Hello NVIDIA community,
I have a question regarding the MaxPayload configuration on my NVIDIA GPU.
When I check the MaxPayload capacity via the PCIe configuration space, it shows that the maximum supported payload size is 256 bytes. However, I found that I can manually configure the MaxPayload to 1024 bytes by modifying the register, and interestingly, the GPU continues to operate normally with no noticeable issues or crashes.
My questions are:
- Why is the MaxPayload capacity reported as 256 bytes, but it’s possible to configure it to 1024 bytes via registers?
- What are the potential risks of manually increasing MaxPayload to a larger size than what’s reported?
I understand that increasing the MaxPayload size can theoretically improve performance by reducing overhead, but I want to ensure that it’s safe to configure it beyond the reported limits.
Any insights or technical explanations on this behavior would be greatly appreciated.
Thank you!