Re: Wrong bogomips after plugging in AC power

[Pavel Machek]

Hi!

> > > If I plug it into AC power, it will speed up to 300MHz, but bogomips
> > > still have "slow" value. Therefore all udelays are wrong by factor of
> > > two -- udelay(50) will only wait approx. 25usec. That seems pretty
> > > dangerous to me. Maybe we need some other source of short loops?
> > 
> > I suspect I'll see a similar problem on the PowerPC.  The PPC has a way of
> > throttling the rate instructions are delivered from the icache to the execution
> 
> You may want to call the bogomips calibration on the x86 when you get power
> notifications. What you do on the PPC I dont know. I assume such throttling

But: that would make correctness of kernel dependend on
CONFIG_APM. That does not seem right. Also, bogomips recalibration is
quite slow.
                                                                Pavel
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