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1d73ba16 JDB |
1 | #!/bin/bash |
2 | # | |
3 | # Script for max single flow performance | |
4 | # - If correctly tuned[1], single CPU 10G wirespeed small pkts is possible[2] | |
5 | # | |
6 | # Using pktgen "burst" option (use -b $N) | |
7 | # - To boost max performance | |
8 | # - Avail since: kernel v3.18 | |
9 | # * commit 38b2cf2982dc73 ("net: pktgen: packet bursting via skb->xmit_more") | |
10 | # - This avoids writing the HW tailptr on every driver xmit | |
11 | # - The performance boost is impressive, see commit and blog [2] | |
12 | # | |
13 | # Notice: On purpose generates a single (UDP) flow towards target, | |
14 | # reason behind this is to only overload/activate a single CPU on | |
15 | # target host. And no randomness for pktgen also makes it faster. | |
16 | # | |
17 | # Tuning see: | |
18 | # [1] http://netoptimizer.blogspot.dk/2014/06/pktgen-for-network-overload-testing.html | |
19 | # [2] http://netoptimizer.blogspot.dk/2014/10/unlocked-10gbps-tx-wirespeed-smallest.html | |
20 | # | |
21 | basedir=`dirname $0` | |
22 | source ${basedir}/functions.sh | |
23 | root_check_run_with_sudo "$@" | |
24 | ||
25 | # Parameter parsing via include | |
26 | source ${basedir}/parameters.sh | |
27 | # Set some default params, if they didn't get set | |
28 | [ -z "$DEST_IP" ] && DEST_IP="198.18.0.42" | |
29 | [ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff" | |
30 | [ -z "$BURST" ] && BURST=32 | |
31 | [ -z "$CLONE_SKB" ] && CLONE_SKB="100000" | |
32 | ||
33 | # Base Config | |
34 | DELAY="0" # Zero means max speed | |
35 | COUNT="0" # Zero means indefinitely | |
36 | ||
37 | # General cleanup everything since last run | |
38 | pg_ctrl "reset" | |
39 | ||
40 | # Threads are specified with parameter -t value in $THREADS | |
41 | for ((thread = 0; thread < $THREADS; thread++)); do | |
42 | dev=${DEV}@${thread} | |
43 | ||
44 | # Add remove all other devices and add_device $dev to thread | |
45 | pg_thread $thread "rem_device_all" | |
46 | pg_thread $thread "add_device" $dev | |
47 | ||
48 | # Base config | |
49 | pg_set $dev "flag QUEUE_MAP_CPU" | |
50 | pg_set $dev "count $COUNT" | |
51 | pg_set $dev "clone_skb $CLONE_SKB" | |
52 | pg_set $dev "pkt_size $PKT_SIZE" | |
53 | pg_set $dev "delay $DELAY" | |
54 | pg_set $dev "flag NO_TIMESTAMP" | |
55 | ||
56 | # Destination | |
57 | pg_set $dev "dst_mac $DST_MAC" | |
58 | pg_set $dev "dst $DEST_IP" | |
59 | ||
60 | # Setup burst, for easy testing -b 0 disable bursting | |
61 | # (internally in pktgen default and minimum burst=1) | |
62 | if [[ ${BURST} -ne 0 ]]; then | |
63 | pg_set $dev "burst $BURST" | |
64 | else | |
65 | info "$dev: Not using burst" | |
66 | fi | |
67 | done | |
68 | ||
69 | # Run if user hits control-c | |
70 | function control_c() { | |
71 | # Print results | |
72 | for ((thread = 0; thread < $THREADS; thread++)); do | |
73 | dev=${DEV}@${thread} | |
74 | echo "Device: $dev" | |
75 | cat /proc/net/pktgen/$dev | grep -A2 "Result:" | |
76 | done | |
77 | } | |
78 | # trap keyboard interrupt (Ctrl-C) | |
79 | trap control_c SIGINT | |
80 | ||
81 | echo "Running... ctrl^C to stop" >&2 | |
82 | pg_ctrl "start" |