flent-paper.batch

# -*- mode:conf -*-

# This is a fully functional example of a batch fild. It was used to perform the
# experiments in the paper describing Flent. The paper is called simply "Flent:
# The FLExible Network Tester". See https://www.cs.kau.se/tohojo/flent/ and
# http://urn.kb.se/resolve?urn=urn%3Anbn%3Ase%3Akau%3Adiva-64766
#
# The batch file is parsed as an ini file, and can have three types of sections:
# commands, batches and args. Each section also has a name. Type and name are
# separated with two colons.
#
# Sections of the same type can inherit from each other. Args are used for the
# loop facility (explained below). All variables are recursively substituted by
# using the ${varname} syntax. These three operations are resolved in this order
# (inheritance, arg interpolation and variable substitution).


# Setup command to be run before each test run. The script is simply:
### Start script setup_qdisc.sh
# #!/bin/sh
#
# set -o errexit
# set -o nounset
#
# IFACE=enp5s0
# QDISC=$1
# sudo ethtool -K $IFACE gso off tso off gro off
# sudo sysctl -w net.ipv4.tcp_no_metrics_save=1
# sudo tc qdisc replace dev $IFACE root $QDISC
### End script setup_qdisc.sh
#
# The user running Flent must have sufficient permissions to run the sudo
# commands specified, and the IFACE needs to be adjusted to match the system.

[Command::setup_qdisc]
exec = ./setup_qdisc.sh ${qdisc}
type = pre

# An essential pre command will cause the test to be aborted if it fails
# (returncode non-zero)
essential = yes


# A 'batch' is a named test to be run. It can specify normal Flent parameters as
# well as any other variables that can be used for substitution. When executing
# Flent in batch mode, -B specifies the batch file (this file), while -b
# specified which batch to run. The special argument ALL to -b will run all
# defined batches that are not set as inactive.
#
# Batches can inherit from each other, so it can be a good idea to have a
# 'global' batch that sets most parameters, and then override things in
# sub-batches.
[Batch::global]
# These are all Flent parameters that correspond to command line options.
extended_metadata = yes
socket_stats = yes
debug_error = yes
debug_log = yes
title = ${batch_title} qdisc:${qdisc} cc:${cc} rep:${repetition}
output_path = batch-${batch_time}-${batch_title}/${batch_name}
ip_version = 4
length = 140
hosts = netperf-eu.bufferbloat.net
test_parameters= tcp_cong_control=${cc};

# This is a special variable that specifies things to *append* to the filename
# Flent generates (based on time etc). The first part of the filename will be
# the same for every test in a batch, so the idea is to use this variable to
# disambiguate subsequent test runs (so putting 'repetition' in there is
# generally a good idea).
#
# The 'repetition' variable is another special variable that will get assigned
# the current repetition for each run.
filename_extra = ${qdisc}-${cc}-${repetition}

# These are the commands to run; must be specified as command type sections
# (i.e. this one corresponds to [Command::setup_qdisc] above).
commands = setup_qdisc

# This is a special variable that causes the test in the batch to be repeated
# this many times (setting the ${repetition} variable for each).
repetitions = 1

# Special variable - how long to pause after each test run before proceeding to
# the next one.
pause = 5

# Special variable. A batch can be disabled in two ways: Setting 'disabled=yes'
# which does what one would expect, and by setting 'abstract=yes'. The
# difference is that when another batch inherits from this one, the value of
# 'disabled' is inherited, while the value of 'abstract' isn't.
abstract = yes

# These are variables that are used for variable expansion in settings above.
# The idea is that other batches can override these to change part of the
# configuration.
batch_title = untitled
qdisc = fq

# This is the loop mechanism of the batch facility. Each variable that starts
# with for_ defines a loop (Flent doesn't care about the part after for_, but
# they matter when inheriting). The batch will then be repeated for each of the
# values of this variable. Each value must be defined in the batch file as a
# heading of type [Arg::name]. The variables in each [Arg] section will then be
# applied on top of the batch containing the loop before the test run
# corresponding to that arg.
#
# When multiple for_ statements are present, the cross product of all of them
# will be run. Likewise with repetitions (each arg will be repeated as many
# times as specified).
#
# The example here is used to repeat each test run with different congestion
# control algorithms.
for_cc = cubic, cubic_nopacing, bbr


# These are the actual batches that will be run. Each of them just inherits from
# 'global' and overrides some variables.
[Batch::tcp-upload]
inherits = global
test_name = tcp_1up_noping
disabled = no

[Batch::rrul]
inherits = global
test_name = rrul
disabled = no


# These are the args used for loops in the batches specified above. The arg name
# (the part after ::) is what is put into the for_ variables. Args can inherit
# from each other just like batches (but none of these do). In that case, arg
# inheritance is performed before the values are interpolated onto the batch.
#
# These args all just set a single variable (which is then used in the commands
# defined at the top of the file).

[Arg::cubic_nopacing]
cc = cubic
# The fq_codel qdisc doesn't do pacing for CUBIC
qdisc = fq_codel
# This host does not run sch_fq either
hosts = vlan820-28.cs.kau.se

[Arg::cubic]
cc = cubic

[Arg::bbr]
cc = bbr