Per core frequency control

[Svein Skogen (Listmail account)]

On 09.11.2010 11:56, David Naylor wrote:
> Hi,
> 
> I was reading through cpufreq(4) and in the bugs section it mentions that per 
> core (or CPU) frequency control is not supported.  That all cores/CPUs have to 
> be at the same speed.  
> 
> What is the reason for that?  
> 
> Is it an infrastructure problem with FreeBSD or has it just not been 
> implemented?  
> 
> And how will the recent work on event timers (and a "tickless" kernel) impact 
> on this problem? 

You did read the "symmetric" part of "symmetric multi processor" didn't you?

It's a limitation of the technology. One clock.

//Svein

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