https://bugs.freedesktop.org/show_bug.cgi?id=107670
--- Comment #14 from Michel Dänzer <[email protected]> ---
(In reply to iive from comment #13)
> Of course, reading from PCI is slow, not cached; and in this exact case also
> completely unnecessary.
Right, reading from uncacheable memory can certainly explain the slowness.
> It looks to me like the data is first moved ram->vram using dma, then
> vram->vram using CPU...
No. u_upload_data is for copying data from normal system memory into GPU
accessible memory. (You're comparing physical and virtual memory addresses, AKA
apples and oranges :)
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