|author||Maryam Tahhan <firstname.lastname@example.org>||2016-08-14 09:57:25 +0000|
|committer||Gerrit Code Review <email@example.com>||2016-08-14 09:57:25 +0000|
diff --git a/docs/requirements/02-measuring_telco_traffic_and_performance_KPIs.rst b/docs/requirements/02-measuring_telco_traffic_and_performance_KPIs.rst
index 511128c..7f0d486 100644
@@ -4,7 +4,7 @@
Measuring Telco Traffic and Performance KPIs
-This section will look at what SFQM has done to enable Measuring Telco Traffic
+This section will discuss the SFQM features that enable Measuring Telco Traffic
and Performance KPIs.
.. Figure:: stats_and_timestamps.png
@@ -28,30 +28,146 @@ and Performance KPIs.
* For DPDK 2.2 the API was implemented for igb, i40e and all the Virtual
Functions (VFs) for all drivers.
+ * For DPDK 16.07 the API migrated from using string value pairs to using id
+ value pairs, improving the overall performance of the API.
Monitoring DPDK interfaces
With the features SFQM enabled in DPDK to enable measuring Telco traffic and
performance KPIs, we can now retrieve NIC statistics including error stats and
relay them to a DPDK user. The next step is to enable monitoring of the DPDK
-interfaces based on the stats that we are retrieving from the NICs, and relay
+interfaces based on the stats that we are retrieving from the NICs, by relaying
the information to a higher level Fault Management entity. To enable this SFQM
has been enabling a number of plugins for collectd.
-collectd is is a daemon which collects system performance statistics periodically
-and provides mechanisms to store the values in a variety of ways. It supports
-more than 90 different plugins to retrieve platform information, such as CPU
-utilization, and is capable of publishing/writing the information is gathers to
-a number of endpoints through its write plugins.
+collectd is a daemon which collects system performance statistics periodically
+and provides a variety of mechanisms to publish the collected metrics. It
+supports more than 90 different input and output plugins. Input plugins retrieve
+metrics and publish them to the collectd deamon, while output plugins publish
+the data they receive to an end point. collectd also has infrastructure to
+support thresholding and notification.
+Statistics and Notifications
+Within collectd notifications and performance data are dispatched in the same
+way. There are producer plugins (plugins that create notifications/metrics),
+and consumer plugins (plugins that receive notifications/metrics and do
+something with them).
+Statistics in collectd consist of a value list. A value list includes:
+* Values, can be one of:
+ * Derive: used for values where a change in the value since it's last been
+ read is of interest. Can be used to calculate and store a rate.
+ * Counter: similar to derive values, but take the possibility of a counter
+ wrap around into consideration.
+ * Gauge: used for values that are stored as is.
+ * Absolute: used for counters that are reset after reading.
+* Value length: the number of values in the data set.
+* Time: timestamp at which the value was collected.
+* Interval: interval at which to expect a new value.
+* Host: used to identify the host.
+* Plugin: used to identify the plugin.
+* Plugin instance (optional): used to group a set of values together. For e.g.
+ values belonging to a DPDK interface.
+* Type: unit used to measure a value. In other words used to refer to a data
+* Type instance (optional): used to distinguish between values that have an
+ identical type.
+* meta data: an opaque data structure that enables the passing of additional
+ information about a value list. "Meta data in the global cache can be used to
+ store arbitrary information about an identifier" .
+Host, plugin, plugin instance, type and type instance uniquely identify a
+Values lists are often accompanied by data sets that describe the values in more
+detail. Data sets consist of:
+* A type: a name which uniquely identifies a data set.
+* One or more data sources (entries in a data set) which include:
+ * The name of the data source. If there is only a single data source this is
+ set to "value".
+ * The type of the data source, one of: counter, gauge, absolute or derive.
-SFQM has been enabling two collectd plugins to collect DPDK NIC statistics and
-push the stats to Ceilometer:
+ * A min and a max value.
-* dpdkstat plugin: A read plugin that retrieve stats from the DPDK extended NIC
- stats API.
-* ceilometer plugin: A write plugin that pushes the retrieved stats to
+Types in collectd are defined in types.db. Examples of types in types.db:
+.. code-block:: console
+ bitrate value:GAUGE:0:4294967295
+ counter value:COUNTER:U:U
+ if_octets rx:COUNTER:0:4294967295, tx:COUNTER:0:4294967295
+In the example above if_octets has two data sources: tx and rx.
+Notifications in collectd are generic messages containing:
+* An associated severity, which can be one of OKAY, WARNING, and FAILURE.
+* A time.
+* A Message
+* A host.
+* A plugin.
+* A plugin instance (optional).
+* A type.
+* A types instance (optional).
+SFQM has enabled three collectd plugins to date:
+* `dpdkstat plugin`_: A read plugin that retrieve stats from the DPDK extended
+ NIC stats API.
+* `ceilometer plugin`_: A write plugin that pushes the retrieved stats to
Ceilometer. It's capable of pushing any stats read through collectd to
Ceilometer, not just the DPDK stats.
+* `hugepages plugin`_: A read plugin that retrieves the number of available
+ and free hugepages on a platform as well as what is available in terms of
+ hugepages per socket.
+Other plugins in progress:
+* dpdkevents: A read plugin that retrieves DPDK link status and DPDK
+ forwarding cores liveliness status (DPDK Keep Alive).
+* Open vSwitch stats Plugin: A read plugin that retrieve flow and interface
+ stats from OVS.
+* Open vSwitch events Plugin: A read plugin that retrieves events from OVS.
+Monitoring Interfaces and Openstack Support
.. Figure:: monitoring_interfaces.png
Monitoring Interfaces and Openstack Support
@@ -63,9 +179,17 @@ and publishing the retrieved stats to Ceilometer through the ceilometer plugin.
To see this demo in action please checkout: `SFQM OPNFV Summit demo`_
-Future enahancements to the DPDK stats plugin include:
-* Integration of DPDK Keep Alive functionality.
-* Implementation of the ability to retrieve link status.
.. _SFQM OPNFV Summit demo: https://prezi.com/kjv6o8ixs6se/software-fastpath-service-quality-metrics-demo/
+.. _dpdkstat plugin: https://github.com/maryamtahhan/collectd-with-DPDK/tree/dpdkstat
+.. _ceilometer plugin: https://github.com/openstack/collectd-ceilometer-plugin/tree/stable/mitaka
+.. _hugepages plugin: https://github.com/maryamtahhan/collectd-with-DPDK/tree/hugepages