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

Aneesh Kumar K.V aneesh.kumar at linux.ibm.com
Wed Nov 15 16:54:59 AEDT 2023

Srikar Dronamraju <srikar at linux.vnet.ibm.com> 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?


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