ISP Overload

What does this counter show?

The Image Synthesis Processor (ISP) is the part of the graphic core that fetches the primitive data and performs Hidden Surface Removal (HSR), along with depth and stencil tests. This counter indicates if this unit has become a bottleneck.

What does a high value mean?

An ISP overload event is quite rare, and occurs when one or several tiles have to process a large number of overlapped polygons (i.e. high overdraw). To avoid this situation, reduce the amount of geometry submitted to the GPU by performing visibility tests and culling on the CPU.