[Bug 51787] performance regression with llvm shader compiler in ut2004

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=51787

--- Comment #3 from Andy Furniss <lists at andyfurniss.entadsl.com> 2012-08-02 22:32:43 UTC ---
(In reply to comment #2)
> It might not help in fixing this, but I found that the framerate is much more
> consistent if I load all cpu cores with something while playing ut2004.
> Normally, the framerate counter is green, but flashes into yellow and purple,
> which makes movements very choppy. When something is running in the background,
> the framerate counter stays green, and all movements are smooth.

Maybe cpufreq is causing this here's what I get on the demo on an HD4890 +
4x3.4GHz phenom II.

R600_LLVM=0 ut2004
as-convoy?spectatoronly=1?numbots=8?quickstart=1?attractcam=1 -benchmark
-seconds=120 -nosound

cpufreq ondemand - 

30.027578 / 76.497787 / 162.457611 fps

cpufreq set to performance

37.627441 / 93.523949 / 197.051376 fps

> 
> With the llvm compiler the game is unplayable either way.

I see the stalling in the demo benchmark.

2.030273 / 70.589706 / 196.047073 fps

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