[H2D Bandwidth] H2D Bandwidth Degradation Due to Suboptimal MaxReadReq
Symptom
The H2D bandwidth does not meet the expectation, but the D2H bandwidth is normal.
Possible Causes
The MaxReadReq value is too small.
Check Method
Run the lspci -s ${NPU BDF number} -vvv command to check whether the MaxReadReq value is too small.
Solution
Adjust the MaxReadReq value, for example, by running the setpci -s ${NPU BDF number} 0x48.w=0x5137 command.
Parent topic: Bandwidth Test