[Bug 47491] New: dinput event queue is overflowing and stalling the whole game/wineserver

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=47491

            Bug ID: 47491
           Summary: dinput event queue is overflowing and stalling the
                    whole game/wineserver
           Product: Wine
           Version: 4.2
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: directx-dinput
          Assignee: wine-bugs at winehq.org
          Reporter: stefan.riesenberger at gmail.com
      Distribution: ---

Created attachment 64873
  --> https://bugs.winehq.org/attachment.cgi?id=64873
Achive with a +dinput log of 125hz and 1000hz pollrate mouse movement

The game tested was Borderlands 1 Enhanced Edition via Proton (not a Proton
issue though), because it is one of the most severe examples of this issue. The
game completely freezes when moving the mouse with the pollrate set to 1000Hz.
It only unfreezes when the mouse isn't moving anymore. This issue occurs in
multiple games resulting in huge framedrops when moving the mouse. A temporary
workaround is to set the mouse pollrate to 125Hz, but it's not a real solution
to the problem.

As already mentioned in the title the event queue of dinput is constantly
overflowing which blocks anything else running on the wineserver. I attached 2
logs with +dinput. Both were recorded for the same amount of time, one
containing the overflow with 1000Hz and one recorded at 125Hz.

My guess is that this problem occurs due to the single threaded nature of
wineserver and the huge amount of input data that arrives from the mouse. The
most elegant solution would probably be to move the input processing and
handling as much as possible outside of wineserver (glancing at esync), but I
am no expert in that regard.

kind regards,
Riesi

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