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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, Huawei Technologies Co.,Ltd and others.
+
+*************************************
+Yardstick Test Case Description TC004
+*************************************
+
+.. _cachestat: https://github.com/brendangregg/perf-tools/tree/master/fs
+
++-----------------------------------------------------------------------------+
+|Cache Utilization                                                            |
+|                                                                             |
++--------------+--------------------------------------------------------------+
+|test case id  | OPNFV_YARDSTICK_TC004_Cache Utilization                      |
+|              |                                                              |
++--------------+--------------------------------------------------------------+
+|metric        | Cache Utilization                                            |
+|              |                                                              |
++--------------+--------------------------------------------------------------+
+|test purpose  | To evaluate the IaaS compute capability with regards to      |
+|              | cache utilization.This test case should be run in parallel   |
+|              | to other Yardstick test cases and not run as a stand-alone   |
+|              | test case.                                                   |
+|              | Measure the cache usage statistics including cache hit,      |
+|              | cache miss, hit ratio, page cache size and page cache size.  |
+|              | Both average and maximun values are obtained.                |
+|              | The purpose is also to be able to spot trends.               |
+|              | Test results, graphs and similar shall be stored for         |
+|              | comparison reasons and product evolution understanding       |
+|              | between different OPNFV versions and/or configurations.      |
+|              |                                                              |
++--------------+--------------------------------------------------------------+
+|configuration | File: cachestat.yaml (in the 'samples' directory)            |
+|              |                                                              |
+|              | * interval: 1 - repeat, pausing every 1 seconds in-between.  |
+|              |                                                              |
++--------------+--------------------------------------------------------------+
+|test tool     | cachestat                                                    |
+|              |                                                              |
+|              | cachestat is not always part of a Linux distribution, hence  |
+|              | it needs to be installed.                                    |
+|              |                                                              |
++--------------+--------------------------------------------------------------+
+|references    | cachestat_                                                   |
+|              |                                                              |
+|              | ETSI-NFV-TST001                                              |
+|              |                                                              |
++--------------+--------------------------------------------------------------+
+|applicability | Test can be configured with different:                       |
+|              |                                                              |
+|              |  * interval;                                                 |
+|              |  * runner Duration.                                          |
+|              |                                                              |
+|              | There are default values for each above-mentioned option.    |
+|              | Run in background with other test cases.                     |
+|              |                                                              |
++--------------+--------------------------------------------------------------+
+|pre-test      | The test case image needs to be installed into Glance        |
+|conditions    | with cachestat 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. The related TC, or TCs, is  |
+|              | invoked and cachestat logs are produced and stored.          |
+|              |                                                              |
+|              | Result: logs are stored.                                     |
+|              |                                                              |
++--------------+--------------------------------------------------------------+
+|test verdict  | None. Cache utilization results are fetched and stored.      |
+|              |                                                              |
++--------------+--------------------------------------------------------------+