Performance Testing Wine-1.2-rc4 vs Wine-1.8

[Stefan Dösinger]

Am 2017-01-17 um 22:55 schrieb Stefan Dösinger:
> The one game that jumps out is Trackmania Nations. It apparently
> regressed from approx. 32 fps to 24. I will run a bisect in the next
> days to pinpoint the patch that caused this. The game itself wasn't updated.
I bisected this regression on the iMac itself, and the "bad" patch is
70889d68664c1211caf5a845014953dfee66c8f4. However, the patch is working
as it is supposed to.

The game has a setting "GPU Synchro" that defaults to "Immediate". With
this setting the game uses event queries to achieve the equivalent of
glFinish(). Before 70889d68 an unsignalled event query would return S_OK
and *data was set to FALSE. Now it returns S_FALSE and *data is left
unset. This change in behavior makes the game's wait work as intended
and the performance goes down.

Setting the synchronization to 1 frame (so the game waits for a query
from one frame ago) restores the original performance.



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