Re: [PATCHv3 2/2] powerpc: implement arch_scale_smt_power for Power7

[Joel Schopp]

Gabriel Paubert wrote:
> On Thu, Jan 28, 2010 at 05:20:55PM -0600, Joel Schopp wrote:
>   
> > On Power7 processors running in SMT4 mode with 2, 3, or 4 idle threads 
> > there is performance benefit to idling the higher numbered threads in
> > the core.  
> >
> >     
>
> Really 2, 3, or 4? When you have 4 idle threads out of 4, performance
> becomes a minor concern, no? ;-)
>
> 	Gabriel
>   
Yes, but going from 4 idle to 3 idle you want to keep the slanted 
weights.  If you ignored 4 you'd place wrong and then correct it after 
the fact.
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