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 ${basedir}/parameters.sh 28 29# Trap EXIT first 30trap_exit 31 32# Set some default params, if they didn't get set 33if [ -z "$DEST_IP" ]; then 34 [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1" 35fi 36[ -z "$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 "$COUNT" ] && COUNT="0" # Zero means indefinitely 40if [ -n "$DEST_IP" ]; then 41 validate_addr${IP6} $DEST_IP 42 read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP) 43fi 44if [ -n "$DST_PORT" ]; then 45 read -r UDP_DST_MIN UDP_DST_MAX <<< $(parse_ports $DST_PORT) 46 validate_ports $UDP_DST_MIN $UDP_DST_MAX 47fi 48 49# General cleanup everything since last run 50[ -z "$APPEND" ] && pg_ctrl "reset" 51 52# Threads are specified with parameter -t value in $THREADS 53for ((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 89done 90 91# Run if user hits control-c 92function 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) 101trap true SIGINT 102 103if [ -z "$APPEND" ]; then 104 echo "Running... ctrl^C to stop" >&2 105 pg_ctrl "start" 106 107 print_result 108else 109 echo "Append mode: config done. Do more or use 'pg_ctrl start' to run" 110fi 111