For people (like me) who don’t know what a resizeable BAR is and whether or not they want one: https://www.pcguide.com/gpu/what-is-resizable-bar/

  Resizable BAR (Base Address Register) is a PCIe capability. This is a mechanism that allows the PCIe device, such as a discrete graphics card, to negotiate the BAR size to optimize system resources. Enabling this functionality can result in a performance improvement.

Great project, but emphasis on Almost[0].

It will not work in the one computer where I need it; On Haswell, 32GB RAM + 16GB BAR is currently not possible[1].

0. https://github.com/xCuri0/ReBarUEFI/wiki/Common-issues-(and-...

1. https://github.com/xCuri0/ReBarUEFI/issues/20

A shame that the one machine I have that I wish to use ReBar on I cannot. The Mac Pro 2019 has a complicated PCI-E topology with PCI-E switches (all bar 2 PCI-E slots on the system go via the PCI-E switch topology) and no ability to tune/enable settings like sub-numa clustering or ReBar. Paired with a signed EFI and the T2 controller things look bleak for getting the most performance out of that system.

It would be pretty neat to get the most out of an NVIDIA GPU in Linux on this platform

As much as I’d like to get resizable bar on my Turing GPU, the amount of homegrown “this might work” patching necessary is really off putting.