[Bug 90741] New: Radeon: System pauses on TAHITI

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=90741

            Bug ID: 90741
           Summary: Radeon: System pauses on TAHITI
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.18.0 3.18.1
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: wielkiegie at gmail.com
        Regression: No

The system freezes for 1-3 seconds from time to time. No message is shown in
dmesg. Some of the programs report high display delays in their profiles (maybe
glXSwapBuffers?). The pause is system-wide, probably due to whole-OpenGL stack
(glamor).

This seems to be a 3.18.x regression. The problem does not occur on 3.17.4.

During normal usage the problem is very rare. However, it occurs very often
while playing OpenGL games.

For games like Minecraft, the pauses are less likely while not moving around. I
believe that the game does not upload many buffers then. So the issue may be
due to buffer management.

I am using mesa from git, libdrm from git, xserver 1.16.2.901, xf86-video-ati
7.5. The problem occurs both with compositing enabled and disabled (kwin).

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