projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1d73ba16 JDB |
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" |