[Mesa-dev] [PATCH 0/5] radeon: Write-combined CPU mappings of BOs in GTT

Christian König deathsimple at vodafone.de
Thu Jul 17 03:09:20 PDT 2014

Am 17.07.2014 12:01, schrieb Michel Dänzer:
> In order to try and improve X(Shm)PutImage performance with glamor, I
> implemented support for write-combined CPU mappings of BOs in GTT.
> This did provide a nice speedup, but to my surprise, using VRAM instead
> of write-combined GTT turned out to be even faster in general on my
> Kaveri machine, both for the internal GPU and for discrete GPUs.
> However, I've kept the changes from GTT to VRAM separated, in case this
> turns out to be a loss on other setups.
> Kernel patches:
> [PATCH 1/5] drm/radeon: Remove radeon_gart_restore()
> [PATCH 2/5] drm/radeon: Pass GART page flags to
> [PATCH 3/5] drm/radeon: Allow write-combined CPU mappings of BOs in
> [PATCH 4/5] drm/radeon: Use write-combined CPU mappings of rings and

Those four are Reviewed-by: Christian König <christian.koenig at amd.com>

> [PATCH 5/5] drm/radeon: Use VRAM for indirect buffers on >= SI

I'm still not very keen with this change since I still don't understand 
the reason why it's faster than with GTT. Definitely needs more testing 
on a wider range of systems. Maybe limit it to APUs for now?


> Mesa patches:
> [PATCH 1/5] winsys/radeon: Use separate caching buffer managers for
> [PATCH 2/5] r600g/radeonsi: Use write-combined CPU mappings of some
> [PATCH 3/5] r600g/radeonsi: Prefer VRAM for CPU -> GPU streaming
> [PATCH 4/5] r600g,radeonsi: Use write-combined persistent GTT
> [PATCH 5/5] r600g,radeonsi: Prefer VRAM for persistent mappings
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