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 107