[Bug 24558] Starcraft II - CPU freq. not running at max performance

wine-bugs at winehq.org wine-bugs at winehq.org
Sun Nov 7 06:20:26 CST 2010


--- Comment #8 from Ema <ema.oriani at gmail.com> 2010-11-07 06:20:24 CST ---
Added a couple of screenshots proving my point.
Settings all Ultra on a GeForce 470 GTX (used virtual desktop to show CPU
frequency, situation is the same in full screen, Full HD).

As you can see, the same scene goes from 14 -> 21 FPS, basically 50% more.
Compiz enabled/disabled doesn't make any difference, it is really something
related to process 'sleep'... my fear is that this bug will be hard to trace
unless someone manages to stack-trace when the SC2 process is being put to
Once we find this cause, then it should be easier to remove the cause.

In my opinion might be a component that is asked to sleep for 'n' nanoseconds
but it 'oversleeps', and this is being done for each frame, so the CPU gets
auto tuned to 800 mhz, because apparently the process is being put to 'sleep'
for some strange reason (or it is a forced sleep because we would produce too
many FPS - Blizzard has issues when they were melting videocards - or it is
sleep because waiting for I/O which we should not wait for).

This is not a show stopper, and the game is playable with Low shaders 35+ FPS,
but finding this cause may fix performance a lot, not only for this game.
Again, finding the bottleneck should be the hardest part. 

Let me know what you think,

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