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 "$COUNT" ] && COUNT="0" # Zero means indefinitely
36 if [ -n "$DST_PORT" ]; then
37 read -r DST_MIN DST_MAX <<< $(parse_ports $DST_PORT)
38 validate_ports $DST_MIN $DST_MAX
42 DELAY="0" # Zero means max speed
44 # General cleanup everything since last run
47 # Threads are specified with parameter -t value in $THREADS
48 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
51 # Add remove all other devices and add_device $dev to thread
52 pg_thread $thread "rem_device_all"
53 pg_thread $thread "add_device" $dev
56 pg_set $dev "flag QUEUE_MAP_CPU"
57 pg_set $dev "count $COUNT"
58 pg_set $dev "clone_skb $CLONE_SKB"
59 pg_set $dev "pkt_size $PKT_SIZE"
60 pg_set $dev "delay $DELAY"
61 pg_set $dev "flag NO_TIMESTAMP"
64 pg_set $dev "dst_mac $DST_MAC"
65 pg_set $dev "dst$IP6 $DEST_IP"
67 if [ -n "$DST_PORT" ]; then
68 # Single destination port or random port range
69 pg_set $dev "flag UDPDST_RND"
70 pg_set $dev "udp_dst_min $DST_MIN"
71 pg_set $dev "udp_dst_max $DST_MAX"
74 # Setup burst, for easy testing -b 0 disable bursting
75 # (internally in pktgen default and minimum burst=1)
76 if [[ ${BURST} -ne 0 ]]; then
77 pg_set $dev "burst $BURST"
79 info "$dev: Not using burst"
83 # Run if user hits control-c
84 function control_c() {
86 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
89 cat /proc/net/pktgen/$dev | grep -A2 "Result:"
92 # trap keyboard interrupt (Ctrl-C)
95 echo "Running... ctrl^C to stop" >&2