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#!/bin/bash
#
# Benchmark script:
# - developed for benchmarking ingress qdisc path
#
# Script for injecting packets into RX path of the stack with pktgen
# "xmit_mode netif_receive". With an invalid dst_mac this will only
# measure the ingress code path as packets gets dropped in ip_rcv().
#
# This script don't really need any hardware. It benchmarks software
# RX path just after NIC driver level. With bursting is also
# "removes" the SKB alloc/free overhead.
#
# Setup scenarios for measuring ingress qdisc (with invalid dst_mac):
# ------------------------------------------------------------------
# (1) no ingress (uses static_key_false(&ingress_needed))
#
# (2) ingress on other dev (change ingress_needed and calls
# handle_ing() but exit early)
#
# config: tc qdisc add dev $SOMEDEV handle ffff: ingress
#
# (3) ingress on this dev, handle_ing() -> tc_classify()
#
# config: tc qdisc add dev $DEV handle ffff: ingress
#
# (4) ingress on this dev + drop at u32 classifier/action.
#
basedir=`dirname $0`
source ${basedir}/functions.sh
root_check_run_with_sudo "$@"
# Parameter parsing via include
source ${basedir}/parameters.sh
# Using invalid DST_MAC will cause the packets to get dropped in
# ip_rcv() which is part of the test
[ -z "$DEST_IP" ] && DEST_IP="198.18.0.42"
[ -z "$DST_MAC" ] && DST_MAC="90:e2:ba:ff:ff:ff"
[ -z "$BURST" ] && BURST=1024
# Base Config
DELAY="0" # Zero means max speed
COUNT="10000000" # Zero means indefinitely
# General cleanup everything since last run
pg_ctrl "reset"
# Threads are specified with parameter -t value in $THREADS
for ((thread = 0; thread < $THREADS; thread++)); do
# The device name is extended with @name, using thread number to
# make then unique, but any name will do.
dev=${DEV}@${thread}
# Add remove all other devices and add_device $dev to thread
pg_thread $thread "rem_device_all"
pg_thread $thread "add_device" $dev
# Base config of dev
pg_set $dev "flag QUEUE_MAP_CPU"
pg_set $dev "count $COUNT"
pg_set $dev "pkt_size $PKT_SIZE"
pg_set $dev "delay $DELAY"
pg_set $dev "flag NO_TIMESTAMP"
# Destination
pg_set $dev "dst_mac $DST_MAC"
pg_set $dev "dst $DEST_IP"
# Inject packet into RX path of stack
pg_set $dev "xmit_mode netif_receive"
# Burst allow us to avoid measuring SKB alloc/free overhead
pg_set $dev "burst $BURST"
done
# start_run
echo "Running... ctrl^C to stop" >&2
pg_ctrl "start"
echo "Done" >&2
# Print results
for ((thread = 0; thread < $THREADS; thread++)); do
dev=${DEV}@${thread}
echo "Device: $dev"
cat /proc/net/pktgen/$dev | grep -A2 "Result:"
done
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