Am 18.07.2014 05:07, schrieb Michel Dänzer:
On 17.07.2014 19:09, Christian König wrote:
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.koe...@amd.com>
Thanks!
[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.
Sure. If anyone wants to give this patch a spin and see if they can
measure any performance difference, good or bad, that would be
interesting.
Maybe limit it to APUs for now?
But IIRC, CPU writes to VRAM vs. write-combined GTT are actually an
even
bigger win with dedicated GPUs than with the Kaveri built-in GPU on my
system. I suspect it may depend on the bandwidth available for PCIe vs.
system memory though.
Michel,
please, please do NOT change anything on this!;-)
You all know that I currently can only run this on my poor Duron 1800
with RV730 (AGP), but...
With this all 'objview' demos (mesa-demos) run at 60 fps (vsync),
even with chip set/CPU power management enabled (athcool on).
If I set vblank_mode=0
the slowest GreatLakesBiplaneHP.obj
run at ~100 fps (~16 fps before) => 6x speedup.
(Even 5 planes run at 30 fps) - Wow!!!
'buddha' went from ~40 fps up to ~175 fps
'bunny' went from ~60 fps up to ~215 fps
'bobcat' show not such a big improvement 'only' 70 fps more
R600_HYPERZ=1
help somewhat, too but not in all cases.
Overall X/Kwin eXperience is much better.
Let me know which benchmarks you need.
Cheers,
Dieter
BTW Do anyone know how I can override BIOS GTT settings?
I can only set 256 MB max. - BIOS patching?
With agpmode=-1 I can run with 1024 MB GTT
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