Dear Jetson Hardware Experts,
I am using the latest version of JetPack with a Jetson Orin NX 8GB and a custom carrier board.
This board includes a PCIe port, and I am able to communicate with another card.
However, I am experiencing bandwidth issues. The problem comes from the Max Payload Size.
By default, the value is set to 128, while the card supports up to 256.
After some research and several attempts, I modified the file /boot/extlinux/extlinux.conf by adding:
+ pci=pcie_bus_perf
startup_pcie_perf.txt (61.8 KB)
startup_pcie_safe.txt (55.9 KB)
This addition solves the issue, as shown in the dmesg output:
[ 7.238541] pci 0001:00:00.0: Max Payload Size set to 256/ 256 (was 128), Max Read Rq 256
[ 7.238656] pci 0001:01:00.0: Max Payload Size set to 256/ 512 (was 128), Max Read Rq 256
With this change, I recover the expected bandwidth, and data transfers work correctly.
However, I lose the Ethernet port, it no longer functions.
Is it possible to modify only the Max Payload Size assigned to my card without affecting other components ?
And where exactly should I make these modifications ?
Could you please provide further support on this ?
Thanks and best regards.