Simplistic IPv4/IPv6 relative performance test

v6v4test_lacnic.sh

# uncomment to use google's test objects
# logfile="v6v4test_google.csv"
# w4url="https://random8168-v6exp3.v4.metric.gstatic.com/v6exp3/6.gif"
# w6url="https://random2385-v6exp3.ds.metric.gstatic.com/v6exp3/6.gif"

# uncomment to use lacnic's objects
logfile="v6v4test_lacnic.csv"
#w4url="http://w4.labs.lacnic.net/v6v4test/1000kb.bin"
w4url="http://200.7.84.10/v6v4test/1000kb.bin"
#w6url="http://w6.labs.lacnic.net/v6v4test/1000kb.bin"
w6url="http://[2001:13c7:7001:4000::10]/v6v4test/1000kb.bin" 

function perform_test() {
	date
	start=$(date +%s.%N)
	wget -q -4 --output-document=/dev/null $w4url
	durv4=$(echo "$(date +%s.%N) - $start" | bc)
	printf "Execution time v4: %.6f seconds\n" $durv4

	sleep $((1 + RANDOM % 10))

	start=$(date +%s.%N)
	wget -q -6 --output-document=/dev/null $w6url
	durv6=$(echo "$(date +%s.%N) - $start" | bc)
	printf "Execution time v6: %.6f seconds\n" $durv6

	dif=$(echo "($durv6 - $durv4)*1000" | bc)

	printf "%s | %.6f | %.6f | %.6f \n" "$(date)" $durv6 $durv4 $dif >> $logfile
	printf "Difference (negative values favor ipv6): %.6f miliseconds\n" $dif
	printf "\n"
}

# main loop
echo "Entering test loop, end with CTRL-C"
while true
do
	perform_test;
	sleep 30;
done

Simple IPv4/IPv6 relative performance test

This scripts downloads the same file over IPv4 and then over IPv6 and compares the time needed for each download.