[fc5] I seem to have misplaced a few MHz

[Andy Green]

Michael A. Peters wrote:

> Does anyone know what might be causing this?
> The CPU itself does support throttling (wanted when not connected to AC
> power) - and it seems that something is in fact causing it to throttle,

'Throttling' seems to be used in this context to refer to modulating the 
clock with PWM.  So the clock remains at whatever high speed, but is 
silenced for some period, eg, 50% throttling turns the fast clock off 
for half the time.  The PWM modulation happens at 1kHz IIRC so the net 
effect of it feels like a reduction in the clock speed.  But the point 
is while throttling is active you see your CPU clock at its high speed.

> if memory serves - 550MHz is what it throttles to when I disconnect it
> from AC - but now, I've told the bios to use maximum performance under
> all conditions and I'm not getting the full CPU speed which the kernel
> does correctly detect.
> 
> Any suggestions? This hardware is slow enough as it is ;)

service cpuspeed stop

see if that helps.

-Andy


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