Messages in this thread | | | Date | Wed, 12 Sep 2018 15:57:52 +0530 | From | Srikar Dronamraju <> | Subject | Re: [PATCH 4/4] sched/numa: Do not move imbalanced load purely on the basis of an idle CPU |
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> > Running SPECJbb2005. Higher bops are better. > > > > Kernel A = 4.18+ 13 sched patches part of v4.19-rc1. > > Kernel B = Kernel A + 6 patches (http://lore.kernel.org/lkml/1533276841-16341-1-git-send-email-srikar@linux.vnet.ibm.com) > > Kernel C = Kernel B - (Avoid task migration for small numa improvement) i.e > > http://lore.kernel.org/lkml/1533276841-16341-4-git-send-email-srikar@linux.vnet.ibm.com > > + 2 patches from Mel > > (Do not move imbalanced load purely) > > http://lore.kernel.org/lkml/20180907101139.20760-5-mgorman@techsingularity.net > > (Stop comparing tasks for NUMA placement) > > http://lore.kernel.org/lkml/20180907101139.20760-4-mgorman@techsingularity.net > > We absolutely need the 'best' pre-regression baseline kernel measurements as well - was it > vanilla v4.17? >
I kept the baseline as 4.18. The only revert I know since 4.16 from a numa balancing front is the one where we unintentionally skipped task migrations. It did somehow give good results to a set of benchmarks but it would completely circumvent the task migration code. I am not sure if Jirka was taking the numbers from that kernel. From what I remember, we will pulled it out before 4.16 stabilized.
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