[Bug 80792] [IVB/HSW/BYT-M Bisected]3D ( SynMark2_v5.3.0 /SynMark2_v6.0 /Lightsmarkv2008 &/warsow_v1.0 /GLBenchmarkv2.7.0) performance reduced 20%~70%

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80792

Iago Toral <itoral at igalia.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |chrisf at ijw.co.nz,
                   |                            |kenneth at whitecape.org

--- Comment #1 from Iago Toral <itoral at igalia.com> ---
Besides this, there are other problems with this patch as well. We are
currently looking into it.

Kenneth sent a couple of patches that modify mine to disable SOL statistics
when doing meta operations and also to change certain configurations when
transform feedback was inactive:

http://lists.freedesktop.org/archives/mesa-dev/2014-July/062571.html
http://lists.freedesktop.org/archives/mesa-dev/2014-July/062572.html

I wonder if these fix the performance drop you detected. I'll attach these
patches here so you can test again (the second one needs to be modified to
prevent a GPU hang, so I'll attach the updated version)

If that does not fix the problem then it would look like activating the SOL
unit even when disabling output to all buffers may have too big of a
performance impact, which I think Chris was not expecting. In that case maybe
we have to rethink the approach to GL_PRIMITIVES_GENERATED.

Adding Kenneth and Chris to the CC just in case they have something to add.

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