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 at lists.freedesktop.org
ReportedBy: curaga at 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).
--
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.
--
Mesa 8.0.3
Linux 3.2.17
HD4350 / r600g
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