* Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com> [2023-11-15 11:24:59]:
> Srikar Dronamraju <sri...@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? > We are consolidating 1 thread per thread group (aka SMT domain). Since each thread-group is suppose to be independent including having a private L1/L2/L3 cache, we expect minimal impact in non over provisioned scenario. In Over utilization scenario, the changes in this patchset will not even kick in. -- Thanks and Regards Srikar Dronamraju
