https://bugs.freedesktop.org/show_bug.cgi?id=50616
Bug #: 50616 Summary: glClear occasionally taking >60ms Classification: Unclassified Product: Mesa Version: 8.0 Platform: x86-64 (AMD64) OS/Version: Linux (All) Status: NEW Severity: minor Priority: medium Component: Drivers/Gallium/r600 AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: curaga@operamail.com
I have a test app that draws 65k point sprites, apitrace: http://kiwi6.com/file/0c0512r1no (980kb).
Apitrace says that on average glClear takes 28ms, and many clear calls take over 60ms. Surely it shouldn't take that long?
If it were because of tearing prevention, it should take at most 16ms (1/60Hz).
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vblank_mode=0 had no change, oprofile says Mesa takes less than 2% cpu. Latencytop shows radeon_fence_wait taking between 3 and 5ms during rendering.
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Mesa 8.0.3 Linux 3.2.17 HD4350 / r600g