Messages in this thread | | | Date | Fri, 29 Jan 2010 10:26:15 -0600 | From | Joel Schopp <> | Subject | Re: [PATCHv3 2/2] powerpc: implement arch_scale_smt_power for Power7 |
| |
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.
| |