On Tue, Mar 20, 2018 at 4:16 PM, Christian König <christian.koenig-5C7GfCeVMHo@public.gmane.org> wrote:

That's what I meant with use up the otherwise unused VRAM. I don't see any disadvantage of always setting GTT as second domain on APUs.

My assumption was that we dropped this in userspace for displayable surfaces, but Marek proved that wrong.

So what we should do is actually to add GTT as fallback to all BOs on APUs in Mesa and only make sure that the kernel is capable of handling GTT with optimal performance (e.g. have user huge pages etc..).

VRAM|GTT is practically as good as GTT. VRAM with BO priorities and eviction throttling is the true "VRAM|GTT".

I don't know how else to make use of VRAM intelligently.

Marek

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