1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0
3 #
4 # Script for max single flow performance
5 # - If correctly tuned[1], single CPU 10G wirespeed small pkts is possible[2]
6 #
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]
13 #
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.
17 #
18 # Tuning see:
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
21 #
22 basedir=`dirname $0`
23 source ${basedir}/functions.sh
24 root_check_run_with_sudo "$@"
25
26 # Parameter parsing via include
27 source ${basedir}/parameters.sh
28
29 # Trap EXIT first
30 trap_exit
31
32 # Set some default params, if they didn't get set
33 if [ -z "$DEST_IP" ]; then
34 [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
35 fi
36 [ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
37 [ -z "$BURST" ] && BURST=32
38 [ -z "$CLONE_SKB" ] && CLONE_SKB="0" # No need for clones when bursting
39 [ -z "$COUNT" ] && COUNT="0" # Zero means indefinitely
40 if [ -n "$DEST_IP" ]; then
41 validate_addr${IP6} $DEST_IP
42 read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP)
43 fi
44 if [ -n "$DST_PORT" ]; then
45 read -r UDP_DST_MIN UDP_DST_MAX <<< $(parse_ports $DST_PORT)
46 validate_ports $UDP_DST_MIN $UDP_DST_MAX
47 fi
48
49 # General cleanup everything since last run
50 [ -z "$APPEND" ] && pg_ctrl "reset"
51
52 # Threads are specified with parameter -t value in $THREADS
53 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
54 dev=${DEV}@${thread}
55
56 # Add remove all other devices and add_device $dev to thread
57 [ -z "$APPEND" ] && pg_thread $thread "rem_device_all"
58 pg_thread $thread "add_device" $dev
59
60 # Base config
61 pg_set $dev "flag QUEUE_MAP_CPU"
62 pg_set $dev "count $COUNT"
63 pg_set $dev "clone_skb $CLONE_SKB"
64 pg_set $dev "pkt_size $PKT_SIZE"
65 pg_set $dev "delay $DELAY"
66 pg_set $dev "flag NO_TIMESTAMP"
67
68 # Destination
69 pg_set $dev "dst_mac $DST_MAC"
70 pg_set $dev "dst${IP6}_min $DST_MIN"
71 pg_set $dev "dst${IP6}_max $DST_MAX"
72
73 if [ -n "$DST_PORT" ]; then
74 # Single destination port or random port range
75 pg_set $dev "flag UDPDST_RND"
76 pg_set $dev "udp_dst_min $UDP_DST_MIN"
77 pg_set $dev "udp_dst_max $UDP_DST_MAX"
78 fi
79
80 [ ! -z "$UDP_CSUM" ] && pg_set $dev "flag UDPCSUM"
81
82 # Setup burst, for easy testing -b 0 disable bursting
83 # (internally in pktgen default and minimum burst=1)
84 if [[ ${BURST} -ne 0 ]]; then
85 pg_set $dev "burst $BURST"
86 else
87 info "$dev: Not using burst"
88 fi
89 done
90
91 # Run if user hits control-c
92 function print_result() {
93 # Print results
94 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
95 dev=${DEV}@${thread}
96 echo "Device: $dev"
97 cat /proc/net/pktgen/$dev | grep -A2 "Result:"
98 done
99 }
100 # trap keyboard interrupt (Ctrl-C)
101 trap true SIGINT
102
103 if [ -z "$APPEND" ]; then
104 echo "Running... ctrl^C to stop" >&2
105 pg_ctrl "start"
106
107 print_result
108 else
109 echo "Append mode: config done. Do more or use 'pg_ctrl start' to run"
110 fi
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