[Bug 101278] Severe slowdown on Shadow of Mordor between 17.1.0 and 17.1.1

[Bug 101278] Severe slowdown on Shadow of Mordor between 17.1.0 and 17.1.1

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https://bugs.freedesktop.org/show_bug.cgi?id=101278

            Bug ID: 101278
           Summary: Severe slowdown on Shadow of Mordor between 17.1.0 and
                    17.1.1
           Product: Mesa
           Version: 17.1
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: nagrigoriadis@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Shadow of Mordor slowed down significantly for me on my notebook between Mesa
17.1.0 and 17.1.1

My system:
Gentoo Linux 64-bit
Dell Precision M4700
Intel i7-3720QM quad-core
16 Gig RAM
AMD FirePro M4000 (Cape Verde, 512su, 1GB DDR5 RAM, 675Mhz)

I then did a bisect to find the commit where the slowdown happened (used the
built-in benchmark tool manually, some custom medium-low settings):
35ec26bb00536639b9571f31d8e3f2bcbcfc32fb 30.31fps
ad3b5b7f5f7590fd4359ea3483e2309e4cebc472 18.12fps

So the commit that causes the big slowdown:
https://cgit.freedesktop.org/mesa/mesa/commit/?h=17.1&id=ad3b5b7f5f7590fd4359ea3483e2309e4cebc472
seems to be specific to SI, but appears to fix an issue in tessellation.
I double-checked, and tessellation is off in the game settings, so I'm
surprised this caused a performance difference.

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[Bug 101278] Severe slowdown on Shadow of Mordor between 17.1.0 and 17.1.1

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https://bugs.freedesktop.org/show_bug.cgi?id=101278

--- Comment #1 from nagrigoriadis@gmail.com ---
Apologies, I forgot some important related details:

I'm on kernel 4.11.1-gentoo right now, but observed the same on 4.10.8
libdrm-2.4.80
llvm-4.0.0-r2
xorg-server-1.19.3
xf86-video-ati-7.9.0
using the "radeon" kernel module.

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[Bug 101278] Severe slowdown on Shadow of Mordor between 17.1.0 and 17.1.1

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https://bugs.freedesktop.org/show_bug.cgi?id=101278

Nicolai Hähnle <nhaehnle@gmail.com> changed:

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

--- Comment #2 from Nicolai Hähnle <nhaehnle@gmail.com> ---
Should be fixed in master since commit 391673af7a.

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[Bug 101278] Severe slowdown on Shadow of Mordor between 17.1.0 and 17.1.1

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https://bugs.freedesktop.org/show_bug.cgi?id=101278

nagrigoriadis@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #3 from nagrigoriadis@gmail.com ---
Thanks Nicolai for your quick action.

I first built the latest git master: 2e28e8b199abab76fa9509d3247b44a2cb31921d
But everything was green, and the game would crash in the menu.

I then built 391673af7ad1565a5f6ac8fc2f8c9fcdd1fe9908
And it worked, but performance is still in the regressed state :-(

The thing is, tessellation was off this whole time.

Please advise?

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[Bug 101278] Severe slowdown on Shadow of Mordor between 17.1.0 and 17.1.1

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https://bugs.freedesktop.org/show_bug.cgi?id=101278

--- Comment #4 from Nicolai Hähnle <nhaehnle@gmail.com> ---
Created attachment 131949
  --> https://bugs.freedesktop.org/attachment.cgi?id=131949&action=edit
Patch making the conditions even tighter

Odd. Maybe the game lies to you about tessellation being off? Anyway, could you
please try the attached patch?

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[Bug 101278] Severe slowdown on Shadow of Mordor between 17.1.0 and 17.1.1

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=101278

--- Comment #5 from Nicolai Hähnle <nhaehnle@gmail.com> ---
Created attachment 131950
  --> https://bugs.freedesktop.org/attachment.cgi?id=131950&action=edit
Alternative patch

If the patch from the previous comment works, could you please also try this
patch as an alternative? Thanks!

If neither work, could you please provide an apitrace?

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[Bug 101278] Severe slowdown on Shadow of Mordor between 17.1.0 and 17.1.1

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https://bugs.freedesktop.org/show_bug.cgi?id=101278

Timothy Arceri <t_arceri@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|REOPENED                    |RESOLVED

--- Comment #6 from Timothy Arceri <t_arceri@yahoo.com.au> ---
No reply so assuming fixed and closing.

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