[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

            Bug ID: 103175
           Summary: R9285 Unreal tournament perf regression with agd5f
                    4.15-wip kernels possibly CPU related
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: adf.lists@gmail.com

Created attachment 134765
  --> https://bugs.freedesktop.org/attachment.cgi?id=134765&action=edit
good perf gallium hud on 4.14 kernel.

R9285 Tonga, Compared to older kernels I have a perf regression with latest
4.14.0-rc3 based and previous 4.13-rc5 based agd5f 4.15-wip kernels.

This doesn't seem to affect other things like xonotic or unigine demos.

Issue = on fixes 4.14 and other older kernels I've tried, the game is OK ish
perf wise, 25-60 fps.

On 4.15-wip its 10fps. Using HUD one obvious difference is that the slow case
is only mostly using one cpu core, on a good kernel all 4 of my old phenom 2 x4
are used - possible red herring of course, I'll upload some screenshots.

The game is pre-alpha and doesn't always render properly - but it was vaguely
playable fps wise until this kernel.

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[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

--- Comment #1 from Andy Furniss <adf.lists@gmail.com> ---
Created attachment 134766
  --> https://bugs.freedesktop.org/attachment.cgi?id=134766&action=edit
bad on previous 4.15 kernel cpu load different.

All tests done with both CPUs and GPU forced to perf.

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[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

--- Comment #2 from Andy Furniss <adf.lists@gmail.com> ---
Created attachment 134767
  --> https://bugs.freedesktop.org/attachment.cgi?id=134767&action=edit
bad on latest 4.15-wip cpu still different but not as obvious.

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[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
According to the HUD, the GPU load is actually higher in the bad cases. Have
you checked what clocks the GPU runs at in each case?

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[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

--- Comment #4 from Michel Dänzer <michel@daenzer.net> ---
https://cgit.freedesktop.org/~agd5f/linux/commit/?h=amd-staging-drm-next&id=e5f6a57e350a7921e4edc30874679bdff11b13f4
might help.

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[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

--- Comment #5 from Andy Furniss <adf.lists@gmail.com> ---
I had that fix and a couple of others on the first 4.15-wip I tried. They are
in now AFAICT. I see Alex updated again since yesterday so I'll try that one
later.

I did notice but forgot to highlight the GPU difference.
Given all the powerplay changes in 4.15-wip I do wonder if all is well but I
would have expected Unigine/Xonotic to show it if something was wrong there.

One thing different about UT is it asks for more vram than I have, maybe that
makes it stand out from other tests.

After posting this I did wonder whether the CPU difference is just because the
fps is low and not the cause.

4.15-wip doesn't work for me going away from head (will throw  some vmfaults
and then lock soon after startx) so bisecting is not an easy option.

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[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

--- Comment #6 from Andy Furniss <adf.lists@gmail.com> ---
I tried latest 4.15-wip and it's still low perf.
On this test the perf was OK ish initially but degraded over the first 20
seconds.

For added hassle it seems that between 4.13 and 4.14-rc1 something changed that
means I may hard lock when configuring ffmpeg! I am trying to find that one on
linus git, but now agd5f have been rebased they are not stable for me.

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[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

--- Comment #7 from Andy Furniss <adf.lists@gmail.com> ---
This is OK now with amd-staging-drm-next, I'll close when 4.15s get updated
assuming they get whatever fixed it as well.

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[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

--- Comment #8 from Andy Furniss <adf.lists@gmail.com> ---
It's not OK, I don't know what happened there, maybe I wasn't in the kernel I
thought, though I am not convinced.
Whatever the reason, I can't get it to work now.

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[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

--- Comment #9 from Andy Furniss <adf.lists@gmail.com> ---
possibly this is

https://bugs.freedesktop.org/show_bug.cgi?id=103100

Though I am not sure as I lock soon after startx if on the commit called there

On the commit before I am OK and UT perf is good.

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[Bug 103175] R9285 Unreal tournament perf regression with agd5f 4.15-wip kernels possibly CPU related

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https://bugs.freedesktop.org/show_bug.cgi?id=103175

Andy Furniss <adf.lists@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #10 from Andy Furniss <adf.lists@gmail.com> ---
Testing from head of drm-next-4.15 I can change minor to 19 and 20 in
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
and am stable so can test.

19 gives good perf 20 bad, so setting as duplicate.

*** This bug has been marked as a duplicate of bug 103100 ***

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