# Configuration
LOG_PREFIX=/dev/shm/benchmark-log
SIZE=10000000
+
+# Network parameters
+# Some realistic values:
+# - Gbit LAN connection: RATE=1gbit DELAY=0.4ms JITTER=0.04ms LOSS=0%
+# - Fast WAN connection: RATE=100mbit DELAY=50ms JITTER=3ms LOSS=0%
+# - 5GHz WiFi connection: RATE=90mbit DELAY=5ms JITTER=1ms LOSS=0%
RATE=100mbit
DELAY=10ms
-JITTER=0ms
+JITTER=1ms
+LOSS=0.1%
+
+# Maximum achievable bandwidth is limited to BUFSIZE / (2 * DELAY)
+# The Linux kernel has a default maximum send buffer of 4 MiB
+#export BUFSIZE=4194304
# Require root permissions
if [ "$USER" != "root" ]; then
exec sudo "$0" "$@"
fi
+# Remove old log files
+rm -f $LOG_PREFIX-* 2>/dev/null
+
# Clean up old namespaces
ip link del utcp-left 2>/dev/null || true
ip link del utcp-right 2>/dev/null || true
ip netns exec utcp-left ip link set utcp-left up
#ip netns exec utcp-left tc qdisc del dev utcp-left root
-ip netns exec utcp-left tc qdisc add dev utcp-left root netem rate $RATE delay $DELAY $JITTER
+ip netns exec utcp-left tc qdisc add dev utcp-left root netem rate $RATE delay $DELAY $JITTER loss random $LOSS
# Set up the right namespace
ip netns add utcp-right
ip netns exec utcp-right ip link set utcp-right up
#ip netns exec utcp-right tc qdisc del dev utcp-right root
-ip netns exec utcp-right tc qdisc add dev utcp-right root netem rate $RATE delay $DELAY $JITTER
-
+ip netns exec utcp-right tc qdisc add dev utcp-right root netem rate $RATE delay $DELAY $JITTER loss random $LOSS
# Test using kernel TCP
ip netns exec utcp-right tcpdump -i utcp-right -w $LOG_PREFIX-socat.pcap port 9999 2>/dev/null &
ip netns exec utcp-left socat TCP4-LISTEN:9999 - >/dev/null &
echo
echo "UTCP:"
-tail -2 $LOG_PREFIX-client.txt
+tail -3 $LOG_PREFIX-client.txt
# If sudo was used, ensure the log files can be read by the user
if [ -n "$SUDO_USER" ]; then