37.7593404177031 -s 0 -d 0 -l 77380 -p 53
q -t 37.7593920689823 -s 0 -d 0 -l 75920 -p 52
q -t 37.7650791402455 -s 0 -d 0 -l 77380 -p 53
q -t 37.7652320689823 -s 0 -d 0 -l 75920 -p 52
q -t 37.7709719299428 -s 0 -d 0 -l 77380 -p 53
q -t 37.7710720689823 -s 0 -d 0 -l 75920 -p 52
q -t 37.7767713425638 -s 0 -d 0 -l 77380 -p 53
q -t 37.7769120689823 -s 0 -d 0 -l 75920 -p 52
q -t 37.7826769390889 -s 0 -d 0 -l 77380 -p 53
q -t 37.7827520689823 -s 0 -d 0 -l 75920 -p 52
q -t 37.7884830585967 -s 0 -d 0 -l 77380 -p 53
q -t 37.7885920689823 -s 0 -d 0 -l 75920 -p 52
 
also, last queue size that I get in this file is no 0 . --;;
 
my code have some problem??