Re: [PATCH] x86,sched: Fix sched_smt_power_savings totally broken

[Peter Zijlstra]

On Tue, 2012-01-10 at 06:32 -0800, Arjan van de Ven wrote:
> 
> a very good default would be to keep all tasks on one package until half
> the cores in the package are busy, and then start spreading out. 

Does that still make sense when there's strong NUMA preference? By
forcing stuff on a single package you increase the number of remote
memory fetches (which generally generate more stalls), also the memory
controllers need to stay awake anyway.


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