New Question
PRTG Network Monitor

Intuitive to Use.
Easy to manage.

300.000 administrators have chosen PRTG to monitor their network. Find out how you can reduce cost, increase QoS and ease planning, as well.

Download >>


What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general. You are invited to get involved by asking and answering questions!

Learn more


Top Tags

View all Tags

Which settings do you recommend for best Toplist performance?



Your Vote:



With regards to Toplists of xFlow/Packet Sniffer sensors, is it better to reduce the toplist interval, or the top count, or a combination of both?

jflow netflow packet-sniffer performance prtg settings sflow toplist xflow

Created on Jan 9, 2013 3:42:42 PM by  Gerald Schoch [Paessler Support]

1 Reply

Accepted Answer



Your Vote:



This article applies to PRTG Network Monitor 12 or later

Recommended Settings for Best Toplist Performance

A recommendation for specific settings depends on the particular load you want to reduce.

  • The main load is caused by the number of flows; this factor cannot be influenced by the configuration on your xFlow router/switch.
  • The Period (minutes) setting determines for how long data is collected before a toplist is generated. The longer the period, the less toplists will be generated. To ease server load, we recommend using long periods, if you can. However, more memory will be consumed when collecting data in longer periods, depending on the network and the type of toplist, since the probe collects data for a longer time span.
  • The Top Count determines how much data is forwarded from the probe to the core (this is relevant when using remote probes in a WAN) and then is to be stored on the hard disk. Thus, the top count defines the size of each individual toplist.

Conceivably, the best mix of these options regarding the performance of toplists is to add as few toplists as possible and to turn off live listing, i.e. choose the option Wait until toplist period ends in the data transfer settings when experiencing high bandwidth usage. We further recommend 15 minutes toplist periods and a top count of 50 for high loads.

Created on Jan 9, 2013 4:14:22 PM by  Gerald Schoch [Paessler Support]

Last change on Jan 10, 2013 4:34:18 PM by  Gerald Schoch [Paessler Support]

Please log in or register to enter your reply.

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.