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+.. This work is licensed under a Creative Commons Attribution 4.0 International
+.. License.
+.. http://creativecommons.org/licenses/by/4.0
+.. (c) OPNFV, Ericsson AB and others.
+
+*************************************
+Yardstick Test Case Description TC012
+*************************************
+
+.. _bw_mem: http://manpages.ubuntu.com/manpages/trusty/bw_mem.8.html
+
++-----------------------------------------------------------------------------+
+|Memory Bandwidth |
+| |
++--------------+--------------------------------------------------------------+
+|test case id | OPNFV_YARDSTICK_TC012_MEMORY BANDWIDTH |
+| | |
++--------------+--------------------------------------------------------------+
+|metric | Memory read/write bandwidth (MBps) |
+| | |
++--------------+--------------------------------------------------------------+
+|test purpose | The purpose of TC012 is to evaluate the IaaS compute |
+| | performance with regards to memory throughput. |
+| | It measures the rate at which data can be read from and |
+| | written to the memory (this includes all levels of memory). |
+| | |
+| | The purpose is also to be able to spot the trends. |
+| | Test results, graphs and similar shall be stored for |
+| | comparison reasons and product evolution understanding |
+| | between different OPNFV versions and/or configurations. |
+| | |
++--------------+--------------------------------------------------------------+
+|test tool | LMbench |
+| | |
+| | LMbench is a suite of operating system microbenchmarks. |
+| | This test uses bw_mem tool from that suite including: |
+| | * Cached file read |
+| | * Memory copy (bcopy) |
+| | * Memory read |
+| | * Memory write |
+| | * Pipe |
+| | * TCP |
+| | |
+| | (LMbench is not always part of a Linux distribution, hence |
+| | it needs to be installed. As an example see the |
+| | /yardstick/tools/ directory for how to generate a Linux |
+| | image with LMbench included.) |
+| | |
++--------------+--------------------------------------------------------------+
+|test | LMbench bw_mem benchmark allocates twice the specified |
+|description | amount of memory, zeros it, and then times the copying of |
+| | the first half to the second half. The benchmark is invoked |
+| | in a host VM on a compute blade. Results are reported in |
+| | megabytes moved per second. |
+| | |
++--------------+--------------------------------------------------------------+
+|configuration | File: opnfv_yardstick_tc012.yaml |
+| | |
+| | * SLA (optional): 15000 (MBps) min_bw: The minimum amount of |
+| | memory bandwidth that is accepted. |
+| | * Size: 10 240 kB - test allocates twice that size |
+| | (20 480kB) zeros it and then measures the time it takes to |
+| | copy from one side to another. |
+| | * Benchmark: rdwr - measures the time to read data into |
+| | memory and then write data to the same location. |
+| | * Warmup: 0 - the number of iterations to perform before |
+| | taking actual measurements. |
+| | * Iterations: 10 - test is run 10 times iteratively. |
+| | * Interval: 1 - there is 1 second delay between each |
+| | iteration. |
+| | |
+| | SLA is optional. The SLA in this test case serves as an |
+| | example. Considerably higher bandwidth is expected. |
+| | However, to cover most configurations, both baremetal and |
+| | fully virtualized ones, this value should be possible to |
+| | achieve and acceptable for black box testing. |
+| | Many heavy IO applications start to suffer badly if the |
+| | read/write bandwidths are lower than this. |
+| | |
++--------------+--------------------------------------------------------------+
+|applicability | Test can be configured with different: |
+| | |
+| | * memory sizes; |
+| | * memory operations (such as rd, wr, rdwr, cp, frd, fwr, |
+| | fcp, bzero, bcopy); |
+| | * number of warmup iterations; |
+| | * iterations and intervals. |
+| | |
+| | Default values exist. |
+| | |
+| | SLA (optional) : min_bandwidth: The minimun memory bandwidth |
+| | that is accepted. |
+| | |
++--------------+--------------------------------------------------------------+
+|usability | This test case is one of Yardstick's generic test. Thus it |
+| | is runnable on most of the scenarios. |
+| | |
++--------------+--------------------------------------------------------------+
+|references | LMbench bw_mem_ |
+| | |
+| | ETSI-NFV-TST001 |
+| | |
++--------------+--------------------------------------------------------------+
+|pre-test | The test case image needs to be installed into Glance |
+|conditions | with Lmbench included in the image. |
+| | |
+| | No POD specific requirements have been identified. |
+| | |
++--------------+--------------------------------------------------------------+
+|test sequence | description and expected result |
+| | |
++--------------+--------------------------------------------------------------+
+|step 1 | A host VM with LMbench installed is booted. |
+| | |
++--------------+--------------------------------------------------------------+
+|step 2 | Yardstick is connected with the host VM by using ssh. |
+| | "lmbench_bandwidth_benchmark" bash script is copied from |
+| | Jump Host to the host VM via ssh tunnel. |
+| | |
++--------------+--------------------------------------------------------------+
+|step 3 | 'lmbench_bandwidth_benchmark' script is invoked. LMbench's |
+| | bw_mem benchmark starts to measures memory read/write |
+| | bandwidth. Memory read/write bandwidth results are recorded |
+| | and checked against the SLA. Logs are produced and stored. |
+| | |
+| | Result: Logs are stored. |
+| | |
++--------------+--------------------------------------------------------------+
+|step 4 | The host VM is deleted. |
+| | |
++--------------+--------------------------------------------------------------+
+|test verdict | Test fails if the measured memory bandwidth is below the SLA |
+| | value or if there is a test case execution problem. |
+| | |
++--------------+--------------------------------------------------------------+