[Bug 110781] Radeon: heavy r300 performance drop regression between 11.x and 19.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110781

--- Comment #39 from Richard Thier <u9vata at gmail.com> ---
First I went on to strace a bit and measure directly...

10 sec glxgears - lastfast 17.x:

- 2105 ioctl calls
- 6 DRM_IOCTL_RADEON_GEM_CREATE
- 7 DRM_IOCTL_GEM_CLOSE

10 sec glxgears - patched 19.x:

- 2916 ioctl calls
- 712 DRM_IOCTL_RADEON_GEM_CREATE
- 713 DRM_IOCTL_GEM_CLOSE

In comparison this is the unpatched 19.x originally (10 sec):

-> 12466 (any) ioctl calls
-> 3111 DRM_IOCTL_RADEON_GEM_CREATE
-> 3112 DRM_IOCTL_GEM_CLOSE

Surely it is already an order of magnitude better now, but maybe still not as
best as it should be. As I told you, when bisecting there was a point I saw
this happening and it was hinting there are two issues - but one is much
smaller.

glxgears however runs roughly the same FPS now. Maybe things start to slow down
if I run out of CPU power as glxgears don't run out now - neither tuxracer, but
will try heavy things like mount&blade: warband... it was working well before..

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