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

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Jul 4 09:30:57 PDT 2011


--- Comment #11 from Michel Dänzer <michel at daenzer.net> 2011-07-04 09:30:56 PDT ---
Note that as you say it's not hitting even 10% CPU load, it's probably not a
simple CPU bottleneck but some kind of timing / timeout issue. The tracepoint
events listed by

 perf list|grep -e drm -e radeon

might be useful, but I haven't played with those myself, so I can't give
specific instructions.

Or, just attach gdb to the app and/or X server, interrupt them every now and
them and see if they're in a particular place most of the time. That might at
least give an idea where to continue digging.

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