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Performance metrics

  • Published on Oct 5, 2026
  • 3 minute(s) read
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View Throughput Usage

View Device Throughput Usage

You can view the Sensor throughput usage for the selected device. The unit used for plotting the charts is percentage. Each Sensor is rated for an official maximum throughput, and the throughput usage data displayed in the charts is a percentage of that maximum throughput. Sensors can max out above that maximum rating depending on the type of traffic.

Note

The maximum number of records displayed for a selected device is 10,000.

From the 11.1 Update 9 release, the unit used for plotting the charts is Mbps. This functionality is supported on NS3600, NS7500, NS7600, NS9500, NS9600, IPS-VM600, IPS-VM600-SSL, IPS-VM5000, and IPS-VM5000-SSL Sensors. The Maximum, Average, or Minimum summarized data are replaced with Average and Peak values. Additionally, the data update frequency has improved from every 3 minutes to every 30 seconds.

Device Throughput Usage
Device Throughput Usage


View Port Throughput Usage

You can view the port throughput usage for a specific interface depending on the device selected. The unit used for plotting the charts is Mbps. Device throughput data is displayed by default. To view data for port throughput, select Port Throughput Usage from the drop-down list.

To view the port throughput for a particular or multiple interfaces, select the interfaces displayed at the bottom of the charts. To hide the throughput for an interface, deselect that specific interface. For any selected interface, you can view the details of Port <port number> (Interface: <interface name>), Port throughput rate in Mbps and time in MMM DD HH:MM:SS YYYY.

Note

From the 11.1 Update 9 release, you can view the Average and Peak port throughput values for NS3600, NS7500, NS7600, NS9500, NS9600, IPS-VM600, IPS-VM600-SSL, IPS-VM5000, and IPS-VM5000-SSL Sensors.

Port Throughput Usage
Port Throughput Usage


View the Memory usage

You can view the memory usage which helps monitor the usage before reaching the threshold limit. The unit used for plotting the charts is percentage. The following metrics are displayed:

  • Flow pool — The percentage of memory allocated to inspect all flows. This is the default metric.

  • Decrypted Flow Pool — The percentage of memory allocated to inspect decrypted SSL flows

  • Packet Buffers — The percentage of the packet buffer used by the Sensor

  • System Memory — The percentage of the system memory used by the Sensor

Memory Usage
Memory Usage


View the CPU Usage

CPU usage is the usage that represents the combined usage of software processing in the datapath along with the throughput usage in the Sensor. You can view the device CPU usage which helps monitor the CPU usage before it reaches the threshold limit. The unit used for plotting the charts is in percentage.

Note

By default, a fault message will be generated if the CPU usage goes beyond 90%.

CPU Usage
CPU Usage


The Actions menu at the bottom of the page allows you to perform the following actions:

  • Save as Image File (PNG) - This allows you to save the charts as an image file in SENSORNAME-METRIC_Performance-YYYYMMDD_hhmm.PNG format.

  • Manage Performance Metric Collection - This opens the Devices → Setup → Performance Monitoring → Summary page.

  • Manage Performance Data Storage - This opens the Manager → Maintenance → Database Pruning → File and Database Pruning page.

Note

This option is available only if you have access to the Manager menu.

View the Packet usage

You can view the number of packets transferred within a specified time frame. By default, the system displays device-level packet data. To access port-specific data, select Port from the available drop-down menu.

You can customize your view of network packets by selecting or deselecting any of the five available size ranges: Total, 0-64, 65-127, 128-255, and 256-511. By default, all ranges are displayed. For any chosen interface, the system displays the number of packets in the format: <device name>, <number> packets of <packet size range>, and time in MMM DD HH:MM:SS YYYY.

Packets usage
Packets usage


Note

From the 11.1 Update 9 release, you can view the Packets tab for NS3600, NS7500, NS7600, NS9500, NS9600, IPS-VM600, IPS-VM600-SSL, IPS-VM5000, and IPS-VM5000-SSL Sensors.

View the Inspection Time usage

You can monitor the total inspection time, along with the inspection time contributed by each of the top 5 contributors. By default, the system does not display the top five contributors to this delay. To enable the visibility of these top five contributors, select the Top 5 Contributors checkbox.

For any chosen interface, the system displays the inspection time in the format: <device name>, <time in microseconds> Inspection Time <contributor details>, and time in MMM DD HH:MM:SS YYYY.

Inspection Time usage
Inspection Time usage


Note

From the 11.1 Update 9 release, you can view the Inspection Time tab for NS3600, NS7500, NS7600, NS9500, NS9600, IPS-VM600, IPS-VM600-SSL, IPS-VM5000, and IPS-VM5000-SSL Sensors. Inspection Time applies only to inline ports; in SPAN mode, the value is 0s.

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