Re: GPU Passthrough on FreeBSD 14.3 (AMD Radeon RX 6900 XT and Windows 10 Pro)

On Tue, Sep 16, 2025 at 10:29 PM Jonathan Vasquez <jon@xyinn.org> wrote:
> I wanted to update you on my progress on this. After some discussion with Corvin, I was able to use some of his insights to finally get it working :). There was only one thing that was off with my configuration that was causing it not to work at all, and that's that the "Resize BAR Support" option was enabled in my UEFI. Apparently FreeBSD doesn't support Resizable BAR and if this is enabled, then we won't know what will happen exactly if the host or the bhyve VM decides to resize the bar. After I turned that off, everything worked! I've done a full update of my instructions on how to get this working and I've also generated a new set of screenshots of multiple different games and benchmarks. Let me know your thoughts. I'm not familiar with Resize BAR, but my BIOS mentioned that it's to allow you "take full advantage of the GPUs memory", I'm guessing that there may be a significant performance drop due to this being disabled, but the performance is already pretty good. I was getting 40 fps pretty much consistently in Cyberpunk 2077 on Ray Tracing Low on 2560x1440p. The Heaven Benchmarks were getting 100-300 fps depending on the scene on DX11, Ultra Quality, Extreme Tessellation. Furmark also yielded 194-208 (avg: 201) fps for its 1440p benchmark test. This was all through RDP.
> (..)

Sounds really great! Would it be possible Jonathan that you put all
the instructions and hints into the Handbook so it is all on one place
info and up to date? :-)

-- 
CeDeROM, SQ7MHZ, http://www.tomek.cedro.info