[Bug 218525] Thunderbolt eGPU bad performance

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218525

--- Comment #10 from Kaukov (kaukov.peter@pm.me) ---
> There's like a 3% difference between Windows and Linux results for this
> benchmark though Windows has two times better min fps.

Yes, but that is a one-off case. The performance otherwise is abysmal.

> First is that the real PCIe link to the 06:00 eGPU device is running on
> limited bandwidth:

This automatically adjusts to 8GT/s, Width x4 when actively using the eGPU. On
AMD I couldn't get it to run past 2.5GT/s but I'll try with the new kernel
parameters when I have an AMD GPU at hand.

After further testing and setting `pcie_aspm.policy=performance` and
`intel_iommu=off`, nothing changed. The performance in games is still abysmal
and unplayable. I'll attach my lspci and dmesg logs again, after running
Baldur's Gate 3 via Proton Experimental and on DX11.

Could this be a Wine/DXVK/Vulkan issue and not a kernel issue? Although OP
stated that when running via a PCIe M.2 x4 link no issues occur.

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