tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#
22basedir=`dirname $0`
23source ${basedir}/functions.sh
24root_check_run_with_sudo "$@"
25
26# Parameter parsing via include
27source ${basedir}/parameters.sh
28# Set some default params, if they didn't get set
29if [ -z "$DEST_IP" ]; then
30 [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
31fi
32[ -z "$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 "$COUNT" ] && COUNT="0" # Zero means indefinitely
36if [ -n "$DEST_IP" ]; then
37 validate_addr${IP6} $DEST_IP
38 read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP)
39fi
40if [ -n "$DST_PORT" ]; then
41 read -r UDP_DST_MIN UDP_DST_MAX <<< $(parse_ports $DST_PORT)
42 validate_ports $UDP_DST_MIN $UDP_DST_MAX
43fi
44
45# General cleanup everything since last run
46[ -z "$APPEND" ] && pg_ctrl "reset"
47
48# Threads are specified with parameter -t value in $THREADS
49for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
50 dev=${DEV}@${thread}
51
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
55
56 # Base config
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"
63
64 # Destination
65 pg_set $dev "dst_mac $DST_MAC"
66 pg_set $dev "dst${IP6}_min $DST_MIN"
67 pg_set $dev "dst${IP6}_max $DST_MAX"
68
69 if [ -n "$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 $UDP_DST_MAX"
74 fi
75
76 [ ! -z "$UDP_CSUM" ] && pg_set $dev "flag UDPCSUM"
77
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 $BURST"
82 else
83 info "$dev: Not using burst"
84 fi
85done
86
87# Run if user hits control-c
88function print_result() {
89 # Print results
90 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
91 dev=${DEV}@${thread}
92 echo "Device: $dev"
93 cat /proc/net/pktgen/$dev | grep -A2 "Result:"
94 done
95}
96# trap keyboard interrupt (Ctrl-C)
97trap true SIGINT
98
99if [ -z "$APPEND" ]; then
100 echo "Running... ctrl^C to stop" >&2
101 pg_ctrl "start"
102
103 print_result
104else
105 echo "Append mode: config done. Do more or use 'pg_ctrl start' to run"
106fi