CPU-freq and bogomips

[Ben Mueller <bmueller@uni-math.gwdg.de>]

Hi,

one year ago, there was a thread on this list (see e.g. 
http://lists.debian.org/debian-powerpc/2005/03/msg00826.html), that the 
frequency of the 7447A CPU should equal approximately the value of 
bogomips.

I wonder, if this should also be the case for other G4 processors. Because 
my /proc/cpuinfo says:
processor       : 0
cpu             : 7447/7457, altivec supported
clock           : 999MHz
revision        : 0.1 (pvr 8002 0101)
bogomips        : 664.26
machine         : PowerBook5,2
motherboard     : PowerBook5,2 MacRISC3 Power Macintosh
detected as     : 287 (PowerBook G4 15")
pmac flags      : 0000001b
L2 cache        : 512K unified
memory          : 1536MB
pmac-generation : NewWorld

or running low speed:
clock           : 612MHz
bogomips        : 406.52

Is this correct? Or is it a problem of the kernel (2.6.15) determining 
the right cpu-frequency, similar to the initial case of the 7447A.

  Ben