[tip:sched/core] [sched/topology] 9e005ed211: stress-ng.kill.ops_per_sec 4.6% regression
From: kernel test robot
Date: Wed Jun 10 2026 - 22:20:07 EST
Hello,
kernel test robot noticed a 4.6% regression of stress-ng.kill.ops_per_sec on:
commit: 9e005ed21152d4a4bb0ceea71045ff8a642a6feb ("sched/topology: Allow multiple domains to claim sched_domain_shared")
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git sched/core
testcase: stress-ng
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 256 threads 4 sockets INTEL(R) XEON(R) PLATINUM 8592+ (Emerald Rapids) with 256G memory
parameters:
nr_threads: 100%
testtime: 60s
test: kill
cpufreq_governor: performance
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202606111053.c484a580-lkp@xxxxxxxxx
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260611/202606111053.c484a580-lkp@xxxxxxxxx
=========================================================================================
compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-emr-2sp1/kill/stress-ng/60s
commit:
a26d9208c1 ("Merge branch 'sched/cache'")
9e005ed211 ("sched/topology: Allow multiple domains to claim sched_domain_shared")
a26d9208c1376ac3 9e005ed21152d4a4bb0ceea7104
---------------- ---------------------------
%stddev %change %stddev
\ | \
16542 -5.6% 15623 stress-ng.kill.kill_calls_per_sec
66940342 -4.6% 63830711 stress-ng.kill.ops
1116630 -4.6% 1064849 stress-ng.kill.ops_per_sec
50279 +5.7% 53164 meminfo.KernelStack
14019 ± 46% -48.8% 7174 ± 70% numa-vmstat.node2.nr_slab_reclaimable
10643 ± 21% +49.0% 15853 ± 19% numa-vmstat.node3.nr_slab_reclaimable
50278 +5.7% 53144 proc-vmstat.nr_kernel_stack
74611 +1.0% 75344 proc-vmstat.nr_vmalloc
613641 +5.5% 647439 ± 3% proc-vmstat.pgfree
56078 ± 46% -48.8% 28697 ± 70% numa-meminfo.node2.KReclaimable
56078 ± 46% -48.8% 28697 ± 70% numa-meminfo.node2.SReclaimable
42574 ± 21% +49.1% 63467 ± 19% numa-meminfo.node3.KReclaimable
42574 ± 21% +49.1% 63467 ± 19% numa-meminfo.node3.SReclaimable
0.03 ± 55% -64.7% 0.01 ± 99% sched_debug.cfs_rq:/.spread.avg
0.26 ± 27% -55.0% 0.12 ± 84% sched_debug.cfs_rq:/.spread.stddev
4715 ± 14% -28.3% 3380 ± 44% sched_debug.cpu.curr->pid.min
0.32 ± 3% -8.3% 0.30 ± 3% sched_debug.cpu.nr_running.stddev
22.17 ± 31% +128.9% 50.75 ± 12% sched_debug.cpu.nr_uninterruptible.max
3.99 ± 14% +55.6% 6.20 ± 4% sched_debug.cpu.nr_uninterruptible.stddev
Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki