Re: [gentoo-user] agpgart, radeon and amdgpu kernel modules

[Michael <confabulate@kintzios.com>]

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On Monday, 3 March 2025 12:18:34 Greenwich Mean Time gevisz wrote:
> Mon, 3 March 2025 in 12:45, Michael <confabulate@kintzios.com>:

> > Both the old AGP and the new(er) PCIe graphics cards
> > use GART to manage graphics processing.
> 
> Does it mean that the agpgart module is needed even
> I have only an AMD/ATI RV740 PRO Radeon HD 4770
> that is connected to the PCI Express bus?

I don't know much about graphics, or your specific card, but know PCIe cards 
use GART to access system memory (IOMMU) and AMD in particular uses this for 
virtualisation too.  If it is being loaded as a module I would guess your 
driver needs it and this will confirm it:

$ dmesg | egrep -i 'GART|IOMMU'

You can always experiment by unloading it and trying some intensive graphics 
application, while checking dmesg to see if it is complaining about missing 
graphics modules.  You can try comparative runs on unigine heaven or one of 
the browser graphics benchmarks and see what results you get.


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