The Application Timings page provides Network Performance Monitoring (NPM) information including metrics such as Round Trip Time (RTT), Server Response Time (SRT), and Retransmissions (RTR).

Note: For metrics to appear on the Application Timings page, you must have a Flowmon Collector deployed. For further details, refer to the following section: Create and deploy a Flowmon Collector.

You can select the relevant time span to display details of network performance metrics, for example, for the Last hour, Last 6 hours, Last 12 hours, and so on.

You can click Reset at any time to revert to the default view.

Average client to server time statistics

The time statistics chart provides a high-level overview of the quality of the end-user experience and where any slowdowns may be occurring. The chart shows the average time required to complete a single transaction, such as an HTTP request. You may find it helpful to compare the end-to-end time against other metrics to see how increases in traffic impact the ability of the application to respond.

From left to right, this pane displays the following timing information:
  • Client RTT: Average network TCP latency between the clients and the selected application. This metric indicates how long it takes to establish connections and return acknowledgments. Because this is TCP, this number will often be higher than an ICMP ping.
  • Server RTT: This is the average round trip latency between the LoadMaster and servers. An abnormally high server RTT may indicate either that the network is saturated or more likely that a server’s TCP stack is overwhelmed and cannot quickly establish new connections.
  • Client RTR: Retransmission (RTR) represents a situation when data packets are not correctly delivered between communication parties and need to be resent or reassembled. Client RTR displays the number of Retransmissions (RTR) (including minimum, maximum, and average value across Virtual Services) for requests raised from the client within the selected time domain.
  • Server RTR: Displays the retransmission counters (including the minimum, maximum, and average value) for responses from the servers.

Application end to end timings

This graph provides information about the Virtual Service (RTT and SRT) and Real Server (RTT and SRT) performance statistics data. Hovering the mouse over any point in the chart displays the results for that selected time.

Under the chart, you can select which lines to show, such as the Virtual Service and individual Real Server.

Application traffic insights

This graph provides information about the Virtual Service and Real Server performance statistics, including retransmission data. Hovering the mouse over any point in the chart displays the results for that selected time.

Under the chart, you can select which lines to show, such as the Virtual Service, individual Real Server, and Retransmissions data. For example, if the Virtual Service data is heavily skewed by one very large metric, you can deselect that metric and the chart will display the remaining metrics. Changing the chart values using these controls may change the value of the vertical Y-axis. You can select a particular segment of time in the slider under the graph.

The table under the Application traffic insights graph contains the following metrics:
Note: These metrics are polled every 5 minutes.
  • Application: Lists the Virtual Service, Real Servers, and all traffic.
  • Maximal bits per second
  • Average bits per second
  • Average SRT: Server Response Time is measured for all TCP flows and UDP flows with DNS traffic (that is, UDP flows where one of the ports is 53). All time measurements are done in microsecond precision.
  • Average RTT: Round Trip Time represents network delay (of packets going from the client to the server and back). It is available for TCP-based network communication and measured by observing the TCP handshake.
  • Average RTR: Retransmissions or Out-of-Order packets represent a situation when data packets are not correctly delivered between communication parties and need to be resent or reassembled.

For further details on the metrics, refer to the Flowmon User Guide.

Client Connections

The Client Connections widget contains several sections that get information from either the LoadMaster or Flowmon Collector:
  • The following sections are populated based on data received from the LoadMaster:
    • Total active connections
    • Peak throughput
    • Top request methods
    • Highest server based on connections
  • The following sections are populated based on data received from the Flowmon Collector:
    • Map view
    • Top client by throughput
This map view shows a graphical representation of a Data Center and the clients connected to it. Site, Connector, and application details are displayed when you hover over the Data Center. The amount of bandwidth used between the client and Data Center during the selected time period (which is displayed in the bottom-left of the Client Connection section) is displayed when you hover over the line between them. Hovering over the client displays the Client IP address (if public) and Client RTT (Round Trip Time).
Note: Private IP addresses are not shown in the map view.
You can adjust the map in several ways:
  • Click to center the map.
  • Click the + (plus sign) to zoom in on the map.
  • Click the - (minus sign) to zoom out.

Total active connections: Displays the total number of active connections associated with the application.

Peak throughput: Displays the peak throughput of the application in the selected time period (displayed in the bottom-right of the Client Connections section).

Top request methods: Displays the top three HTTP request methods based on the data received from the LoadMaster logs (the request method with the highest value is shown at the top).
Note: The Top request methods and Highest server based on connections widget data is based on the Request logging feature which you can enable in the User Insights tab. The Request logging feature is only available for LoadMasters with version 7.2.60.0 and above.

Highest server based on connections: Displays the IP address of the servers with the top three total connections based on the data received from the LoadMaster logs (the server with the highest value is shown at the top).

Top client by throughput: Displays the IP addresses of the clients with the top three throughput based on data received from the Flowmon Collector (the client with the highest value is shown at the top).