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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 TC010
-*************************************
-
-.. _lat_mem_rd: http://manpages.ubuntu.com/manpages/trusty/lat_mem_rd.8.html
-
-+-----------------------------------------------------------------------------+
-|Memory Latency |
-| |
-+--------------+--------------------------------------------------------------+
-|test case id | OPNFV_YARDSTICK_TC010_MEMORY LATENCY |
-| | |
-+--------------+--------------------------------------------------------------+
-|metric | Memory read latency (nanoseconds) |
-| | |
-+--------------+--------------------------------------------------------------+
-|test purpose | The purpose of TC010 is to evaluate the IaaS compute |
-| | performance with regards to memory read latency. |
-| | It measures the memory read latency for varying memory sizes |
-| | and strides. Whole memory hierarchy is measured. |
-| | |
-| | 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 lat_mem_rd tool from that suite including: |
-| | * Context switching |
-| | * Networking: connection establishment, pipe, TCP, UDP, and |
-| | RPC hot potato |
-| | * File system creates and deletes |
-| | * Process creation |
-| | * Signal handling |
-| | * System call overhead |
-| | * Memory read latency |
-| | |
-| | (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 lat_mem_rd benchmark measures memory read latency |
-|description | for varying memory sizes and strides. |
-| | |
-| | The benchmark runs as two nested loops. The outer loop is |
-| | the stride size. The inner loop is the array size. For each |
-| | array size, the benchmark creates a ring of pointers that |
-| | point backward one stride.Traversing the array is done by: |
-| | |
-| | p = (char **)*p; |
-| | |
-| | in a for loop (the over head of the for loop is not |
-| | significant; the loop is an unrolled loop 100 loads long). |
-| | The size of the array varies from 512 bytes to (typically) |
-| | eight megabytes. For the small sizes, the cache will have an |
-| | effect, and the loads will be much faster. This becomes much |
-| | more apparent when the data is plotted. |
-| | |
-| | Only data accesses are measured; the instruction cache is |
-| | not measured. |
-| | |
-| | The results are reported in nanoseconds per load and have |
-| | been verified accurate to within a few nanoseconds on an SGI |
-| | Indy. |
-| | |
-+--------------+--------------------------------------------------------------+
-|configuration | File: opnfv_yardstick_tc010.yaml |
-| | |
-| | * SLA (max_latency): 30 nanoseconds |
-| | * Stride - 128 bytes |
-| | * Stop size - 64 megabytes |
-| | * 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 lower read latency 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 latency is higher than this. |
-| | |
-+--------------+--------------------------------------------------------------+
-|applicability | Test can be configured with different: |
-| | |
-| | * strides; |
-| | * stop_size; |
-| | * iterations and intervals. |
-| | |
-| | Default values exist. |
-| | |
-| | SLA (optional) : max_latency: The maximum memory latency |
-| | 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 lat_mem_rd_ |
-| | |
-| | 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 | The host is installed as client. LMbench's lat_mem_rd tool |
-| | is invoked and logs are produced and stored. |
-| | |
-| | Result: logs are stored. |
-| | |
-+--------------+--------------------------------------------------------------+
-|step 1 | A host VM with LMbench installed is booted. |
-| | |
-+--------------+--------------------------------------------------------------+
-|step 2 | Yardstick is connected with the host VM by using ssh. |
-| | 'lmbench_latency_benchmark' bash script is copyied from Jump |
-| | Host to the host VM via the ssh tunnel. |
-| | |
-+--------------+--------------------------------------------------------------+
-|step 3 | 'lmbench_latency_benchmark' script is invoked. LMbench's |
-| | lat_mem_rd benchmark starts to measures memory read latency |
-| | for varying memory sizes and strides. Memory read latency |
-| | 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 latency is above the SLA |
-| | value or if there is a test case execution problem. |
-| | |
-+--------------+--------------------------------------------------------------+