| #!/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="0" # No need for clones when bursting |
| [ -z "$COUNT" ] && COUNT="0" # Zero means indefinitely |
| if [ -n "$DEST_IP" ]; then |
| validate_addr${IP6} $DEST_IP |
| read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP) |
| fi |
| if [ -n "$DST_PORT" ]; then |
| read -r UDP_DST_MIN UDP_DST_MAX <<< $(parse_ports $DST_PORT) |
| validate_ports $UDP_DST_MIN $UDP_DST_MAX |
| fi |
| |
| # General cleanup everything since last run |
| [ -z "$APPEND" ] && 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 $dev to thread |
| [ -z "$APPEND" ] && 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}_min $DST_MIN" |
| pg_set $dev "dst${IP6}_max $DST_MAX" |
| |
| if [ -n "$DST_PORT" ]; then |
| # Single destination port or random port range |
| pg_set $dev "flag UDPDST_RND" |
| pg_set $dev "udp_dst_min $UDP_DST_MIN" |
| pg_set $dev "udp_dst_max $UDP_DST_MAX" |
| fi |
| |
| [ ! -z "$UDP_CSUM" ] && pg_set $dev "flag UDPCSUM" |
| |
| # 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 |
| |
| if [ -z "$APPEND" ]; then |
| echo "Running... ctrl^C to stop" >&2 |
| pg_ctrl "start" |
| else |
| echo "Append mode: config done. Do more or use 'pg_ctrl start' to run" |
| fi |