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+Measuring Telco Traffic and Performance KPIs
+This section will look at what SFQM has done to enable Measuring Telco Traffic
+and Performance KPIs.
+.. Figure:: stats_and_timestamps.png
+ Measuring Telco Traffic and Performance KPIs
+* The very first thing SFQM enabled was a call-back API in DPDK and an
+ associated application that used the API to demonstrate how to timestamp
+ packets and measure packet latency in DPDK (the sample app is called
+ rxtx_callbacks). This was upstreamed to DPDK 2.0 and is represented by
+ the interfaces 1 and 2 in Figure 1.2.
+* The second thing SFQM implemented in DPDK is the extended NIC statistics API,
+ which exposes NIC stats including error stats to the DPDK user by reading the
+ registers on the NIC. This is represented by interface 3 in Figure 1.2.
+ * For DPDK 2.1 this API was only implemented for the ixgbe (10Gb) NIC driver,
+ in association with a sample application that runs as a DPDK secondary
+ process and retrieves the extended NIC stats.
+ * For DPDK 2.2 the API was implemented for igb, i40e and all the Virtual
+ Functions (VFs) for all drivers.
+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
+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.
+SFQM has been enabling two collectd plugins to collect DPDK NIC statistics and
+push the stats to Ceilometer:
+* 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.
+.. Figure:: monitoring_interfaces.png
+ Monitoring Interfaces and Openstack Support
+The figure above shows the DPDK L2 forwarding application running on a compute
+node, sending and receiving traffic. collectd is also running on this compute
+node retrieving the stats periodically from DPDK through the dpdkstat plugin
+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/