Re: [PATCH v4 0/5] powerpc/smp: Topology and shared processor optimizations

[Aneesh Kumar K.V]

Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx> writes:

> PowerVM systems configured in shared processors mode have some unique
> challenges. Some device-tree properties will be missing on a shared
> processor. Hence some sched domains may not make sense for shared processor
> systems.
>
> Most shared processor systems are over-provisioned. Underlying PowerVM
> Hypervisor would schedule at a Big Core granularity. The most recent power
> processors support two almost independent cores. In a lightly loaded
> condition, it helps the overall system performance if we pack to lesser
> number of Big Cores.
>

Is this good to do if the systems are not over-provisioned? What will be
the performance impact in that case with and without the change?

-aneesh