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101 lines
3.1 KiB
101 lines
3.1 KiB
#!/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 ${basedir}/parameters.sh |
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# Set some default params, if they didn't get set |
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if [ -z "$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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# Base Config |
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DELAY="0" # Zero means max speed |
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# General cleanup everything since last run |
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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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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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# 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 control_c() { |
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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 control_c SIGINT |
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echo "Running... ctrl^C to stop" >&2 |
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pg_ctrl "start"
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