[Bug 218525] Thunderbolt eGPU bad performance

[bugzilla-daemon@kernel.org]

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

Benjamin (benjamin.sabatini@gmail.com) changed:

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                 CC|                            |benjamin.sabatini@gmail.com

--- Comment #15 from Benjamin (benjamin.sabatini@gmail.com) ---
(In reply to Mika Westerberg from comment #13)
> Okay with this you have ASPM disabled:
> 
>               LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+
>                       ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
>               LnkSta: Speed 2.5GT/s (downgraded), Width x4 (downgraded)
>                       TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
> 
> However, the link speed is now at gen 1 but I guess that gets adjusted then
> as you mentioned. I suggest to check that when you play some affected game
> that it actually runs at the 8GT/s x 4.
> 
> One more thing comes to mind but you probably checked it already. The game
> may not be using the eGPU and instead it is running on the internal one.
> With the Unigine benchmark it clearly used the eGPU.

Hello. I'm just confirming the issue over TB4 on a Lenovo Z13 laptop and RX
7600 XT in an eGPU setup using the same kernel parameters as workarounds
(amd_iommu=off instead). It never pulls more than ~50 watts and maybe ~2000MHz
on the GPU and ~400 MHz on the VRAM.

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