Re: iBook bogomips
On Wed, 2006-04-12 at 14:47 +0200, Saladino wrote:
> Hi,
> Looking at my cpuinfo, i found that my bogomips rate is veeery looow.
> saladino@Zack:~$ cat /proc/cpuinfo
> processor : 0
> cpu : 7447A, altivec supported
> clock : 666.666000MHz
> revision : 0.5 (pvr 8003 0105)
> bogomips : 36.73
> timebase : 18432000
> machine : PowerBook6,7
> motherboard : PowerBook6,7 MacRISC3 Power Macintosh
> detected as : 287 (iBook G4)
> pmac flags : 0000001b
> L2 cache : 512K unified
> pmac-generation : NewWorld
>
> Its a 1,33 GHz iBook with 1GB of ram and a custom kernel, are the
> numbers ok? or i am suffering a cpu problem?
Recent kernel changed the way short timing loops are implemented on
powerpc. We now use the CPU timebase instead of stupid calibrated empty
loops. Thus the bogomips value nowadays has nothing to do with the CPU
ability to run empty loops anymore :)
Ben.
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