[Bug 17129] Slow to move translucent windows above a certain size with EXA (r300)

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=17129





--- Comment #7 from Joel Feiner <jafeiner at gmail.com>  2008-08-25 16:16:34 PST ---
I found an interesting phenonemon today.  If I alt-drag the translucent window
if it's underneath another window, say, Konsole, then the slowness disappears
(and almost no CPU time is used).  Bring it back above Konsole and the movement
is slow and laggy again.  But moving it around near the side of the screen,
where maybe 2/3 to 3/4's of the translucent window is off the edge of the
screen (or less) causes the lagginess to subside.

Opreport looks like this while laggy:
samples  %        image name               app name                 symbol name
27593    23.7846  radeon                   Xorg                     /radeon
17364    14.9674  vmlinux                  Xorg                    
vt8237_force_enable_hpet
5660      4.8788  Xorg                     Xorg                    
dixLookupPrivate
5567      4.7986  vmlinux                  Xorg                     vsscanf
4566      3.9358  libc-2.8.so              Xorg                    
/lib/libc-2.8.so
1935      1.6679  vmlinux                  Xorg                     sys_vm86old
1550      1.3361  libpixman-1.so.0.11.9    Xorg                     pixman_op
1083      0.9335  libqt-mt.so.3.3.8        kicker                  
/usr/qt/3/lib/libqt-mt.so.3.3.8
1053      0.9077  Xorg                     Xorg                    
miComputeClips

When moving it under the other window:
samples  %        image name               app name                 symbol name
4213      8.1681  Xorg                     Xorg                    
dixLookupPrivate
3099      6.0083  libc-2.8.so              Xorg                    
/lib/libc-2.8.so
1361      2.6387  radeon                   Xorg                     /radeon
1269      2.4603  vmlinux                  Xorg                     sys_vm86old
934       1.8108  libpixman-1.so.0.11.9    Xorg                     pixman_op
876       1.6984  libqt-mt.so.3.3.8        kicker                  
/usr/qt/3/lib/libqt-mt.so.3.3.8
841       1.6305  vmlinux                  vmlinux                 
acpi_processor_get_throttling_info
750       1.4541  vmlinux                  Xorg                    
vt8237_force_enable_hpet
721       1.3979  Xorg                     Xorg                    
miComputeClips
683       1.3242  vmlinux                  vmlinux                 
uvesafb_vbe_state_save
642       1.2447  Xorg                     Xorg                    
miValidateTree


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