[Bug 25376] New: [radeon] High CPU consumption rendering GTK+ apps

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=25376

           Summary: [radeon] High CPU consumption rendering GTK+ apps
           Product: xorg
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: dottedmag at dottedmag.net
         QAContact: xorg-team at lists.x.org


GTK+ apps render quite slowly in my setup (it may take up to 5 seconds to draw
1920x1200 Transmission window). X server nearly always consumes 100% of CPU
(thanks $deity, only one core).

Oprofile suggests the time is spent in pixman:

  samples|      %|
------------------
   239796 77.5906 libpixman-1.so.0.14.0
    27629  8.9399 no-vmlinux
     5421  1.7541 libc-2.10.1.so
     4136  1.3383 libcairo.so.2.10800.8

In pixman_rasterize_edges, in particular:

samples  %        symbol name
-------------------------------------------------------------------------------
232546   96.9798  pixman_rasterize_edges

Environment:
* 01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon HD
3400 Series
* X.Org X Server 1.6.5
* Linux vertex 2.6.32-5-generic-pae #6-Ubuntu SMP Mon Nov 23 13:10:32 UTC 2009
i686 GNU/Linux (actually rc-something)
*  (II) Module radeon: vendor="X.Org Foundation"
        compiled for 1.6.5, module version = 6.12.99
        Module class: X.Org Video Driver
        ABI class: X.Org Video Driver, version 5.0
* Mesa 7.7.0~git20091129
* libdrm-radeon 2.4.15+git20091125.6f66de98
* libdrm 2.4.15+git20091125.6f66de98
* Xmonad 0.9, no compositing in use
* libpixman 0.14.0

X.org log and dmesg are attached.


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