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 ${basedir}/parameters.sh
  28
  29 # Trap EXIT first
  30 trap_exit
  31
  32 # Set some default params, if they didn't get set
  33 if [ -z "$DEST_IP" ]; then
  34     [ -z "$IP6" ] && DEST_IP="198.18.0.42" || DEST_IP="FD00::1"
  35 fi
  36 [ -z "$DST_MAC" ]   && DST_MAC="90:e2:ba:ff:ff:ff"
  37 [ -z "$BURST" ]     && BURST=32
  38 [ -z "$CLONE_SKB" ] && CLONE_SKB="0" # No need for clones when bursting
  39 [ -z "$COUNT" ]     && COUNT="0" # Zero means indefinitely
  40 if [ -n "$DEST_IP" ]; then
  41     validate_addr${IP6} $DEST_IP
  42     read -r DST_MIN DST_MAX <<< $(parse_addr${IP6} $DEST_IP)
  43 fi
  44 if [ -n "$DST_PORT" ]; then
  45     read -r UDP_DST_MIN UDP_DST_MAX <<< $(parse_ports $DST_PORT)
  46     validate_ports $UDP_DST_MIN $UDP_DST_MAX
  47 fi
  48
  49 # General cleanup everything since last run
  50 [ -z "$APPEND" ] && pg_ctrl "reset"
  51
  52 # Threads are specified with parameter -t value in $THREADS
  53 for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
  54     dev=${DEV}@${thread}
  55
  56     # Add remove all other devices and add_device $dev to thread
  57     [ -z "$APPEND" ] && pg_thread $thread "rem_device_all"
  58     pg_thread $thread "add_device" $dev
  59
  60     # Base config
  61     pg_set $dev "flag QUEUE_MAP_CPU"
  62     pg_set $dev "count $COUNT"
  63     pg_set $dev "clone_skb $CLONE_SKB"
  64     pg_set $dev "pkt_size $PKT_SIZE"
  65     pg_set $dev "delay $DELAY"
  66     pg_set $dev "flag NO_TIMESTAMP"
  67
  68     # Destination
  69     pg_set $dev "dst_mac $DST_MAC"
  70     pg_set $dev "dst${IP6}_min $DST_MIN"
  71     pg_set $dev "dst${IP6}_max $DST_MAX"
  72
  73     if [ -n "$DST_PORT" ]; then
  74         # Single destination port or random port range
  75         pg_set $dev "flag UDPDST_RND"
  76         pg_set $dev "udp_dst_min $UDP_DST_MIN"
  77         pg_set $dev "udp_dst_max $UDP_DST_MAX"
  78     fi
  79
  80     [ ! -z "$UDP_CSUM" ] && pg_set $dev "flag UDPCSUM"
  81
  82     # Setup burst, for easy testing -b 0 disable bursting
  83     # (internally in pktgen default and minimum burst=1)
  84     if [[ ${BURST} -ne 0 ]]; then
  85         pg_set $dev "burst $BURST"
  86     else
  87         info "$dev: Not using burst"
  88     fi
  89 done
  90
  91 # Run if user hits control-c
  92 function print_result() {
  93     # Print results
  94     for ((thread = $F_THREAD; thread <= $L_THREAD; thread++)); do
  95         dev=${DEV}@${thread}
  96         echo "Device: $dev"
  97         cat /proc/net/pktgen/$dev | grep -A2 "Result:"
  98     done
  99 }
 100 # trap keyboard interrupt (Ctrl-C)
 101 trap true SIGINT
 102
 103 if [ -z "$APPEND" ]; then
 104     echo "Running... ctrl^C to stop" >&2
 105     pg_ctrl "start"
 106
 107     print_result
 108 else
 109     echo "Append mode: config done. Do more or use 'pg_ctrl start' to run"
 110 fi