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

From: Joel Schopp
Date: Fri Jan 29 2010 - 11:26:32 EST

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? ;-)

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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