2023-08-30 17:31:07 +02:00
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#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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#
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# Script for max single flow performance
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# - If correctly tuned[1], single CPU 10G wirespeed small pkts is possible[2]
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#
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# Using pktgen "burst" option (use -b $N)
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# - To boost max performance
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# - Avail since: kernel v3.18
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# * commit 38b2cf2982dc73 ("net: pktgen: packet bursting via skb->xmit_more")
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# - This avoids writing the HW tailptr on every driver xmit
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# - The performance boost is impressive, see commit and blog [2]
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#
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# Notice: On purpose generates a single (UDP) flow towards target,
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# reason behind this is to only overload/activate a single CPU on
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# target host. And no randomness for pktgen also makes it faster.
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#
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# Tuning see:
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# [1] http://netoptimizer.blogspot.dk/2014/06/pktgen-for-network-overload-testing.html
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# [2] http://netoptimizer.blogspot.dk/2014/10/unlocked-10gbps-tx-wirespeed-smallest.html
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#
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basedir=`dirname $0`
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source ${basedir}/functions.sh
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root_check_run_with_sudo "$@"
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# Parameter parsing via include
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source ${basedir}/parameters.sh
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2023-10-24 12:59:35 +02:00
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# Trap EXIT first
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trap_exit
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2023-08-30 17:31:07 +02:00
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# Set some default params, if they didn't get set
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if [ -z "$DEST_IP" ]; then
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[ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
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fi
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[ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
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[ -z "$BURST" ] && BURST=32
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[ -z "$CLONE_SKB" ] && CLONE_SKB="0" # No need for clones when bursting
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[ -z "$COUNT" ] && COUNT="0" # Zero means indefinitely
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if [ -n "$DEST_IP" ]; then
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validate_addr${IP6} $DEST_IP
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read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP)
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fi
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if [ -n "$DST_PORT" ]; then
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read -r UDP_DST_MIN UDP_DST_MAX <<< $(parse_ports $DST_PORT)
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validate_ports $UDP_DST_MIN $UDP_DST_MAX
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fi
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# General cleanup everything since last run
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[ -z "$APPEND" ] && pg_ctrl "reset"
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# Threads are specified with parameter -t value in $THREADS
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for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
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dev=${DEV}@${thread}
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# Add remove all other devices and add_device $dev to thread
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[ -z "$APPEND" ] && pg_thread $thread "rem_device_all"
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pg_thread $thread "add_device" $dev
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# Base config
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pg_set $dev "flag QUEUE_MAP_CPU"
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pg_set $dev "count $COUNT"
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pg_set $dev "clone_skb $CLONE_SKB"
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pg_set $dev "pkt_size $PKT_SIZE"
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pg_set $dev "delay $DELAY"
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pg_set $dev "flag NO_TIMESTAMP"
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# Destination
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pg_set $dev "dst_mac $DST_MAC"
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pg_set $dev "dst${IP6}_min $DST_MIN"
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pg_set $dev "dst${IP6}_max $DST_MAX"
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if [ -n "$DST_PORT" ]; then
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# Single destination port or random port range
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pg_set $dev "flag UDPDST_RND"
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pg_set $dev "udp_dst_min $UDP_DST_MIN"
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pg_set $dev "udp_dst_max $UDP_DST_MAX"
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fi
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[ ! -z "$UDP_CSUM" ] && pg_set $dev "flag UDPCSUM"
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# Setup burst, for easy testing -b 0 disable bursting
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# (internally in pktgen default and minimum burst=1)
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if [[ ${BURST} -ne 0 ]]; then
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pg_set $dev "burst $BURST"
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else
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info "$dev: Not using burst"
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fi
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done
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# Run if user hits control-c
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function print_result() {
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# Print results
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for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
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dev=${DEV}@${thread}
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echo "Device: $dev"
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cat /proc/net/pktgen/$dev | grep -A2 "Result:"
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done
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}
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# trap keyboard interrupt (Ctrl-C)
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trap true SIGINT
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if [ -z "$APPEND" ]; then
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echo "Running... ctrl^C to stop" >&2
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pg_ctrl "start"
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print_result
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else
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echo "Append mode: config done. Do more or use 'pg_ctrl start' to run"
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fi
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