You may see the above warning message when you compile the generated example design of the UniPHY-based DDR3 memory controller.
This warning will show up when users don't specify whether they are willing to have feedback and output paths differently.
Intel® Quartus® will try to match both paths with the same compensation path.
This warning can be fixed by setting the following QSF assignment:
set_instance_assignment -name MATCH_PLL_COMPENSATION_CLOCK OFF -to *