Re: [PATCH 0/3] drm/amdgpu: Tweaks for high pressure on CPU visible VRAM

["Marek Olšák" <maraeo-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Hi Michel,

I've applied your series and it doesn't help with low Dirt Rally
performance on Fiji. I see TTM buffer moves at 800MB/s and many VRAM
page faults.

Marek

On Thu, May 18, 2017 at 11:08 AM, Michel Dänzer <michel@daenzer.net> wrote:
> From: Michel Dänzer <michel.daenzer@amd.com>
>
> This series was developed and tested under the following scenario:
>
> Running the PTS dirt-rally benchmark (1920x1080, Ultra) on Tonga with
> 2G, with CPU visible VRAM artificially restricted to 64 MB.
>
> Without this series, there's a lot of stutter during about the first
> minute of a benchmark run. During this time there are significant amounts
> of buffer moves (starting from about 500 MB on the HUD) and evictions,
> gradually declining until the buffer moves settle around 8 MB on the HUD.
>
> With this series, there's only slight stutter during the first seconds
> after the car launches, even though the buffer move volume is about the
> same as without the series. Buffer evictions are eliminated almost
> completely, except for a few at the beginning. Buffer moves still settle
> around 8 MB on the HUD, but with less variance than before.
>
> Note that there's only little if any improvement of the average framerate
> reported, but the minimum framerate as seen on the HUD goes from ~10 fps
> to ~17.
>
>
> Patch 1 is a cleanup that I noticed along the way.
>
> Patch 2 makes the main difference for the above scenario.
>
> Patch 3 doesn't make as much difference, I'm fine with it not landing at
> least for now.
>
> Michel Dänzer (3):
>   drm/amdgpu: Drop useless loops for placement restrictions
>   drm/amdgpu: Don't evict other BOs from VRAM for page faults
>   drm/amdgpu: Try evicting from CPU visible to invisible VRAM first
>
>  drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 42 ++++++++++++---------------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c    | 46 ++++++++++++++++++++----------
>  drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c    |  6 +---
>  3 files changed, 51 insertions(+), 43 deletions(-)
>
> --
> 2.11.0
>
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