[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 #15 from Simon Farnsworth <simon.farnsworth at onelan.co.uk> 2011-07-05 09:56:41 PDT ---
Redoing my benchmarking with the resolution knowledge in mind:

Whatever resolution I choose, perf top shows me that 50% of my used CPU time is
spent in r600_fence_finish from the r600g DRI driver.

At 1920x1200, I see my test program using approximately 27% CPU, and I have
about 80% idle time across both cores of the Fusion APU.

These numbers are unchanged at 1024x768.

I also see about 5% of my used CPU time in radeon_fp_native_mode from the
kernel driver; again, this is resolution independent.

I'm forced to conclude that it's not CPU-side slowdown - is there any way (like
Intel's intel_gpu_top and intel_gpu_dump) to see roughly what the GPU is up to?
Or is my best bet at this point to instrument something so that I can see the
GPU command stream (where?), and use
http://developer.amd.com/gpu_assets/r600isa.pdf to decode what's going on?

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