samples/pktgen/pktgen_sample03_burst_single_flow.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Script for max single flow performance
   5 #  - 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 performance
   9 #  - Avail since: kernel v3.18
  10 #   * commit 38b2cf2982dc73 ("net: pktgen: packet bursting via skb->xmit_more")
  11 #  - This avoids writing the HW tailptr on every driver xmit
  12 #  - 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 on
  16 #   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.html
  20 #  [2] http://netoptimizer.blogspot.dk/2014/10/unlocked-10gbps-tx-wirespeed-smallest.html
  21 #
  22 basedir=`dirname $0`
  23 source ${basedir}/functions.sh
  24 root_check_run_with_sudo "$@"
  25
  26 # Parameter parsing via include
  27 source ${basedir}/parameters.sh
  28 # Set some default params, if they didn't get set
  29 if [ -z "$DEST_IP" ]; then
  30     [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
  31 fi
  32 [ -z "$DST_MAC" ]   && DST_MAC="90:e2:ba:ff:ff:ff"
  33 [ -z "$BURST" ]     && BURST=32
  34 [ -z "$CLONE_SKB" ] && CLONE_SKB="0" # No need for clones when bursting
  35 [ -z "$COUNT" ]     && COUNT="0" # Zero means indefinitely
  36
  37 # Base Config
  38 DELAY="0"  # Zero means max speed
  39
  40 # General cleanup everything since last run
  41 pg_ctrl "reset"
  42
  43 # Threads are specified with parameter -t value in $THREADS
  44 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
  45     dev=${DEV}@${thread}
  46
  47     # Add remove all other devices and add_device $dev to thread
  48     pg_thread $thread "rem_device_all"
  49     pg_thread $thread "add_device" $dev
  50
  51     # Base config
  52     pg_set $dev "flag QUEUE_MAP_CPU"
  53     pg_set $dev "count $COUNT"
  54     pg_set $dev "clone_skb $CLONE_SKB"
  55     pg_set $dev "pkt_size $PKT_SIZE"
  56     pg_set $dev "delay $DELAY"
  57     pg_set $dev "flag NO_TIMESTAMP"
  58
  59     # Destination
  60     pg_set $dev "dst_mac $DST_MAC"
  61     pg_set $dev "dst$IP6 $DEST_IP"
  62
  63     # Setup burst, for easy testing -b 0 disable bursting
  64     # (internally in pktgen default and minimum burst=1)
  65     if [[ ${BURST} -ne 0 ]]; then
  66         pg_set $dev "burst $BURST"
  67     else
  68         info "$dev: Not using burst"
  69     fi
  70 done
  71
  72 # Run if user hits control-c
  73 function control_c() {
  74     # Print results
  75     for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
  76         dev=${DEV}@${thread}
  77         echo "Device: $dev"
  78         cat /proc/net/pktgen/$dev | grep -A2 "Result:"
  79     done
  80 }
  81 # trap keyboard interrupt (Ctrl-C)
  82 trap control_c SIGINT
  83
  84 echo "Running... ctrl^C to stop" >&2
  85 pg_ctrl "start"