#!/bin/bash # SPDX-License-Identifier: GPL-2.0 # # Script for max single flow performance # - If correctly tuned[1], single CPU 10G wirespeed small pkts is possible[2] # # Using pktgen "burst" option (use -b $N) # - To boost max performance # - Avail since: kernel v3.18 # * commit 38b2cf2982dc73 ("net: pktgen: packet bursting via skb->xmit_more") # - This avoids writing the HW tailptr on every driver xmit # - The performance boost is impressive, see commit and blog [2] # # Notice: On purpose generates a single (UDP) flow towards target, # reason behind this is to only overload/activate a single CPU on # target host. And no randomness for pktgen also makes it faster. # # Tuning see: # [1] http://netoptimizer.blogspot.dk/2014/06/pktgen-for-network-overload-testing.html # [2] http://netoptimizer.blogspot.dk/2014/10/unlocked-10gbps-tx-wirespeed-smallest.html # basedir=`dirname $0` source ${basedir}/functions.sh root_check_run_with_sudo "$@" # Parameter parsing via include source ${basedir}/parameters.sh # Set some default params, if they didn't get set if [ -z "$DEST_IP" ]; then [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1" fi [ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff" [ -z "$BURST" ] && BURST=32 [ -z "$CLONE_SKB" ] && CLONE_SKB="100000" [ -z "$COUNT" ] && COUNT="0" # Zero means indefinitely # Base Config DELAY="0" # Zero means max speed # General cleanup everything since last run pg_ctrl "reset" # Threads are specified with parameter -t value in $THREADS for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do dev=${DEV}@${thread} # Add remove all other devices and add_device $dev to thread pg_thread $thread "rem_device_all" pg_thread $thread "add_device" $dev # Base config pg_set $dev "flag QUEUE_MAP_CPU" pg_set $dev "count $COUNT" pg_set $dev "clone_skb $CLONE_SKB" pg_set $dev "pkt_size $PKT_SIZE" pg_set $dev "delay $DELAY" pg_set $dev "flag NO_TIMESTAMP" # Destination pg_set $dev "dst_mac $DST_MAC" pg_set $dev "dst$IP6 $DEST_IP" # Setup burst, for easy testing -b 0 disable bursting # (internally in pktgen default and minimum burst=1) if [[ ${BURST} -ne 0 ]]; then pg_set $dev "burst $BURST" else info "$dev: Not using burst" fi done # Run if user hits control-c function control_c() { # Print results for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do dev=${DEV}@${thread} echo "Device: $dev" cat /proc/net/pktgen/$dev | grep -A2 "Result:" done } # trap keyboard interrupt (Ctrl-C) trap control_c SIGINT echo "Running... ctrl^C to stop" >&2 pg_ctrl "start"