[Bug 50616] New: glClear occasionally taking >60ms

[bugzilla-daemon at freedesktop.org]

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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