[Bug 95200] IOQuake is jerky

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95200

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
The throttling is:

batch = do swap copy
on each vblank after:
  if idle(batch): report swap done

Within mesa there is also (or should be) equivalent swap throttling. So this
shouldn't be substantially different, yet it is. If you have the time and
patience, compiling the xf86-video-intel with --enable-debug=full (and the
resultant Xorg.0.log) should confirm what I've just said.

Hmm, good, there is also an
  Option "NoVSync"
could you try that? That will keep the swap buffer throttling, but disable the
synchronous update on screen (presuming it is currently). That may be causing a
huge delay and backlog.

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