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 36 37# Base Config 38DELAY="0" # Zero means max speed 39 40# General cleanup everything since last run 41pg_ctrl "reset" 42 43# Threads are specified with parameter -t value in $THREADS 44for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do 45 dev=${DEV}@${thread} 46 47 # Add remove all other devices and add_device $dev to thread 48 pg_thread $thread "rem_device_all" 49 pg_thread $thread "add_device" $dev 50 51 # Base config 52 pg_set $dev "flag QUEUE_MAP_CPU" 53 pg_set $dev "count $COUNT" 54 pg_set $dev "clone_skb $CLONE_SKB" 55 pg_set $dev "pkt_size $PKT_SIZE" 56 pg_set $dev "delay $DELAY" 57 pg_set $dev "flag NO_TIMESTAMP" 58 59 # Destination 60 pg_set $dev "dst_mac $DST_MAC" 61 pg_set $dev "dst$IP6 $DEST_IP" 62 63 # Setup burst, for easy testing -b 0 disable bursting 64 # (internally in pktgen default and minimum burst=1) 65 if [[ ${BURST} -ne 0 ]]; then 66 pg_set $dev "burst $BURST" 67 else 68 info "$dev: Not using burst" 69 fi 70done 71 72# Run if user hits control-c 73function control_c() { 74 # Print results 75 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do 76 dev=${DEV}@${thread} 77 echo "Device: $dev" 78 cat /proc/net/pktgen/$dev | grep -A2 "Result:" 79 done 80} 81# trap keyboard interrupt (Ctrl-C) 82trap control_c SIGINT 83 84echo "Running... ctrl^C to stop" >&2 85pg_ctrl "start" 86