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[Emmanuel Pacaud <emmanuel.pacaud@xxxxxxxxxxxxx>]

But after a while, suddenly, performances are degraded severely. It's
particularly obvious on window content scrolling (a firefox page for
example), or when playing with the nautilus selection rectangle on the
desktop (the one you get when you click on the desktop, then move the
mouse around). The mouse cursor movement is choppy.

When the system is idle, there's no anormal cpu use. When I move things,
cpu use goes up to 100%.

I've tried to get an oprofile report done when playing with the nautilus
selection rectangle. Here's the result:

CPU: Athlon, speed 1822.4 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Cycles outside of halt state) with a unit mask of 0x00 (No unit mask) count 100000
samples  %        image name               app name                 symbol name
470250   34.1294  vmlinux-2.6.32-21-generic vmlinux-2.6.32-21-generic __purge_vmap_area_lazy
441755   32.0613  vmlinux-2.6.32-21-generic vmlinux-2.6.32-21-generic native_wbinvd
29352     2.1303  libc-2.11.1.so           libc-2.11.1.so           /lib/tls/i686/cmov/libc-2.11.1.so
26870     1.9501  Xorg                     Xorg                     /usr/bin/Xorg
22234     1.6137  agpgart                  agpgart                  /agpgart
19673     1.4278  libcrypto.so.0.9.8       libcrypto.so.0.9.8       /lib/i686/cmov/libcrypto.so.0.9.8
16454     1.1942  opreport                 opreport                 /usr/bin/opreport
14938     1.0842  libglib-2.0.so.0.2400.0  libglib-2.0.so.0.2400.0  /lib/libglib-2.0.so.0.2400.0
12351     0.8964  oprofile                 oprofile                 /oprofile
11790     0.8557  vmlinux-2.6.32-21-generic vmlinux-2.6.32-21-generic flush_all_zero_pkmaps
10955     0.7951  python2.6                python2.6                /usr/bin/python2.6
9729      0.7061  libexa.so                libexa.so                /usr/lib/xorg/modules/libexa.so
9422      0.6838  libgobject-2.0.so.0.2400.0 libgobject-2.0.so.0.2400.0 /usr/lib/libgobject-2.0.so.0.2400.0

-- 
[RV280] Degraded performance after some minutes of use
https://bugs.launchpad.net/bugs/570965
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