tcp-retransmissions

#!/bin/sh

# tcp_retries revision 2 (Feb 2012)
#
# TCP retransmission rate. Useful for network debugging.
#
# Required privileges: none
#
# OS: Linux with procfs
#
# Author: Artem Sheremet <dot.doom@gmail.com>
#

#%# family=auto
#%# capabilities=autoconf

TCPSTAT=/proc/net/tcp

case $1 in
	autoconf)
		[ -r $TCPSTAT -o -r ${TCPSTAT}6 ] && echo "yes" || echo "no"
		;;
    config)
		cat <<CONFIG
graph_title TCP retransmissions
graph_vlabel Rate, retrs/sockets
graph_category network
graph_info TCP sockets retransmission counters from $TCPSTAT
rate.label Retransmission rate
rate.draw LINE2
rate.min 0
CONFIG
		;;
esac

cat /proc/net/tcp* | awk '
{
	TOTAL += $7;
	COUNT++;
}

END {
	printf "rate.value %.3f\n", TOTAL/COUNT
}
'