In our application, we would need to change the max_payload setting in BIOS for the PCIe bus. I understand that the value can range from 128 to 4096 bytes. we are interested in setting it to 4096 Bytes. However, I do not see such an option in BIOS, but from testing, we notice the MB is taking 256 Byte as the default/max value. 

Could you let me know what is the roadmap on enabling the max_payload for PCIe bus and what is the max number? 

Thanks,

FHT 

You probably won't see ( TLP ) Max payload,  anymore. Not after the LGA 1366.  That was the day's when there was a north and south bridge. Now with the north on the CPU and a South- chipset,  and much higher lanes, they are more likely set to max default as there is no reason to limit them with what they can transfer now.  Before,   the root port could be flooded with data and cause crashing.