* Shrikanth Hegde <sshe...@linux.vnet.ibm.com> [2023-10-19 21:26:56]:
> > > On 10/18/23 10:07 PM, Srikar Dronamraju wrote: > > If there are shared processor LPARs, underlying Hypervisor can have more > > virtual cores to handle than actual physical cores. > > > > Starting with Power 9, a core has 2 nearly independent thread groups. > > On a shared processors LPARs, it helps to pack threads to lesser number > > of cores so that the overall system performance and utilization > > improves. PowerVM schedules at a core level. Hence packing to fewer > > cores helps. > > > > For example: Lets says there are two 8-core Shared LPARs that are > > actually sharing a 8 Core shared physical pool, each running 8 threads > > each. Then Consolidating 8 threads to 4 cores on each LPAR would help > > them to perform better. This is because each of the LPAR will get > > 100% time to run applications and there will no switching required by > > the Hypervisor. > > > > To achieve this, enable SD_ASYM_PACKING flag at CACHE, MC and DIE level. > > This would have a conflict with tip/master. > DIE has been renamed to PKG and Both changelog and code below should > change DIE to PKG. Once the changes are part of powerpc/merge, will rebase and accomodate the changes from DIE to PKG. -- Thanks and Regards Srikar Dronamraju
