[Mesa-dev] [Bug 111611] Launching LibreOffice with Panfrost and modesetting DDX cause rendering slowdown

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111611

            Bug ID: 111611
           Summary: Launching LibreOffice with Panfrost and modesetting
                    DDX cause rendering slowdown
           Product: Mesa
           Version: git
          Hardware: ARM
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: not set
         Component: Drivers/Gallium/Panfrost
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: russianneuromancer at ya.ru

Hello!

I found that launching LibreOffice Writer with default modesetting DDX and
Panfrost driver cause Xorg process to take 100% of one SoC core and slowdown
rendering significantly. Mutter render one frame per 5-15 seconds, so it's
unusable until I close LibreOffice Writer (sometimes I had to do it remotely as
doing so locally is painfully slow).

Software:
Ubuntu Eoan with Armbian 5.3.0-rc4-rk3399 kernel, which was built from
5.3.0-rc4-1118-ayufan tag of
https://github.com/ayufan-rock64/linux-mainline-kernel repository.
Mesa 19.3.0 git (build from commit f8887909c6683986990474b61afd6d4335a69e41)
with enabled Panfrost, from Oibaf PPA.
Gnome Shell 3.34 Beta.

glxinfo -B report "direct rendering: Yes" and "OpenGL vendor/renderer string:
panfrost"
es2_info report GL_RENDERER: panfrost

Both of glxgears and es2gears_x11 run at ~60 fps.

Hardware:
NanoPC-T4 with active cooling.

Please let me know what information I can provide to help resolve this.

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