[Bug 104496] New: [GM45] asynchronous wait on fence i915:[global]:3268e timed out; critical performance loss minutes prior

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104496

            Bug ID: 104496
           Summary: [GM45] asynchronous wait on fence i915:[global]:3268e
                    timed out; critical performance loss minutes prior
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: promarbler14 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 136555
  --> https://bugs.freedesktop.org/attachment.cgi?id=136555&action=edit
drm.debug=0x1f kernel log during critical performance loss

Arch Linux x86_64

linux-drm-tip-git 4.15rc6+1282+g5f40895798ad+724923-1
xorg-server 1.19.6-2
mesa 17.3.1-2
libdrm 2.4.89-1
xf86-video-intel 1:2.99.917+804+g708255cb-2 (w/o debug)

Get the following warning in the kernel log: asynchronous wait on fence
i915:[global]:3268e timed out

The actual issue is the alt-tabbing away from a fullscreen Minecraft window
while it is actively rendering will cause critical performance issues. It'll
minimize... but slowly and without redrawing everything. Sometimes the
performance effect is delayed. After that, the desktop and any VT-switching is
horrendously slow (on the order of several seconds to nearly a minute), forcing
me to kill the minecraft program. Even after killing it, it takes a few seconds
for the graphics to respond again. After switching to a linux console,
performance is fine, having no extreme CPU or RAM usage.

The attachment has a drm.debug=0x1f kernel log. While it didn't seem to capture
the warning in this attempt, the critical performance loss is still there. It
starts at around 14:02 and lasts for about 8 minutes.

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