Messages in this thread | | | From | Valentin Schneider <> | Subject | Re: [sched/fair] b360fb5e59: stress-ng.vm-segv.ops_per_sec -13.9% regression | Date | Wed, 03 Mar 2021 18:34:13 +0000 |
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On 23/02/21 12:36, Valentin Schneider wrote: > On 23/02/21 10:30, kernel test robot wrote: >> Greeting, >> >> FYI, we noticed a -13.9% regression of stress-ng.vm-segv.ops_per_sec due to commit: >> >> >> commit: b360fb5e5954a8a440ef95bf11257e2e7ea90340 ("[PATCH v2 1/7] sched/fair: Ignore percpu threads for imbalance pulls") >> url: https://github.com/0day-ci/linux/commits/Valentin-Schneider/sched-fair-misfit-task-load-balance-tweaks/20210219-211028 >> base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git c5e6fc08feb2b88dc5dac2f3c817e1c2a4cafda4 >> >> in testcase: stress-ng >> on test machine: 96 threads Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz with 512G memory >> with following parameters: >> >> nr_threads: 10% >> disk: 1HDD >> testtime: 60s >> fs: ext4 >> class: vm >> test: vm-segv >> cpufreq_governor: performance >> ucode: 0x5003003 >>
So I've been running this on my 32 CPU arm64 desktop with: nr_threads: 10% nr_threads: 50% (20 iterations each)
In the 50% case I see a ~2% improvement, in the 10% a -0.3% regression (another batch showed -0.08%)... Still far off from the reported -14%. If it's really required I can go find an x86 box to test this on, but so far it looks like a fluke.
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