[Bug 94596] xserver-1.18.2 uses one core fully with dri3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94596

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
Spinning on poll. Ok, next up is perf report -G --stdio | head -500

My bet is the busywait in ms_present_queue_vblank() when its gets more than 128
vblanks behind the clients.

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