opreport reports 0 Mhz processor speed

[Tomas Kral <thomas.kral@email.cz>]

Hello List,

I would like to learn to use a profiler.
It seems Squeeze kernel supports it.
I have installed oprofile package.

But it reports 0 Mhz processor speed.
Why?

$ opreport --global-percent | head -22
Overflow stats not available
CPU: CPU with timer interrupt, speed 0 MHz (estimated)
Profiling through timer interrupt
          TIMER:0|
  samples|      %|
------------------
    20752 40.1773 libmpeg2.so.0.0.0
     9527 18.4449 no-vmlinux
     2805  5.4307 libpixman-1.so.0.16.4
     2365  4.5788 libglib-2.0.so.0.2800.6
     1892  3.6630 libgobject-2.0.so.0.2800.6
     1849  3.5798 libc-2.11.2.so
     1468  2.8422 Xorg
              TIMER:0|
      samples|      %|
    ------------------
         1452  2.8112 Xorg
           16  0.0310 [vdso] (tgid:2090 range:0xb7746000-0xb7747000)
     1391  2.6931 libgstreamer-0.10.so.0.26.0
     1289  2.4956 libpthread-2.11.2.so
     1178  2.2807 libxaa.so
      797  1.5430 libcairo.so.2.10800.10
      702  1.3591 liba52-0.7.4.so

Many thanks

-- 
Tomas Kral <thomas.kral@email.cz>