[Bug 101978] [bisected] war thunder performance reduced by ~28%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101978

            Bug ID: 101978
           Summary: [bisected] war thunder performance reduced by ~28%
           Product: Mesa
           Version: git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: higuita at gmx.net
        QA Contact: dri-devel at lists.freedesktop.org

Since sometime i notice that war thunder is running slower on my machine using
mesa-git, but as the game is always updating, i (wrongly) blamed some game
update. 

Yet, some days ago, after a test with a steamOS, i could confirm that older
mesa versions worked faster than mesa-git, with the same game version. I
excluded the kernel version, so i have done a mesa bisect and found the (old)
commit that made war thunder lost about 28% performance on my setup (RX480 on a
A10-7850k):

commit ac6007460adaf4bb21028a3281ec622d1e43df49
Author: Marek Olšák <marek.olsak at amd.com>
Date:   Wed Feb 15 19:50:15 2017 +0100

    radeonsi: upload constants into VRAM instead of GTT

    This lowers lgkm wait cycles by 30% on VI and normal conditions.
    The might be a measurable improvement when CE is disabled (radeon)
    or under L2 thrashing.


I'm running slackware64 -current, with kernel 4.12.1, LLVM 4.0.1 and the game
is free, so you can test it. For the bisect i started the game, run the CPU
benchmark (as workaround some bug where most first benchmarks are slower) and
then run the  "still scene" benchmark. as is the shorter one, but all others 
had performance drop.

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