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The project was started by University student Andrew Comminos which improves Wine performance. A new Staging branch based right off 2.21 has been added which you can find at this link: https://github.com/acomminos/wine-pba
I've tried to build it from source however it aborts a few steps through the process, the error has been reported already, hopefully will be fixed soon.
You can also read more on the author's personal blog: https://comminos.com/posts/2018-02-21-wined3d-profiling.html
Huge thanks to Andrew for his work and to Phoronix for bringing this in the spotlight. :-)
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I gave this patch a spin earlier yesterday morning, Downloaded Base Wine 2.21 > Applied Staging 2.21 patches > Applied Andrew's patch. Didn't have much luck. Games ran, sound audible but with a black screen.
I recompiled it again using latest patches, black screens are gone and there are some serious improvements this time (also a regression):
As you can see above, Witcher 3 improved a lot for Nvidia, however all the characters (including Geralt's horse) are invisible. Also noticed an important factor - my GPU usage peaked to about 80%.
Will keep posting with updates :)
For the moment I can't seem to manage to build a WoW64 Wine build (32+64bit combo) so all my tests will either be a Pure 32bit or 64bit build.
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Quick summary here:
staging-2.20 avg: 83.83
staging-2.21 avg: 83.65
staging-2.21+pba patches avg: 104.77
Links to plotted fps graphs etc are in reddit post:
Link to my Reddit post
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Have you asked the wine developers and the pba guy this? It might make more sense on #winehackers or wine-devel than here to wonder about it.
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~7 fps wine master latest
~20 fps wine master latest with (new) buffer patch
~20 fps wine staging 2.21
~13 fps wine staging 2.21 with PBA patches
PBA patches gives invisible Geralt etc as already reported (using 4 from: ae1cb0d Fix constant buffer invalidation).
Not sure why the Nvidia performance improved so much for Avehicle7887 but not for me. :-/
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It was a bit shorter game tho but i did see around 100-130 fps most of the time.
staging-2.20 avg: 83.83
staging-2.21 avg: 83.65
staging-2.21+pba patches avg: 104.77
staging-2.21+pba patches (rebuild with latest) avg: 113.23
link to plot
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Someone already asked this question in this bug: https://bugs.winehq.org/show_bug.cgi?id=42592#c75