Gabriel Paubert wrote:

On Thu, Jan 28, 2010 at 05:20:55PM -0600, Joel Schopp wrote:
  

quoted

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.