* Mel Gorman <[email protected]> [2018-09-10 10:41:47]: > On Fri, Sep 07, 2018 at 01:37:39PM +0100, Mel Gorman wrote: > > > Srikar's patch here: > > > > > > > > > http://lkml.kernel.org/r/[email protected] > > > > > > Also frobs this condition, but in a less radical way. Does that yield > > > similar results? > > > > I can check. I do wonder of course if the less radical approach just means > > that automatic NUMA balancing and the load balancer simply disagree about > > placement at a different time. It'll take a few days to have an answer as > > the battery of workloads to check this take ages. > > > > Tests completed over the weekend and I've found that the performance of > both patches are very similar for two machines (both 2 socket) running a > variety of workloads. Hence, I'm not worried about which patch gets picked > up. However, I would prefer my own on the grounds that the additional > complexity does not appear to get us anything. Of course, that changes if > Srikar's tests on his larger ppc64 machines show the more complex approach > is justified. >
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/[email protected]) Kernel C = Kernel B - (Avoid task migration for small numa improvement) i.e http://lore.kernel.org/lkml/[email protected] + 2 patches from Mel (Do not move imbalanced load purely) http://lore.kernel.org/lkml/[email protected] (Stop comparing tasks for NUMA placement) http://lore.kernel.org/lkml/[email protected] To me, Kernel B which is the 13 patches accepted in v4.19-rc1 + 6 patches posted for review seem to be giving better performance. The numbers are compared to previous kernel i.e for Kernel A, v4.18 is prev for kernel B, Kernel A is prev for Kernel C, B is prev 2 node x86 Haswell v4.18 or 94710cac0ef4 JVMS Prev Current %Change 4 203769 1 316734 Kernel A JVMS Prev Current %Change 4 203769 209790 2.95482 1 316734 312377 -1.3756 Kernel B JVMS Prev Current %Change 4 209790 202059 -3.68511 1 312377 326987 4.67704 Kernel C JVMS Prev Current %Change 4 202059 200681 -0.681979 1 326987 316715 -3.14141 ================================================ 4 Node / 2 Socket PowerNV / Power 8 v4.18 or 94710cac0ef4 JVMS Prev Current %Change 8 88411.9 1 222075 Kernel A JVMS Prev Current %Change 8 88411.9 88733.5 0.363752 1 222075 214607 -3.36283 Kernel B JVMS Prev Current %Change 8 88733.5 89952 1.37321 1 214607 217226 1.22037 Kernel C JVMS Prev Current %Change 8 89952 89912.9 -0.0434676 1 217226 219281 0.946019 ================================================ 2 Node / 2 Socket Power 9 / PowerNV v4.18 or 94710cac0ef4 JVMS Prev Current %Change 4 195989 1 202854 Kernel A JVMS Prev Current %Change 4 195989 193108 -1.46998 1 202854 204042 0.585643 Kernel B JVMS Prev Current %Change 4 193108 196422 1.71614 1 204042 211219 3.51741 Kernel C JVMS Prev Current %Change 4 196422 195052 -0.697478 1 211219 207854 -1.59313 ================================================ 4 Node / 4 Socket Power 7 PhyP LPAR. v4.18 or 94710cac0ef4 JVMS Prev Current %Change 8 52826.9 1 103103 Kernel A JVMS Prev Current %Change 8 52826.9 59504.4 12.6403 1 103103 102542 -0.544116 Kernel B JVMS Prev Current %Change 8 59504.4 61674.8 3.64746 1 102542 108211 5.52847 Kernel C JVMS Prev Current %Change 8 61674.8 57946.5 -6.04509 1 108211 104533 -3.39892
