111 lines · bash
1#!/bin/bash2# SPDX-License-Identifier: GPL-2.03#4# Script for max single flow performance5# - 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 performance9# - Avail since: kernel v3.1810# * commit 38b2cf2982dc73 ("net: pktgen: packet bursting via skb->xmit_more")11# - This avoids writing the HW tailptr on every driver xmit12# - 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 on16# 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.html20# [2] http://netoptimizer.blogspot.dk/2014/10/unlocked-10gbps-tx-wirespeed-smallest.html21#22basedir=`dirname $0`23source ${basedir}/functions.sh24root_check_run_with_sudo "$@"25 26# Parameter parsing via include27source ${basedir}/parameters.sh28 29# Trap EXIT first30trap_exit31 32# Set some default params, if they didn't get set33if [ -z "$DEST_IP" ]; then34 [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"35fi36[ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"37[ -z "$BURST" ] && BURST=3238[ -z "$CLONE_SKB" ] && CLONE_SKB="0" # No need for clones when bursting39[ -z "$COUNT" ] && COUNT="0" # Zero means indefinitely40if [ -n "$DEST_IP" ]; then41 validate_addr${IP6} $DEST_IP42 read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP)43fi44if [ -n "$DST_PORT" ]; then45 read -r UDP_DST_MIN UDP_DST_MAX <<< $(parse_ports $DST_PORT)46 validate_ports $UDP_DST_MIN $UDP_DST_MAX47fi48 49# General cleanup everything since last run50[ -z "$APPEND" ] && pg_ctrl "reset"51 52# Threads are specified with parameter -t value in $THREADS53for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do54 dev=${DEV}@${thread}55 56 # Add remove all other devices and add_device $dev to thread57 [ -z "$APPEND" ] && pg_thread $thread "rem_device_all"58 pg_thread $thread "add_device" $dev59 60 # Base config61 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 # Destination69 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" ]; then74 # Single destination port or random port range75 pg_set $dev "flag UDPDST_RND"76 pg_set $dev "udp_dst_min $UDP_DST_MIN"77 pg_set $dev "udp_dst_max $UDP_DST_MAX"78 fi79 80 [ ! -z "$UDP_CSUM" ] && pg_set $dev "flag UDPCSUM"81 82 # Setup burst, for easy testing -b 0 disable bursting83 # (internally in pktgen default and minimum burst=1)84 if [[ ${BURST} -ne 0 ]]; then85 pg_set $dev "burst $BURST"86 else87 info "$dev: Not using burst"88 fi89done90 91# Run if user hits control-c92function print_result() {93 # Print results94 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do95 dev=${DEV}@${thread}96 echo "Device: $dev"97 cat /proc/net/pktgen/$dev | grep -A2 "Result:"98 done99}100# trap keyboard interrupt (Ctrl-C)101trap true SIGINT102 103if [ -z "$APPEND" ]; then104 echo "Running... ctrl^C to stop" >&2105 pg_ctrl "start"106 107 print_result108else109 echo "Append mode: config done. Do more or use 'pg_ctrl start' to run"110fi111