[Bug 34929] [r300g] slowdown with r300g threading

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34929

--- Comment #4 from Fabio Pedretti <fabio.ped at libero.it> 2011-03-03 02:06:34 PST ---
(In reply to comment #3)
> I can't see a significant performance difference with the games you mentioned.
> openarena fps went from 93 to 91 with threading. glxgears frames went from 15k
> to 17k. Torcs fps went from 23 to 27. There is no visible difference in
> supertuxkart. I don't say it always improves performance, but it should mostly
> be a win.

Without gdb torcs is about the same but I definitively get a slowdown with
glxgears:

$ vblank_mode=0 RADEON_THREAD=0 glxgears 2>&1 | grep FPS
8445 frames in 5.0 seconds = 1688.847 FPS
8196 frames in 5.0 seconds = 1639.119 FPS
8197 frames in 5.0 seconds = 1639.396 FPS

$ vblank_mode=0 glxgears 2>&1 | grep FPS
6789 frames in 5.0 seconds = 1357.671 FPS
6878 frames in 5.0 seconds = 1375.596 FPS
6879 frames in 5.0 seconds = 1375.797 FPS

Did you try running some apps under gdb? The problem is hugely amplified with
it. Example:

$ vblank_mode=0 RADEON_THREAD=0 gdb glxgears 2>&1 | grep FPS
8171 frames in 5.0 seconds = 1634.191 FPS
8258 frames in 5.0 seconds = 1651.503 FPS
8544 frames in 5.0 seconds = 1708.673 FPS

$ vblank_mode=0 gdb glxgears 2>&1 | grep FPS
1216 frames in 5.0 seconds = 242.979 FPS
1131 frames in 5.0 seconds = 226.024 FPS
862 frames in 5.0 seconds = 172.242 FPS

It looks like opening/exiting threads has a noticeable overhead.

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