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# 21basedir=`dirname $0` 22source ${basedir}/functions.sh 23root_check_run_with_sudo "$@" 24 25# Parameter parsing via include 26source ${basedir}/parameters.sh 27# Set some default params, if they didn't get set 28[ -z "$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 34DELAY="0" # Zero means max speed 35COUNT="0" # Zero means indefinitely 36 37# General cleanup everything since last run 38pg_ctrl "reset" 39 40# Threads are specified with parameter -t value in $THREADS 41for ((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 67done 68 69# Run if user hits control-c 70function 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) 79trap control_c SIGINT 80 81echo "Running... ctrl^C to stop" >&2 82pg_ctrl "start" 83