[Bug 90791] Bad performance with primusrun since Mesa 10.5.5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90791

            Bug ID: 90791
           Summary: Bad performance with primusrun since Mesa 10.5.5
           Product: Mesa
           Version: 10.6
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: anakin.cs at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Since Mesa 10.5.5 I am getting a quite bad performance with primusrun on my
laptop to make use of the Nvidia card.
I've tested on CS GO and CS 1.6.

On CS GO, I used to have around 130 FPS, now I have around 80-90 FPS with drops
below 60 which cause some stutters/mouse lag.
On CS 1.6, I have around 80-90 FPS with the nvidia card and 150+ with the intel
card, so there is definitely a problem.

Here is the bug report on primus bug tracker:
https://github.com/amonakov/primus/issues/170

Setting PRIMUS_UPLOAD to 1 seem to boost the performance, but not as much as
before. Here is what the primus doc says:
"0: autodetect, 1: textures, 2: PBO/glDrawPixels (needs Mesa-10.1+)"

This *may* be related to this commit:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=716b5f7cbe9cb7611d593f170a98facef58e3d0a

I have a Intel Core i7 4702MQ CPU.

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