[Bug 81551] [dri3] Mesa does not support explicit fencing

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81551

--- Comment #19 from Chris Wilson <chris at chris-wilson.co.uk> ---
fwiw the overhead from implicit fencing is ~40% (on byt, bdw-u) in CPU-bound
rendering workloads (as the implicit fencing prevents the driver from batching
up rendering commands).

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