samples/pktgen/pktgen_sample03_burst_single_flow.sh

   1 #!/bin/bash
   2 #
   3 # Script for max single flow performance
   4 #  - If correctly tuned[1], single CPU 10G wirespeed small pkts is possible[2]
   5 #
   6 # Using pktgen "burst" option (use -b $N)
   7 #  - To boost max performance
   8 #  - Avail since: kernel v3.18
   9 #   * commit 38b2cf2982dc73 ("net: pktgen: packet bursting via skb->xmit_more")
  10 #  - This avoids writing the HW tailptr on every driver xmit
  11 #  - The performance boost is impressive, see commit and blog [2]
  12 #
  13 # Notice: On purpose generates a single (UDP) flow towards target,
  14 #   reason behind this is to only overload/activate a single CPU on
  15 #   target host.  And no randomness for pktgen also makes it faster.
  16 #
  17 # Tuning see:
  18 #  [1] http://netoptimizer.blogspot.dk/2014/06/pktgen-for-network-overload-testing.html
  19 #  [2] http://netoptimizer.blogspot.dk/2014/10/unlocked-10gbps-tx-wirespeed-smallest.html
  20 #
  21 basedir=`dirname $0`
  22 source ${basedir}/functions.sh
  23 root_check_run_with_sudo "$@"
  24
  25 # Parameter parsing via include
  26 source ${basedir}/parameters.sh
  27 # Set some default params, if they didn't get set
  28 [ -z "$DEST_IP" ]   && DEST_IP="198.18.0.42"
  29 [ -z "$DST_MAC" ]   && DST_MAC="90:e2:ba:ff:ff:ff"
  30 [ -z "$BURST" ]     && BURST=32
  31 [ -z "$CLONE_SKB" ] && CLONE_SKB="100000"
  32
  33 # Base Config
  34 DELAY="0"  # Zero means max speed
  35 COUNT="0"  # Zero means indefinitely
  36
  37 # General cleanup everything since last run
  38 pg_ctrl "reset"
  39
  40 # Threads are specified with parameter -t value in $THREADS
  41 for ((thread = 0; thread < $THREADS; thread++)); do
  42     dev=${DEV}@${thread}
  43
  44     # Add remove all other devices and add_device $dev to thread
  45     pg_thread $thread "rem_device_all"
  46     pg_thread $thread "add_device" $dev
  47
  48     # Base config
  49     pg_set $dev "flag QUEUE_MAP_CPU"
  50     pg_set $dev "count $COUNT"
  51     pg_set $dev "clone_skb $CLONE_SKB"
  52     pg_set $dev "pkt_size $PKT_SIZE"
  53     pg_set $dev "delay $DELAY"
  54     pg_set $dev "flag NO_TIMESTAMP"
  55
  56     # Destination
  57     pg_set $dev "dst_mac $DST_MAC"
  58     pg_set $dev "dst $DEST_IP"
  59
  60     # Setup burst, for easy testing -b 0 disable bursting
  61     # (internally in pktgen default and minimum burst=1)
  62     if [[ ${BURST} -ne 0 ]]; then
  63         pg_set $dev "burst $BURST"
  64     else
  65         info "$dev: Not using burst"
  66     fi
  67 done
  68
  69 # Run if user hits control-c
  70 function control_c() {
  71     # Print results
  72     for ((thread = 0; thread < $THREADS; thread++)); do
  73         dev=${DEV}@${thread}
  74         echo "Device: $dev"
  75         cat /proc/net/pktgen/$dev | grep -A2 "Result:"
  76     done
  77 }
  78 # trap keyboard interrupt (Ctrl-C)
  79 trap control_c SIGINT
  80
  81 echo "Running... ctrl^C to stop" >&2
  82 pg_ctrl "start"