[Bug 20106] New: [RS482] Present Windows and Desktop Grid effects in very slow

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=20106

           Summary: [RS482] Present Windows and Desktop Grid effects in very
                    slow
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: jlp.bugs at gmail.com
         QAContact: xorg-team at lists.x.org


I have an integrated ATI graphics:
01:05.0 VGA compatible controller: ATI Technologies Inc RS482 [Radeon Xpress
200M]
I'm using open source drivers from Git (commit
3ff1eb7e50fef22adb6280dd7de77c3ecafdb451)

I was reading that to help the most with development of drivers I should use
MigrationHeuristic set to always (until now I had it set to greedy) and report
bugs with this setting.

Before changing from greedy to always the desktop effects were running quite OK
in XRender mode. But after the change it became very slow. For me it is most
visible with two desktop effects I use the most often: Present Windows and
Desktop Grid.

Steps to reproduce:
1. in xorg.conf set MigrationHeuristic from greedy to always
2. in KDE 4.2 go to System Settings > Desktop > Desktop Effects
3. On General tab enable the effects and on Advanced tab set the type to
XRender
4. Apply the settings and make sure that the abowe mentioned effects are
enabled on All effects tab
5. By clicking on a wrwnch icon next to effect you can also see the keyboard
shortcat for activating the effect.
6. Open a couple of windows and activate any of these two effects

Actual result:
Windows zoom and move very slowly. When you hover the mouse over the windows
even the highlight is slow to move. Similar in the desktop grid effect.

Expected result:
Effects should be as fast as when using greedy for MigrationHeuristic


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