Re: [PATCH 0/4] sched/fair: SMT-aware asymmetric CPU capacity

[Shrikanth Hegde]

> > How is the performance measured here? Which benchmark?
>
> I've used an internal NVIDIA suite (based on NVBLAS), I also tried Linpack
> and got similar results. I'm planning to repeat the tests using public
> benchmarks and share the results as soon as I can.
>
> > By any chance you are running number_running_task <= (nr_cpus / smt_threads_per_core),
> > so it is all fitting nicely?
>
> That's the case that gives me the optimal results.
>
> > If you increase those numbers, how does the performance numbers compare?
>
> I tried different number of tasks. The more I approach system saturation
> the smaller the benefits are. When I completely saturate the system I don't
> see any benefit with this changes, neither regressions, but I guess that's
> expected.


Ok. That's good.

I gave hackbench on powerpc with SMT=4, i didn't observe any regressions or improvements.
Only PATCH 4/4 applies in this case as there is no asym_cpu_capacity