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Versions: 00 01 02

BMWG                                                        R. Rosa, Ed.
Internet-Draft                                             C. Rothenberg
Intended status: Informational                                   UNICAMP
Expires: January 3, 2019                                      M. Peuster
                                                                 H. Karl
                                                                     UPB
                                                            July 2, 2018


              Methodology for VNF Benchmarking Automation
                      draft-rosa-bmwg-vnfbench-02

Abstract

   This document describes a common methodology for automated
   benchmarking of Virtualized Network Functions (VNFs) executed on
   general-purpose hardware.  Specific cases of benchmarking
   methodologies for particular VNFs can be derived from this document.
   Two open source reference implementations are reported as running
   code embodiments of the proposed, automated benchmarking methodology.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 3, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect



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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Considerations  . . . . . . . . . . . . . . . . . . . . . . .   4
   4.1.  VNF Testing Methods . . . . . . . . . . . . . . . . . . . .   4
   4.2.  Generic VNF Benchmarking Setup  . . . . . . . . . . . . . .   5
   4.3.  Deployment Scenarios  . . . . . . . . . . . . . . . . . . .   7
   4.4.  Influencing Aspects . . . . . . . . . . . . . . . . . . . .   8
   5.  Methodology . . . . . . . . . . . . . . . . . . . . . . . . .   9
   5.1.  VNF Benchmarking Descriptor (VNF-BD)  . . . . . . . . . . .  10
   5.1.1.  Procedures Configuration  . . . . . . . . . . . . . . . .  10
   5.1.2.  Target Information  . . . . . . . . . . . . . . . . . . .  10
   5.1.3.  Deployment Scenario . . . . . . . . . . . . . . . . . . .  10
   5.2.  VNF Performance Profile (VNF-PP)  . . . . . . . . . . . . .  11
   5.2.1.  Execution Environment . . . . . . . . . . . . . . . . . .  12
   5.2.2.  Measurement Results . . . . . . . . . . . . . . . . . . .  12
   5.3.  Automated Benchmarking Procedures . . . . . . . . . . . . .  13
   5.4.  Particular Cases  . . . . . . . . . . . . . . . . . . . . .  15
   6.  Open Source Reference Implementations . . . . . . . . . . . .  16
   6.1.  Gym . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
   6.2.  tng-bench . . . . . . . . . . . . . . . . . . . . . . . . .  17
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  18
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  18
   9.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  18
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
   10.1.  Normative References . . . . . . . . . . . . . . . . . . .  18
   10.2.  Informative References . . . . . . . . . . . . . . . . . .  19
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

1.  Introduction

   Benchmarking Methodology Working Group (BMWG) initiated efforts,
   approaching considerations in [RFC8172], to develop methodologies for
   benchmarking VNFs.  Similarly described in [RFC8172], VNF benchmark
   motivating aspects define: (i) pre-deployment infrastructure
   dimensioning to realize associated VNF performance profiles; (ii)
   comparison factor with physical network functions; (iii) and output
   results for analytical VNF development.

   Having no strict and clear execution boundaries, different from
   earlier self-contained black-box benchmarking methodologies described



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   in BMWG, a VNF depends on underlying virtualized environment
   parameters [ETS14a], intrinsic factors to be analyzed when one
   investivages the performance of a VNF.  This document stands as a
   ground methodology guide for VNF benchmarking automation.  It
   addresses the state-of-the-art publications and the current
   developments in similar standardization efforts (e.g., [ETS14c] and
   [RFC8204]) towards bechmarking VNFs.

   Automating the extraction of VNF performance metrics propitiates: (i)
   the development of agile performance-focused DevOps methodologies for
   Continuous Integration and Delivery (CI/CD) of VNFs; (ii) the
   creation of on-demand VNF test descriptors for upcoming execution
   environments; (iii) the path for precise-analytics of extensively
   automated catalogues of VNF performance profiles; (iv) and run-time
   profiling mechanisms to assist VNF lifecycle orchestration/management
   workflows.

2.  Terminology

   Common benchmarking terminology contained in this document is derived
   from [RFC1242].  Also, the reader is assumed to be familiar with the
   terminology as defined in the European Telecommunications Standards
   Institute (ETSI) NFV document [ETS14b].  Some of these terms, and
   others commonly used in this document, are defined below.

   NFV:  Network Function Virtualization - The principle of separating
      network functions from the hardware they run on by using virtual
      hardware abstraction.

   NFVI PoP:  NFV Infrastructure Point of Presence - Any combination of
      virtualized compute, storage and network resources.

   NFVI:  NFV Infrastructure - Collection of NFVI PoPs under one
      orchestrator.

   VIM:  Virtualized Infrastructure Manager - functional block that is
      responsible for controlling and managing the NFVI compute, storage
      and network resources, usually within one operator's
      Infrastructure Domain (e.g.  NFVI-PoP).

   VNFM:  Virtualized Network Function Manager - functional block that
      is responsible for controlling and managing the VNF life-cycle.

   NFVO:  NFV Orchestrator - functional block that manages the Network
      Service (NS) life-cycle and coordinates the management of NS life-
      cycle, VNF life-cycle (supported by the VNFM) and NFVI resources
      (supported by the VIM) to ensure an optimized allocation of the
      necessary resources and connectivity.



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   VNF:  Virtualized Network Function - a software-based network
      function.  A VNF can be either represented by a single entity or
      be composed by a set of smaller, interconnected software
      components, called VNF components (VNFCs) [ETS14d].  Those VNFs
      are also called composed VNFs.

   VNFD:  Virtualised Network Function Descriptor - configuration
      template that describes a VNF in terms of its deployment and
      operational behaviour, and is used in the process of VNF on-
      boarding and managing the life cycle of a VNF instance.

   VNFC:  Virtualized Network Function Component - a software component
      that implements (parts of) the VNF functionality.  A VNF can
      consist of a single VNFC or multiple, interconnected VNFCs
      [ETS14d]

   VNF-FG:  Virtualized Network Function Forwarding Graph - an ordered
      list of VNFs or VNFCs creating a service chain.

3.  Scope

   This document assumes VNFs as black boxes when defining their
   benchmarking methodologies.  White box approaches are assumed and
   analysed as a particular case under the proper considerations of
   internal VNF instrumentation, later discussed in this document.

   In what follows, this document outlines a basis methodology for VNF
   benchmarking, specifically addressing its automation.

4.  Considerations

   VNF benchmarking considerations are defined in [RFC8172].
   Additionally, VNF pre-deployment testing considerations are well
   explored in [ETS14c].

4.1.  VNF Testing Methods

   Following the ETSI's model in [ETS14c], we distinguish three methods
   for VNF evaluation:

   Benchmarking:  Where parameters (e.g., cpu, memory, storage) are
      provided and the corresponding performance metrics (e.g., latency,
      throughput) are obtained.  Note, such request might create
      multiple reports, for example, with minimal latency or maximum
      throughput results.

   Verification:  Both parameters and performance metrics are provided
      and a stimulus verify if the given association is correct or not.



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   Dimensioning:  Where performance metrics are provided and the
      corresponding parameters obtained.  Note, multiple deployment
      interactions may be required, or if possible, underlying allocated
      resources need to be dynamically altered.

   Note: Verification and Dimensioning can be reduced to Benchmarking.
   Therefore, we detail Benchmarking in what follows.

4.2.  Generic VNF Benchmarking Setup

   A generic VNF benchmarking setup is shown in Figure 1, and its
   components are explained below.  Note here, not all components are
   mandatory, and VNF benchmarking scenarios, further explained, can
   dispose its components in varied settings.


                              +---------------+
                              |    Manager    |
                Control       | (Coordinator) |
                Interface     +---+-------+---+
             +--------+-----------+       +-------------------+
             |        |                                       |
             |        |   +-------------------------+         |
             |        |   |    System Under Test    |         |
             |        |   |                         |         |
             |        |   |    +-----------------+  |         |
             |     +--+------- +       VNF       |  |         |
             |     |           |                 |  |         |
             |     |           | +----+   +----+ |  |         |
             |     |           | |VNFC|...|VNFC| |  |         |
             |     |           | +----+   +----+ |  |         |
             |     |           +----.---------.--+  |         |
       +-----+---+ |  Monitor  |    :         :     |   +-----+----+
       | Agent   | |{listeners}|----^---------V--+  |   |  Agent   |
       |(Sender) | |           |    Execution    |  |   |(Receiver)|
       |         | |           |   Environment   |  |   |          |
       |{Probers}| +-----------|                 |  |   |{Probers} |
       +-----.---+        |    +----.---------.--+  |   +-----.----+
             :            +---------^---------V-----+         :
             V                      :         :               :
             :................>.....:         :............>..:
             Stimulus Traffic Flow


                 Figure 1: Generic VNF Benchmarking Setup

   Agent --  executes active stimulus using probers, i.e., benchmarking
      tools, to benchmark and collect network and system performance



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      metrics.  While a single Agent is capable of performing localized
      benchmarks in execution environments (e.g., stress tests on CPU,
      memory, disk I/O), the interaction among distributed Agents enable
      the generation and collection of VNF end-to-end metrics (e.g.,
      frame loss rate, latency).  In a benchmarking setup, one Agent can
      create the stimuli and the other end be the VNF itself where, for
      example, one-way latency is evaluated.  An Agent can be defined by
      a physical or virtual network function.



      Prober --  defines a software/hardware-based tool able to generate
         stimulut traffic specific to a VNF (e.g., sipp) or generic to
         multiple VNFs (e.g., pktgen).  A Prober must provide
         programmable interfaces for its life cycle management
         workflows, e.g., configuration of operational parameters,
         execution of stilumi, parsing of extracted metrics, and
         debugging options.  Specific Probers might be developed to
         abstract and to realize the description of particular VNF
         benchmarking methodologies.

   Monitor --  when possible, it is instantiated inside the target VNF
      or NFVI PoP (e.g., as a plug-in process in a virtualized
      environment) to perform passive monitoring, using listeners, for
      metrics collection based on benchmark tests evaluated according to
      Agents` stimuli.  Different from the active approach of Agents
      that can be seen as generic benchmarking VNFs, Monitors observe
      particular properties according to NFVI PoPs and VNFs
      capabilities.  A Monitor can be defined as a virtual network
      function.



      Listener --  defines one or more software interfaces for the
         extraction of particular metrics monitored in a target VNF and/
         or execution environment.  A Listener must provide programmable
         interfaces for its life cycle management workflows, e.g.,
         configuration of operational parameters, execution of
         monitoring captures, parsing of extracted metrics, and
         debugging options.  White-box benchmarking approaches must be
         carefully analyzed, as varied methods of performance monitoring
         might be coded as a Listener, possibly impacting the VNF and/or
         execution environment performance results.

   Manager --  in a VNF benchmarking setup, a Manager is responsible for
      (i) the coordination and synchronization of activities of Agents
      and Monitors, (ii) collecting and parsing all VNF benchmarking
      results, and (iii) aggregating the inputs and parsed benchmark



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      outputs to construct a VNF performance profile, which defines a
      report that correlates the VNF stimuli and the monitored metrics.
      A Manager executes the main configuration, operation, and
      management actions to deliver the VNF benchmarking results.  A
      Manager can be defined as a physical or virtual network function,
      and be split into multiple sub-components, each responsible for
      separated functional aspects of the overall Manager component.

   Virtualized Network Function (VNF) --  consists of one or more
      software components, so called VNF components (VNFC), adequate for
      performing a network function according to allocated virtual
      resources and satisfied requirements in an execution environment.
      A VNF can demand particular configurations for benchmarking
      specifications, demonstrating variable performance profiles based
      on available virtual resources/parameters and configured
      enhancements targeting specific technologies (e.g., NUMA, SR-IOV,
      CPU-Pinning).

   Execution Environment --  defines a virtualized and controlled
      composition of capabilities necessary for the execution of a VNF.
      An execution environment stands as a general purpose level of
      virtualization with abstracted resources available for one or more
      VNFs.  It can also define specific technology habilitation,
      incurring in viable settings for enhancing the performance of
      VNFs.

4.3.  Deployment Scenarios

   A VNF benchmark deployment scenario establishes the physical and/or
   virtual instantiation of components defined in a VNF benchmarking
   setup.

   The following considerations hold for deployment scenarios:

   o  Components can be composed in a single entity and be defined as
      black or white boxes.  For instance, Manager and Agents could
      jointly define one hardware/software entity to perform a VNF
      benchmark and present results.

   o  Monitor is not a mandatory component and must be considered only
      when performed white box benchmarking approaches for a VNF and/or
      its execution environment.

   o  Monitor can be defined by multiple instances of software
      components, each addressing a VNF or execution environment and
      their respective open interfaces for the extraction of metrics.





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   o  Agents can be disposed in varied topology setups, included the
      possibility of multiple input and output ports of a VNF being
      directly connected each in one Agent.

   o  All benchmarking components defined in a deployment scenario must
      perform the synchronization of clocks.

4.4.  Influencing Aspects

   In general, VNF benchmarks must capture relevant causes of
   performance variability.  Concerning a deployment scenario,
   influencing aspects on the performance of a VNF can be observed in:

   Deployment Scenario Topology:  The disposition of components can
      define particular interconnections among them composing a specific
      case/method of VNF benchmarking.

   Execution Environment:  The availability of generic and specific
      capabilities satisfying VNF requirements define a skeleton of
      opportunities for the allocation of VNF resources.  In addition,
      particular cases can define multiple VNFs interacting in the same
      execution environment of a benchmarking setup.

   VNF:  A detailed description of functionalities performed by a VNF
      sets possible traffic forwarding and processing operations it can
      perform on packets, added to its running requirements and specific
      configurations, which might affect and compose a benchmarking
      setup.

   Agent:  The toolset available for the benchmarking stimulus of a VNF
      and its characteristics of packets format and workload can
      interfere in a benchmarking setup.  VNFs can support specific
      traffic format as stimulus.

   Monitor:  In a particular benchmarking setup where measurements of
      VNF and/or execution environment metrics are available for
      extraction, an important analysis consist in verifying if the
      Monitor components can impact performance metrics of the VNF and
      the underlying execution environment.

   Manager:  The overall composition of VNF benchmarking procedures can
      determine arrangements of internal states inside a VNF, which can
      interfere in observed benchmarking metrics.

   The listed influencing aspects must be carefully analyzed while
   automating a VNF benchmarking methodology.





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5.  Methodology

   Portability is an intrinsic characteristic of VNFs and allows them to
   be deployed in multiple environments.  This enables various
   benchmarking procedures in varied deployment scenarios.  A VNF
   benchmarking methodology must be described in a clear and objective
   manner in order to allow effective repeatability and comparability of
   the test results.  Those results, the outcome of a VNF benchmarking
   process, are captured in a VNF Benchmarking Report (VNF-BR) as shown
   in Figure 2.

                                             X
                                            / \
                                           /   \
                                          /     \
               +--------+                /       \
               |        |               /         \
               | VNF-BD |--(defines)-->| Benchmark |
               |        |               \ Process /
               +--------+                \       /
                                          \     /
                                           \   /
                                            \ /
                                             V
                                             |
                                        (generates)
                                             |
                                             v
                                +-------------------------+
                                |         VNF-BR          |
                                | +--------+   +--------+ |
                                | |        |   |        | |
                                | | VNF-BD |   | VNF-PP | |
                                | | {copy} |   |        | |
                                | +--------+   +--------+ |
                                +-------------------------+

           Figure 2: VNF benchmarking process inputs and outputs

   VNF Benchmarking reports comprise two parts:

   VNF Benchmarking Descriptor (VNF-BD) --   contains all required
      definitions and requirements to configure, execute and reproduce
      VNF benchmarking experiments.  VNF-BDs are defined by the
      developer of a benchmarking experiment and serve as input to the
      benchmarking process, before being included in the generated VNF-
      BR.




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   VNF Performance Profile (VNF-PP) --   contains all measured metrics
      resulting from the execution of a benchmark.  Additionally, it
      might also contain additional recordings of configuration
      parameters used during the execution of the benchmarking scenario
      to facilitate comparability of VNF-BRs.

   A VNF-BR correlates structural and functional parameters of VNF-BD
   with extracted VNF benchmarking metrics of the obtained VNF-PP.  The
   content of each part of a VNF-BR is described in the following
   sections.

5.1.  VNF Benchmarking Descriptor (VNF-BD)

   VNF Benchmarking Descriptor (VNF-BD) -- an artifact that specifies a
   method of how to measure a VNF Performance Profile.  The
   specification includes structural and functional instructions and
   variable parameters at different abstraction levels (e.g., topology
   of the deployment scenario, benchmarking target metrics, parameters
   of benchmarking components).  VNF-BD may be specific to a VNF or
   applicable to several VNF types.  A VNF-BD can be used to elaborate a
   VNF benchmark deployment scenario aiming at the extraction of
   particular VNF performance metrics.

   The following items define the VNF-BD contents.

5.1.1.  Procedures Configuration

   The definition of parameters concerning the execution of the
   benchmarking procedures (see Section 5.3), for instance, containing
   the number of repetitions and duration of each test.

5.1.2.  Target Information

   General information addressing the target VNF, with references to any
   of its specific characteristics (e.g., type, model, version/release,
   architectural components, etc).  In addition, it defines the metrics
   to be extracted when running the benchmarking tests.

5.1.3.  Deployment Scenario

   This section of a VNF-BD contains all information needed to describe
   the deployment of all involved components used during the
   benchmarking test.








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5.1.3.1.  Topology

   Information about the experiment topology, concerning the disposition
   of the components in a benchmarking setup (see Section 4.2).  It must
   define the role of each component and how they are interconnected
   (i.e., interface, link and network characteristics).

5.1.3.2.  Requirements

   Involves the definition of execution environment requirements to
   execute the tests.  Therefore, they concern all required capabilities
   needed for the execution of the target VNF and the other components
   composing the benchmarking setup.  Examples of specifications
   involve: min/max allocation of resources, specific enabling
   technologies (e.g., DPDK, SR-IOV, PCIE).

5.1.3.3.  Parameters

   Involves any specific configuration of benchmarking components in a
   setup described the the deployment scenario topology.

   VNF Configurations:   Defines any specific configuration that must be
      loaded into the VNF to execute the benchmarking experiments (e.g.,
      routing table, firewall rules, vIMS subscribers profile).

   VNF Resources:   Contains particular VNF resource configurations that
      should be tested during the benchmarking process, e.g., test the
      VNF for configurations with 2, 4, and 8 vCPUs associated.

   Agents:   Defines the configured toolset of available probers and
      related benchmarking/active metrics, available workloads, traffic
      formats/traces, and configurations to enable hardware capabilities
      (if existent).

   Monitors:   defines the configured toolset of available listeners and
      related monitoring/passive metrics, configuration of the
      interfaces with the monitoring target (VNF and/or execution
      environment), and configurations to enable specific hardware
      capabilities (if existent).

5.2.  VNF Performance Profile (VNF-PP)

   VNF Performance Profile (VNF-PP) -- defines a mapping between
   resources allocated to a VNF (e.g., CPU, memory) as well as assigned
   configurations (e.g., routing table used by the VNF) and the VNF
   performance metrics (e.g., throughput, latency between in/out ports)
   obtained in a benchmarking test conducted using a VNF-BD.  Logically,
   packet processing metrics are presented in a specific format



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   addressing statistical significance (e.g., median, standard
   deviation, percentiles) where a correspondence among VNF parameters
   and the delivery of a measured VNF performance exists.

   The following items define the VNF-PP contents.

5.2.1.  Execution Environment

   Execution environment information is has to be included in every VNF-
   PP and is required to describe the environment on which a benchmark
   was actually executed.

   Ideally, any person who has a VNF-BD and its complementing VNF-PP
   with its execution environment information available, must be able to
   reproduce the same deployment scenario and VNF benchmarking tests to
   obtain identical VNF-PP measurement results.

   If not already defined by the VNF-BD deployment scenario requirements
   (Section 5.1.3), for each component in the VNF benchmarking setup,
   the following topics must be detailed:

   Hardware Specs:   Contains any information associated with the
      underlying hardware capabilities offered and used by the component
      during the benchmarking tests.  Examples of such specification
      include allocated CPU architecture, connected NIC specs, allocated
      memory DIMM, etc.  In addition, any information concerning details
      of resource isolation must also be described in this part of the
      VNF-PP.

   Software Specs:   Contains any information associated with the
      software apparatus offered and used during the benchmarking tests.
      Examples include versions of operating systems, kernels,
      hypervisors, container image versions, etc.

   Optionally, a VNF-PP execution environment might contain references
   to an orchestration description document (e.g., HEAT template) to
   clarify technological aspects of the execution environment and any
   specific parameters that it might contain for the VNF-PP.

5.2.2.  Measurement Results

   Measurement results concern the extracted metrics, output of
   benchmarking procedures, classified into:

   VNF Processing/Active Metrics:   Concerns metrics explicitly defined
      by or extracted from direct interactions of Agents with a VNF.
      Those can be defined as generic metric related to network packet




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      processing (e.g., throughput, latency) or metrics specific to a
      particular VNF (e.g., vIMS confirmed transactions, DNS replies).

   VNF Monitored/Passive Metrics:   Concerns the Monitors' metrics
      captured from a VNF execution, classified according to the
      virtualization level (e.g., baremetal, VM, container) and
      technology domain (e.g., related to CPU, memory, disk) from where
      they were obtained.

   Depending on the configuration of the benchmarking setup and the
   planned use cases for the resulting VNF-PPs, measurement results can
   be stored as raw data, e.g., time series data about CPU utilization
   of the VNF during a throughput benchmark.  In the case of VNFs
   composed of multiple VNFCs, those resulting data should be
   represented as vectors, capturing the behavior of each VNFC, if
   available from the used monitoring systems.  Alternatively, more
   compact representation formats can be used, e.g., statistical
   information about a series of latency measurements, including
   averages and standard deviations.  The exact output format to be used
   is defined in the complementing VNF-BD (Section 5.1).

   A VNF performance profile must address the combined set of classified
   items in the 3x3 Matrix Coverage defined in [RFC8172].

5.3.  Automated Benchmarking Procedures

   VNF benchmarking offers the possibility of defining distinct aspects/
   steps that may or may not be automated:

   Orchestration:   placement (assignment/allocation of resources) and
      interconnection (physical/virtual) of network function(s) and
      benchmark components (e.g., OpenStack/Kubernetes templates, NFV
      description solutions, like OSM, SONATA, ONAP) -> Defines
      deployment scenario.

   Management/Configuration:   benchmark components and VNF are
      configured to execute the experiment/test (e.g., populate routing
      table, load pcap source files in agent) -> Realizes VNF-BD
      settings.

   Execution:   Tests/experiments are executed according to
      configuration and orchestrated components -> Runs the VNF
      benchmarking cases.

   Output:   There might be generic VNF footprint metrics (e.g., CPU,
      memory) and specific VNF traffic processing metrics (e.g.,
      transactions or throughput).  Output processing must be taken into




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      account (e.g., if sampling is applied or not) in a generic
      (statistics) or specific (clustering) ways -> Generates VNF-PP.

   For the purposes of dissecting the execution procedures, consider the
   following definitions:

   Trial:   is a single process or iteration to obtain VNF benchmarking
      metrics as a singular measurement.

   Test:   Defines strict parameters for benchmarking components to
      perform one or more trials.  Multiple Trials must be performed for
      statistical significance of the obtained benchmarking results of a
      Test.  Each Trial must be executed following a particular
      deployment scenario composed by a VNF-BD.  Proper measures must be
      taken to ensure statistic validity (e.g., independence across
      trials of generated load patterns).

   Method:   Consists of a VNF-BD, including one or more Tests to
      benchmark a VNF.  A Method can explicitly list ranges of parameter
      values for the configuration of benchmarking components.  Each
      value of such a range is to be realized in a Test.  I.e., Methods
      can define parameter studies.

   The following sequence of events composes basic, general procedures
   to execute a Test (as defined above).

   1.   A VNF-BD must be defined to be later instantiated into and
      executed as a deployment scenario.  Such a description must
      contain all the structural and functional settings defined in
      Section 5.1.  At the end of this step, the complete method of
      benchmarking the target VNF is defined.

   2.   Via an automated orchestrator or in a manual process, all the
      components of the VNF benchmark setup must be allocated and
      interconnected.  VNF and the execution environment must be
      configured to properly address the VNF benchmark stimuli.

   3.   Manager, Agent(s) and Monitor(s) (if existing), must be started
      and configured to execute the benchmark stimuli and retrieve
      expected metrics captured during or at the end of each Trial.  One
      or more trials realize the required measurements to characterize
      the performance behavior of a VNF according to the benchmark setup
      defined in the VNF-BD.

   4.   Output results from each obtained benchmarking test must be
      collected by the Manager.  In an automated or manual process,
      intended metrics, as described in the VNF-BD, are extracted and
      combined to the final VNF-PP.  The combination of used VNF-BD and



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      generated VNF-PP make up the resulting VNF benchmark report (VNF-
      BR).

5.4.  Particular Cases

   Configurations and procedures concerning particular cases of VNF
   benchmarks address testing methodologies proposed in [RFC8172].  In
   addition to the general description previously defined, some details
   must be taken into consideration in the following VNF benchmarking
   cases.

   Noisy Neighbor:   An Agent can assume the role of a noisy neighbor,
      generating a particular workload in synchrony with a benchmarking
      procedure over a VNF.  Adjustments of the noisy workload stimulus
      type, frequency, virtualization level, among others, must be
      detailed in the VNF-BD.

   Representative Capacity:   An average value of workload must be
      specified as an Agent stimulus.  Considering a long-term analysis,
      the VNF must be configured to properly address a desired average
      behavior of performance in comparison with the value of the
      workload stimulus.

   Flexibility and Elasticity:   Having the possibility of a VNF be
      composed by multiple components (VNFCs), internal events of the
      VNF might trigger changes in VNF behavior, e.g., activating
      functionalities associated with elasticity such as load balancing.
      In this sense, a detailed characterization of a VNF must be
      specified (e.g. the VNFs scaling state) and be contained in the
      VNF-PP and thus the VNF benchmarking report.

   On Failures:   Similar to the case before, VNF benchmarking setups
      must also capture the dynamics involved in VNF behavior.  In case
      of failures, a VNF might restart itself and possibly result in an
      offline period (e.g., self healing).  A VNF-PP and benchmarking
      report must capture such variation of VNF states.

   White Box VNF:   A benchmarking setup must define deployment
      scenarios to be compared with and without monitor components into
      the VNF and/or the execution environment, in order to analyze if
      the VNF performance is affected.  The VNF-PP and benchmarking
      report must contain such analysis of performance variability,
      together with all the extracted VNF performance metrics.








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6.  Open Source Reference Implementations

   There are two open source reference implementations that are build to
   automate benchmarking of Virtualized Network Functions (VNFs).

6.1.  Gym

   The software, named Gym, is a framework for automated benchmarking of
   Virtualized Network Functions (VNFs).  It was coded following the
   initial ideas presented in a 2015 scientific paper entitled "VBaaS:
   VNF Benchmark-as-a-Service" [Rosa-a].  Later, the evolved design and
   prototyping ideas were presented at IETF/IRTF meetings seeking impact
   into NFVRG and BMWG.

   Gym was built to receive high-level test descriptors and execute them
   to extract VNFs profiles, containing measurements of performance
   metrics - especially to associate resources allocation (e.g., vCPU)
   with packet processing metrics (e.g., throughput) of VNFs.  From the
   original research ideas [Rosa-a], such output profiles might be used
   by orchestrator functions to perform VNF lifecycle tasks (e.g.,
   deployment, maintenance, tear-down).

   The proposed guiding principles, elaborated in [Rosa-b], to design
   and build Gym can be composed in multiple practical ways for
   different VNF testing purposes:

   o  Comparability: Output of tests shall be simple to understand and
      process, in a human-read able format, coherent, and easily
      reusable (e.g., inputs for analytic applications).

   o  Repeatability: Test setup shall be comprehensively defined through
      a flexible design model that can be interpreted and executed by
      the testing platform repeatedly but supporting customization.

   o  Configurability: Open interfaces and extensible messaging models
      shall be available between components for flexible composition of
      test descriptors and platform configurations.

   o  Interoperability: Tests shall be ported to different environments
      using lightweight components.

   In [Rosa-b] Gym was utilized to benchmark a decomposed IP Multimedia
   Subsystem VNF.  And in [Rosa-c], a virtual switch (Open vSwitch -
   OVS) was the target VNF of Gym for the analysis of VNF benchmarking
   automation.  Such articles validated Gym as a prominent open source
   reference implementation for VNF benchmarking tests.  Such articles
   set important contributions as discussion of the lessons learned and
   the overall NFV performance testing landscape, included automation.



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   Gym stands as one open source reference implementation that realizes
   the VNF benchmarking methodologies presented in this document.  Gym
   is being released open source at [Gym].  The code repository includes
   also VNF Benchmarking Descriptor (VNF-BD) examples on the vIMS and
   OVS targets as described in [Rosa-b] and [Rosa-c].

6.2.  tng-bench

   Another software that focuses on implementing a framework to
   benchmark VNFs is the "5GTANGO VNF/NS Benchmarking Framework" also
   called "tng-bench" (previously "son-profile") and was is as part of
   the two European Union H2020 projects SONATA NFV and 5GTANGO [tango].
   Its initial ideas were presented in [Peu-a] and the system design of
   the end-to-end prototype was presented in [Peu-b].

   Tng-bench's aims to act as a framework for the end-to-end automation
   of VNF benchmarking processes.  Its goal is to automate the
   benchmarking process in such a way that VNF-PPs can be generated
   without further human interaction.  This enables the integration of
   VNF benchmarking into continuous integration and continuous delivery
   (CI/CD) pipelines so that new VNF-PPs are generated on-the-fly for
   every new software version of a VNF.  Those automatically generated
   VNF-PPs can then be bundled with the VNFs and serve as inputs for
   orchestration systems, fitting to the original research ideas
   presented in [Rosa-a] and [Peu-a].

   Following the same high-level VNF testing purposes as Gym, namely:
   Comparability, repeatability, configurability, and interoperability,
   tng-bench specifically aims to explore description approaches for VNF
   benchmarking experiments.  In [Peu-b] a prototype specification VNF-
   BDs is presented which not only allows to specify generic, abstract
   VNF benchmarking experiments, it also allows to describe sets of
   parameter configurations to be tested during the benchmarking
   process, allowing the system to automatically execute complex
   parameter studies on the SUT, e.g., testing a VNF's performance under
   different CPU, memory, or software configurations.

   Tng-bench was used to perform a set of initial benchmarking
   experiments using different VNFs, like a Squid proxy, an Nginx load
   balancer, and a Socat TCP relay in [Peu-b].  Those VNFs have not only
   been benchmarked in isolation, but also in combined setups in which
   up to three VNFs were chained one after each other.  These
   experiments were used to test tng-bench for scenarios in which
   composed VNFs, consisting of multiple VNF components (VNFCs), have to
   be benchmarked.  The presented results highlight the need to
   benchmark composed VNFs in end-to-end scenarios rather than only
   benchmark each individual component in isolation, to produce
   meaningful VNF-PPs for the complete VNF.



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   Tng-bench is actively developed and released as open source tool
   under Apache 2.0 license [tng-bench].

7.  Security Considerations

   Benchmarking tests described in this document are limited to the
   performance characterization of VNFs in a lab environment with
   isolated network.

   The benchmarking network topology will be an independent test setup
   and MUST NOT be connected to devices that may forward the test
   traffic into a production network, or misroute traffic to the test
   management network.

   Special capabilities SHOULD NOT exist in the VNF benchmarking
   deployment scenario specifically for benchmarking purposes.  Any
   implications for network security arising from the VNF benchmarking
   deployment scenario SHOULD be identical in the lab and in production
   networks.

8.  IANA Considerations

   This document does not require any IANA actions.

9.  Acknowledgement

   The authors would like to thank the support of Ericsson Research,
   Brazil.  Parts of this work have received funding from the European
   Union's Horizon 2020 research and innovation programme under grant
   agreement No.  H2020-ICT-2016-2 761493 (5GTANGO: https://5gtango.eu).

10.  References

10.1.  Normative References

   [ETS14a]   ETSI, "Architectural Framework - ETSI GS NFV 002 V1.2.1",
              Dec 2014, <http://www.etsi.org/deliver/etsi\_gs/
              NFV/001\_099/002/01.02.01-\_60/gs\_NFV002v010201p.pdf>.

   [ETS14b]   ETSI, "Terminology for Main Concepts in NFV - ETSI GS NFV
              003 V1.2.1", Dec 2014,
              <http://www.etsi.org/deliver/etsi_gs/NFV/001_099-
              /003/01.02.01_60/gs_NFV003v010201p.pdf>.

   [ETS14c]   ETSI, "NFV Pre-deployment Testing - ETSI GS NFV TST001
              V1.1.1", April 2016,
              <http://docbox.etsi.org/ISG/NFV/Open/DRAFTS/TST001_-_Pre-
              deployment_Validation/NFV-TST001v0015.zip>.



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   [ETS14d]   ETSI, "Network Functions Virtualisation (NFV); Virtual
              Network Functions Architecture - ETSI GS NFV SWA001
              V1.1.1", December 2014,
              <https://docbox.etsi.org/ISG/NFV/Open/Publications_pdf/
              Specs-Reports/NFV-SWA%20001v1.1.1%20-%20GS%20-%20Virtual%2
              0Network%20Function%20Architecture.pdf>.

   [RFC1242]  S. Bradner, "Benchmarking Terminology for Network
              Interconnection Devices", July 1991,
              <https://www.rfc-editor.org/info/rfc1242>.

   [RFC8172]  A. Morton, "Considerations for Benchmarking Virtual
              Network Functions and Their Infrastructure", July 2017,
              <https://www.rfc-editor.org/info/rfc8172>.

   [RFC8204]  M. Tahhan, B. O'Mahony, A. Morton, "Benchmarking Virtual
              Switches in the Open Platform for NFV (OPNFV)", September
              2017, <https://www.rfc-editor.org/info/rfc8204>.

10.2.  Informative References

   [Gym]      "Gym Home Page", <https://github.com/intrig-unicamp/gym>.

   [Peu-a]    M. Peuster, H. Karl, "Understand Your Chains: Towards
              Performance Profile-based Network Service Management",
              Fifth European Workshop on Software Defined Networks
              (EWSDN) , 2016,
              <http://ieeexplore.ieee.org/document/7956044/>.

   [Peu-b]    M. Peuster, H. Karl, "Profile Your Chains, Not Functions:
              Automated Network Service Profiling in DevOps
              Environments", IEEE Conference on Network Function
              Virtualization and Software Defined Networks (NFV-SDN) ,
              2017, <http://ieeexplore.ieee.org/document/8169826/>.

   [Rosa-a]   R. V. Rosa, C. E. Rothenberg, R. Szabo, "VBaaS: VNF
              Benchmark-as-a-Service", Fourth European Workshop on
              Software Defined Networks , Sept 2015,
              <http://ieeexplore.ieee.org/document/7313620>.

   [Rosa-b]   R. Rosa, C. Bertoldo, C. Rothenberg, "Take your VNF to the
              Gym: A Testing Framework for Automated NFV Performance
              Benchmarking", IEEE Communications Magazine Testing
              Series , Sept 2017,
              <http://ieeexplore.ieee.org/document/8030496>.






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   [Rosa-c]   R. V. Rosa, C. E. Rothenberg, "Taking Open vSwitch to the
              Gym: An Automated Benchmarking Approach", IV Workshop pre-
              IETF/IRTF, CSBC Brazil, July 2017,
              <https://intrig.dca.fee.unicamp.br/wp-
              content/plugins/papercite/pdf/rosa2017taking.pdf>.

   [tango]    "5GTANGO: Development and validation platform for global
              industry-specific network services and apps",
              <https://5gtango.eu>.

   [tng-bench]
              "5GTANGO VNF/NS Benchmarking Framework",
              <https://github.com/sonata-nfv/tng-sdk-benchmark>.

Authors' Addresses

   Raphael Vicente Rosa (editor)
   University of Campinas
   Av. Albert Einstein, 400
   Campinas, Sao Paulo  13083-852
   Brazil

   Email: rvrosa@dca.fee.unicamp.br
   URI:   https://intrig.dca.fee.unicamp.br/raphaelvrosa/


   Christian Esteve Rothenberg
   University of Campinas
   Av. Albert Einstein, 400
   Campinas, Sao Paulo  13083-852
   Brazil

   Email: chesteve@dca.fee.unicamp.br
   URI:   http://www.dca.fee.unicamp.br/~chesteve/


   Manuel Peuster
   Paderborn University
   Warburgerstr. 100
   Paderborn  33098
   Germany

   Email: manuel.peuster@upb.de
   URI:   http://go.upb.de/peuster







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   Holger Karl
   Paderborn University
   Warburgerstr. 100
   Paderborn  33098
   Germany

   Email: holger.karl@upb.de
   URI:   https://cs.uni-paderborn.de/cn/











































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