Casper.Dik at Sun.COM wrote:
>> Any plans in the pipeline to support the "older" AMD procs like Athlon 64 X2 
>> 4850E?
>> This feature does make a big difference in system power usage. When my 
>> system runs Solaris is cons
> umes 90 watt, and when it runs an OS (windows or linux) which does support 
> this it consumes 68 watt
> 
> Never.  The powernow driver works for single CPU, single core.
> Solaris uses the TSC for almost everything and "fixing" that and
> making the wall clock sane is difficult.

Would there be a way to support single-socket dual core systems as a 
special case?

I guess I'm not familar with whether a dual-core K8 chip changes 
frequency for all cores at the same time (the voltage certainly changes 
together).  In which case, would a single socket dual-core case be 
easier to support as a specific (but common) special case, if the two 
cores change in lockstep?  Easier, at least, than a multi-socket case 
where the different sockets will get out of sync.

Or alternatively, would a DR-type solution work (drop all except one 
core when transitioning to low-speed idle modes; then use powernow in 
single-CPU mode)?  On going back to full speed you'd re-enable the other 
core(s).

Hugh.

PS: Reply-To set to pm-discuss.

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