[Nouveau] [Bug 96355] Performance: extra&costly SSBO validation even when SSBO aren't used

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96355

--- Comment #8 from Gediminas Jakutis <gediminas at varciai.lt> ---
I don't know about the reporter's case, but I have ran some benchmarks and
tests with f018456901ee291181ecce74c30b19c9f6731f06 (latest revision before
those four patches) and fd6bbc2ee205ed02f66a8d8ef5b2adf4005d588c (the latest
revision, with the four patches) on my GTX 770 + FX-8320 @ 4.1GHz, focusing on
CPU-bound cases.

The results are all to the better - on most games I tested I see 4-10%
performance boost. Am only going to list a pair of highlights:

· Age of Wonders III, my own severely CPU limited testcase: 21 fps -> 26 fps, a
jump by a whooping 23.8% (still CPU-bound, though).
· Payday 2, well, this game has no [reproducable] way to benchmark it, but the
gameplay used to be nightmare filled with severe rubber-banding, running just
some 18-22 fps in many situations, all while painfully CPU-bound. Now, most of
rubber-banding is either gone or is a lot less noticeable. The framerate in
these aforementioned situations went up to 25-60; dipping below 30 very rarely,
while mostly maintaining over 2x performance boost. Basically, these four
patches made the game *playable* on nouveau. (The game is still very painfully
CPU-bound, though.)

So, at least here, I can see clear performance benefits.
Will leave to be marked as RESOLVED by the reporter; don't want to hijack his
issue.

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