4 # Require root permissions
5 test "$(id -u)" = "0" || exit 77
8 LOG_PREFIX=/dev/shm/utcp-benchmark-log
12 # Some realistic values:
13 # - Gbit LAN connection: RATE=1gbit DELAY=0.4ms JITTER=0.04ms LOSS=0%
14 # - Fast WAN connection: RATE=100mbit DELAY=50ms JITTER=3ms LOSS=0%
15 # - 5GHz WiFi connection: RATE=90mbit DELAY=5ms JITTER=1ms LOSS=0%
21 # Maximum achievable bandwidth is limited to BUFSIZE / (2 * DELAY)
22 # The Linux kernel has a default maximum send buffer of 4 MiB
23 #export BUFSIZE=4194304
25 # Remove old log files
26 rm -f $LOG_PREFIX-* 2>/dev/null
28 # Clean up old namespaces
29 ip link del utcp-left 2>/dev/null || true
30 ip link del utcp-right 2>/dev/null || true
31 ip netns delete utcp-left 2>/dev/null || true
32 ip netns delete utcp-right 2>/dev/null || true
34 # Set up the left namespace
35 ip netns add utcp-left
36 ip link add name utcp-left type veth peer name utcp-right
37 ip link set utcp-left netns utcp-left
39 ip netns exec utcp-left ethtool -K utcp-left tso off
40 ip netns exec utcp-left ip link set dev lo up
41 ip netns exec utcp-left ip addr add dev utcp-left 192.168.1.1/24
42 ip netns exec utcp-left ip link set utcp-left up
44 #ip netns exec utcp-left tc qdisc del dev utcp-left root
45 ip netns exec utcp-left tc qdisc add dev utcp-left root netem rate $RATE delay $DELAY $JITTER loss random $LOSS
47 # Set up the right namespace
48 ip netns add utcp-right
49 ip link set utcp-right netns utcp-right
51 ip netns exec utcp-right ethtool -K utcp-right tso off
52 ip netns exec utcp-right ip link set dev lo up
53 ip netns exec utcp-right ip addr add dev utcp-right 192.168.1.2/24
54 ip netns exec utcp-right ip link set utcp-right up
56 #ip netns exec utcp-right tc qdisc del dev utcp-right root
57 ip netns exec utcp-right tc qdisc add dev utcp-right root netem rate $RATE delay $DELAY $JITTER loss random $LOSS
58 # Test using kernel TCP
59 ip netns exec utcp-right tcpdump -i utcp-right -w $LOG_PREFIX-socat.pcap port 9999 2>/dev/null &
60 ip netns exec utcp-left socat TCP4-LISTEN:9999 - >/dev/null &
62 head -c $SIZE /dev/zero | ip netns exec utcp-right time socat - TCP4:192.168.1.1:9999 2>$LOG_PREFIX-socat-client.txt >/dev/null
64 kill $(jobs -p) 2>/dev/null
67 ip netns exec utcp-right tcpdump -i utcp-right -w $LOG_PREFIX-utcp.pcap udp port 9999 2>/dev/null &
68 ip netns exec utcp-left ../src/utcp-test 9999 2>$LOG_PREFIX-server.txt >/dev/null &
70 head -c $SIZE /dev/zero | ip netns exec utcp-right time ../src/utcp-test 192.168.1.1 9999 2>$LOG_PREFIX-client.txt >/dev/null
72 kill $(jobs -p) 2>/dev/null
74 # Print timing statistics
76 tail -2 $LOG_PREFIX-socat-client.txt
80 tail -3 $LOG_PREFIX-client.txt