2 # SPDX-License-Identifier: GPL-2.0
4 # Script for max single flow performance
5 # - If correctly tuned[1], single CPU 10G wirespeed small pkts is possible[2]
7 # Using pktgen "burst" option (use -b $N)
8 # - To boost max performance
9 # - Avail since: kernel v3.18
10 # * commit 38b2cf2982dc73 ("net: pktgen: packet bursting via skb->xmit_more")
11 # - This avoids writing the HW tailptr on every driver xmit
12 # - The performance boost is impressive, see commit and blog [2]
14 # Notice: On purpose generates a single (UDP) flow towards target,
15 # reason behind this is to only overload/activate a single CPU on
16 # target host. And no randomness for pktgen also makes it faster.
19 # [1] http://netoptimizer.blogspot.dk/2014/06/pktgen-for-network-overload-testing.html
20 # [2] http://netoptimizer.blogspot.dk/2014/10/unlocked-10gbps-tx-wirespeed-smallest.html
23 source ${basedir}/functions.sh
24 root_check_run_with_sudo "$@"
26 # Parameter parsing via include
27 source ${basedir}/parameters.sh
28 # Set some default params, if they didn't get set
29 if [ -z "$DEST_IP" ]; then
30 [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
32 [ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
33 [ -z "$BURST" ] && BURST=32
34 [ -z "$CLONE_SKB" ] && CLONE_SKB="0" # No need for clones when bursting
35 [ -z "$COUNT" ] && COUNT="0" # Zero means indefinitely
36 if [ -n "$DEST_IP" ]; then
37 validate_addr${IP6} $DEST_IP
38 read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP)
40 if [ -n "$DST_PORT" ]; then
41 read -r UDP_DST_MIN UDP_DST_MAX <<< $(parse_ports $DST_PORT)
42 validate_ports $UDP_DST_MIN $UDP_DST_MAX
45 # General cleanup everything since last run
46 [ -z "$APPEND" ] && pg_ctrl "reset"
48 # Threads are specified with parameter -t value in $THREADS
49 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
52 # Add remove all other devices and add_device $dev to thread
53 [ -z "$APPEND" ] && pg_thread $thread "rem_device_all"
54 pg_thread $thread "add_device" $dev
57 pg_set $dev "flag QUEUE_MAP_CPU"
58 pg_set $dev "count $COUNT"
59 pg_set $dev "clone_skb $CLONE_SKB"
60 pg_set $dev "pkt_size $PKT_SIZE"
61 pg_set $dev "delay $DELAY"
62 pg_set $dev "flag NO_TIMESTAMP"
65 pg_set $dev "dst_mac $DST_MAC"
66 pg_set $dev "dst${IP6}_min $DST_MIN"
67 pg_set $dev "dst${IP6}_max $DST_MAX"
69 if [ -n "$DST_PORT" ]; then
70 # Single destination port or random port range
71 pg_set $dev "flag UDPDST_RND"
72 pg_set $dev "udp_dst_min $UDP_DST_MIN"
73 pg_set $dev "udp_dst_max $UDP_DST_MAX"
76 [ ! -z "$UDP_CSUM" ] && pg_set $dev "flag UDPCSUM"
78 # Setup burst, for easy testing -b 0 disable bursting
79 # (internally in pktgen default and minimum burst=1)
80 if [[ ${BURST} -ne 0 ]]; then
81 pg_set $dev "burst $BURST"
83 info "$dev: Not using burst"
87 # Run if user hits control-c
88 function print_result() {
90 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
93 cat /proc/net/pktgen/$dev | grep -A2 "Result:"
96 # trap keyboard interrupt (Ctrl-C)
99 if [ -z "$APPEND" ]; then
100 echo "Running... ctrl^C to stop" >&2
105 echo "Append mode: config done. Do more or use 'pg_ctrl start' to run"