[Bug 11674] Dual-core not being correctly supported in World of Warcraft (WOW)

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=11674


Norbert Lataille <nonal at freesurf.fr> changed:

           What    |Removed                     |Added
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                 CC|                            |nonal at freesurf.fr




--- Comment #20 from Norbert Lataille <nonal at freesurf.fr>  2009-05-27 05:05:40 ---
Hi,

As mentioned by may people here, WoW starts multiple threads but most of them
are not doing a lot (offloading network, sound, some struct updates). When
using GL engine, you have mainly one thread - CPU limited - and multiple others
idle threads doing sideband things. 

That's a game design limitation (I have not checked DX engine to see if it does
graphics work with more threads - will do). But basically wine is not guilty
here.

However, following some oprofiles and RDTSC traces, I tested some things in
wine code to help FPS performance.

a/ Local optimizations in wine libs: timezone code cleaning (17 million cycles
per tz conversion !), Event/Semaphore speed improvement (done through SHM),
etc...
   => This brings some FPS to the game, but is not the main limiting factor

b/ Threading in opengl.dll.so
   Using NV drivers, I can see these are not threaded on Linux. 
   Basically some runs show : 65% in the game, 35% in libGL.so

   What I have done is to thread opengl.dll.so driver, ie still using
   one gl context, but the thread calling libGL is no longer the game one
   (basically this is serializing non-sync GL calls).

   Preliminary tests have shown a quite interesting FPS improvement 
   (remember seeing x3 once in raid 25 conditions), but all of this is 
   quite experimental, and is not ready for general use.

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