Description
This rule checks the amount of cascade stalls for AI Engine tiles.
Default Threshold
20.0
Explanation
Reducing cascade stalls can improve AI Engine performance. Time AI Engine was in a cascade stall. This could be due to multiple reasons such as cascade streams being read faster than they are written to streams from the PL being clocked at a slower frequency, etc.
Recommendation
See Performance Analysis of AI Engine Graph Application during Simulation in AI Engine Tools and Flows User Guide (UG1076) for AIE_CASCADE_STALLS.
You can resolve the stall by examining stream access patterns using trace results and adjusting the instructions in the loop to match between the input/output streams or maximizing the PL bandwidth to the AI Engine.
- Adjust instructions in the loop.