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 ${basedir}/parameters.sh
  27 # Set some default params, if they didn't get set
  28 if [ -z "$DEST_IP" ]; then
  29     [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
  30 fi
  31 [ -z "$DST_MAC" ]   && DST_MAC="90:e2:ba:ff:ff:ff"
  32 [ -z "$BURST" ]     && BURST=32
  33 [ -z "$CLONE_SKB" ] && CLONE_SKB="100000"
  34
  35 # Base Config
  36 DELAY="0"  # Zero means max speed
  37 COUNT="0"  # Zero means indefinitely
  38
  39 # General cleanup everything since last run
  40 pg_ctrl "reset"
  41
  42 # Threads are specified with parameter -t value in $THREADS
  43 for ((thread = 0; thread < $THREADS; thread++)); do
  44     dev=${DEV}@${thread}
  45
  46     # Add remove all other devices and add_device $dev to thread
  47     pg_thread $thread "rem_device_all"
  48     pg_thread $thread "add_device" $dev
  49
  50     # Base config
  51     pg_set $dev "flag QUEUE_MAP_CPU"
  52     pg_set $dev "count $COUNT"
  53     pg_set $dev "clone_skb $CLONE_SKB"
  54     pg_set $dev "pkt_size $PKT_SIZE"
  55     pg_set $dev "delay $DELAY"
  56     pg_set $dev "flag NO_TIMESTAMP"
  57
  58     # Destination
  59     pg_set $dev "dst_mac $DST_MAC"
  60     pg_set $dev "dst$IP6 $DEST_IP"
  61
  62     # Setup burst, for easy testing -b 0 disable bursting
  63     # (internally in pktgen default and minimum burst=1)
  64     if [[ ${BURST} -ne 0 ]]; then
  65         pg_set $dev "burst $BURST"
  66     else
  67         info "$dev: Not using burst"
  68     fi
  69 done
  70
  71 # Run if user hits control-c
  72 function control_c() {
  73     # Print results
  74     for ((thread = 0; thread < $THREADS; thread++)); do
  75         dev=${DEV}@${thread}
  76         echo "Device: $dev"
  77         cat /proc/net/pktgen/$dev | grep -A2 "Result:"
  78     done
  79 }
  80 # trap keyboard interrupt (Ctrl-C)
  81 trap control_c SIGINT
  82
  83 echo "Running... ctrl^C to stop" >&2
  84 pg_ctrl "start"