Appendix A Visualrf Performance; Floor Specific Elements Impacting Visualrf Performance; Identifying Performance Problems; Resolving Performance Problems - Dell PowerConnect W-Airwave User Manual

The first place to check for performance issues is the VisualRF > Floor Plans page. If any floor's location
calculation duration exceeds the location caching timer value configured on VisualRF > Setup, then VisualRF is
not able to calculate locations for clients per your desired interval.

Floor Specific Elements Impacting VisualRF Performance

Number of clients - VisualRF calculates location for every client associated with access points on the floor per

the value of location calculation timer. Hundreds or thousands of clients on a floor may cause location
calculations for that floor to take minutes instead of seconds.
Dimensions of floor plan - VisualRF calculates path loss for every radio to every cell on the floor plan. If the

floor is 2,000 feet by 1,500 feet and grid cell size is 5 x 5 and there are 50 dual radio access points, then
VisualRF will need to make 12,000,000 path loss calculations (400 cells * 300 cells * 100 radios).
Number of APs/Radios on a floor plan - VisualRF calculates path loss for every radio to every cell on the floor

plan.
Floor plan image size - the bigger the file size the longer the floor will take to render.

Number of Rogue devices on a floor plan - VisualRF calculates location for every rogue device heard by APs on

the floor per the value of the rogue calculation timer.

Identifying Performance Problems

Ensure all floors are calculating locations per specifications - navigate to the VisualRF' Floors page.

Check Memory Utilization - navigate to the System' Performance page and locate System Memory Usage

graph. Ensure there is free memory. Check trending after adding new floors or making change to the VisualRF
' Setup page.
Check Swap Utilization - navigate to the System' Performance page and locate the System Swap Usage graph.

Ensure the server is not swapping.
Check System CPU Utilization - navigate to the System' Performance page and locate System CPU

Utilization graph. Ensure the server has average idle time.
Check System Load Average - navigate to the System' Performance page and locate the System Load Average

graph. Ensure that load average is below 2 times the number of cores. For example if you have a dual-core
server, the average load time should be at or below 8.

Resolving Performance Problems

Floor location calculation duration exceeding Client Location Timer
Migrate to faster hardware

Increase Core Caching Threads

Increase Location Caching Threads

Decrease the Location Caching Timer

Increase Grid Cell Size

Dell PowerConnect W AirWave 7.2 | VisualRF User Guide
Appendix A
VisualRF Performance
VisualRF Performance | 45