[Bug 38800] glXSwapBuffersMscOML is slow on AMD Fusion but not on Intel 945 w/Atom

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=38800

--- Comment #9 from Simon Farnsworth <simon.farnsworth at onelan.co.uk> 2011-07-04 06:27:19 PDT ---
Updating to git master (on top of airlied's drm-fixes) has improved things, but
I'm still not there. I have gone to the following commits in each interesting
tree:

dri2proto: commit 7fd18b15646a62bd82a4eb0eca60a34c1731813d
drm: commit 6dd804c5a92104042b8be0a67d107946394a0b7a
glproto: commit 6d7e398150dde1c15b7f62f485cb33bad8f4d5c6
libpciaccess: commit f9159b97834ba4b4e42a07953a33866e7ac90dbd
mesa: commit 424b1210d951c206e7c2fb8f2778acbd384eb247
pixman: commit eff7c8efabe2da33edbf0bdc06e101352981286b
randrproto: commit b5c977ad70b845c278ef52c004d9e5fc3ec97cbf
xf86-video-ati: commit 9bb31158466e6168116d841d12c8b4303f11c4a6
xorg-font-util: commit 9f807dfb4e7bea7128b7538e41de78bb5994ca80
xorg-macros: commit 08dd5d30c137abe43d5b1673edc39eb569881d66
xproto: commit 06ebd5b88bee8c54222bde3178dc773776036802
xserver: commit 73c05be80a1d682ff623e66f47e87403d94caef5

Both test programs still get the same results, but now they look like:

# ~/swapbuffersnowaittest 
Screen is 1920x1200
Averaging 2.000000 frames per swap
Average swap interval 33.317115 ms
122 frames, 61 swaps

# ~/swapbufferstest 
Screen is 1920x1200
Averaging 1.936508 frames per swap
Average swap interval 32.274285 ms
122 frames, 63 swaps

xrandr shows:

# xrandr 
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192
LVDS connected (normal left inverted right x axis y axis)
   1024x768       60.0 +
   800x600        59.9  
   848x480        59.7  
   720x480        59.7  
   640x480        59.4  
HDMI-0 disconnected (normal left inverted right x axis y axis)
VGA-0 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 519mm
x 324mm
   1920x1200      60.0*+
   1600x1200      60.0  
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1

Note that the LVDS is a fake - there isn't anything actually connected there.

What's the best way for me to proceed from here? Is there a perf invocation
that would help me find bottlenecks, for example?

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