[Bug 95474] Bioshock Infinite and DiRT Showdown perform very poorly on any GPU with GCN >=1.1

https://bugs.freedesktop.org/show_bug.cgi?id=95474

--- Comment #12 from Marek Olšák maraeo@gmail.com --- (In reply to Jan Ziak from comment #9)

Created attachment 124063 [details] kcachegrind screenshot: _mesa_FenceSync

I ran callgrind on Bioshock with mesa-git.

Callgrind instrumentation was enabled only when the Bioshock benchmark was rendering frames from the game. The benchmark graphics quality was set to Medium.

The screenshot I am sending indicates that Bioshock expects a faster _mesa_FenceSync implementation.

I wouldn't trust callgrind, because it runs on a CPU emulator.

The proper way to profile this is to build Mesa with -fno-omit-frame-pointer and use sysprof, which is very easy to use. Sysprof can also save the results to disk.