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pktgen: add benchmark script pktgen_bench_xmit_mode_netif_receive.sh

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This script pktgen_bench_xmit_mode_netif_receive.sh is a benchmark
script, which can be used for benchmarking part of the network stack.
This can be used for performance improving or catching regression in
that area.

The script is developed for benchmarking ingress qdisc path, original
idea by Alexei Starovoitov.  This script don't really need any
hardware.  This is achieved via the recently introduced stack inject
feature "xmit_mode netif_receive". See commit 62f64aed62 ("pktgen:
introduce xmit_mode '<start_xmit|netif_receive>'").

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer 2015-05-21 12:18:29 +02:00 committed by David S. Miller
parent 1d73ba16ad
commit 05a14d5e17
1 changed files with 86 additions and 0 deletions
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86
samples/pktgen/pktgen_bench_xmit_mode_netif_receive.sh Executable file
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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