[Bug 87821] [BYT Bisected] OglBatch1 performance regression ~20%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87821

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
On byt N2820, 1080p:

dri2: FPS: 99.9493 (MIN: 89.2223, MAX: 123.483, CV: 7.00455%, S: 10)
dri3: FPS: 58.1767 (MIN: 42.9242, MAX: 66.0809, CV: 8.41218%, S: 10)

I am not sure if dri3 is being locked to screen refresh or not (max of 66fps
suggests otherwise, but it is suspiciously close to refresh).

Tweaking DRI2 to use async flipping
[http://cgit.freedesktop.org/~ickle/xserver/commit/?h=async-20141230&id=13372bcf995599b4fe1f427923635d02d2f4c71f]:

FPS: 138.5 (MIN: 67.0551, MAX: 185.931, CV: 19.661%, S: 10)

which does support that it is the swap ellision that may be the difference, but
fwiw I cannot reproduce the reported DRI3 improvements.

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