[Bug 97593] [amdgpu SI] low performace, low (about 1/4) VRAM usage

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97593

            Bug ID: 97593
           Summary: [amdgpu SI] low performace, low (about 1/4) VRAM usage
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: arek.rusi at gmail.com

Created attachment 126201
  --> https://bugs.freedesktop.org/attachment.cgi?id=126201&action=edit
screenshot from unigine-heaven

Hi, I've tried amdgpu driver for SI and GL apps run much slower than for
radeon.
Unigine-Heaven drops from 20 fps to 8 fps
VRAM usage ~ 200MB
requested VRAM ~500MB
GTT usage ~ 500MB 
Look at the screenshot for more.

drm-next-4.9-wip: 48fad3aff638c7bc16656e31047f689aa44020a1 
xorg-git
mesa-git:98f734e
llvm-svn:280612
libdrm:4462303 + 2 patches for SI support from amd-gfx's list

I used unigine-heaven benchmark for first shot but more apps in affected:
Alien Isolation
Shadow of Mordor
Bioshock Infinite
Metro 2033 Redux
XCOM
The Witcher 2
xonotic (for quality "low" performance is normal) 
In fact only glxgears, lightsmark, gputest(all),openarena are not affected :) 

In any case VRAM-usage isn't raised over a 250MB but dmesg & xorg logs are
different for each games, I will try update the logs later.
I've tested it with dpm=1, but dpm=0 makes nothing.

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