Does IGX PCIe support the Resize BAR feature?

Autonomous Machines IGX Orin Support Forum IGX Developer Kit
1

Hi
We need to use IGX to connect to the PCIe RTX A4000 GPU.
We want to do rdma, so we need to enable the Resize BAR feature.

3

Hi bedrockjie,

As my understanding, IGX can only support RTX A6000 and RTX 6000 ADA discrete GPU.
Please refer to GPU Configurations - NVIDIA Docs for details.

4

oh okay
I did not find any information about PCIe reseize BAR configuration in the document.
Does IGX support it?
We need BAR1 to have a relatively large space, for example, 40GB, to use RDMA.

5

I’ve checked this with internal that Resizable BAR is EP(GPU) feature not RP(Tegra PCIe)
Linux subsystem has this support. If GPU supports it then should work fine.

You can refer to Specifications | PCI-SIG (pcisig.com) for Resizable BAR Capability.

It seems your RTX A4000 supports this, and you can also refer to the following topic.
A4000 Resizeable Bar support - #2 by MarkusHoHo