Re: [PATCH 0/5] x86,smp: make ticket spinlock proportional backoffw/ auto tuning

[Rafael Aquini]

On Wed, Jan 09, 2013 at 06:20:35PM +0530, Raghavendra K T wrote:
> I ran kernbench on 32 core (mx3850) machine with 3.8-rc2 base.
> x base_3.8rc2
> + rik_backoff
>     N           Min           Max        Median           Avg        Stddev
> x   8       222.977        231.16       227.735       227.388     3.1512986
> +   8        218.75       232.347      229.1035     228.25425     4.2730225
> No difference proven at 95.0% confidence

I got similar results on smaller systems (1 socket, dual-cores and quad-cores)
when running Rik's latest series, no big difference for good nor for worse,
but I also think Rik's work is meant to address bigger systems with more cores
contending for any given spinlock.


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