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X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, kernel test robot noticed a 13.5% regression of stress-ng.timerfd.ops_per_sec on: commit: ed30c4adfc2b56909ca43fb5e4750a646928cbf4 ("slab: add optimized sheaf refill from partial list") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [still regression on linus/master a95f71ad3e2e224277508e006580c333d0a5fe36] [still regression on linux-next/master d4906ae14a5f136ceb671bb14cedbf13fa560da6] testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 224 threads 2 sockets Intel(R) Xeon(R) Platinum 8480CTDX (Sapphire Rapids) with 512G memory parameters: nr_threads: 100% testtime: 60s test: timerfd 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 | Closes: https://lore.kernel.org/oe-lkp/202602241519.7f9aea41-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260224/202602241519.7f9aea41-lkp@intel.com ========================================================================================= 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-spr-2sp4/timerfd/stress-ng/60s commit: 913ffd3a1b ("slab: handle kmalloc sheaves bootstrap") ed30c4adfc ("slab: add optimized sheaf refill from partial list") 913ffd3a1bf5d154 ed30c4adfc2b56909ca43fb5e47 ---------------- --------------------------- %stddev %change %stddev \ | \ 17379 +2.9% 17891 stress-ng.time.percent_of_cpu_this_job_got 7100 +28.7% 9137 stress-ng.time.system_time 3397 -51.2% 1657 ± 3% stress-ng.time.user_time 2.162e+10 -13.5% 1.87e+10 stress-ng.timerfd.ops 3.596e+08 -13.5% 3.111e+08 stress-ng.timerfd.ops_per_sec 24.13 -50.5% 11.96 ± 2% vmstat.cpu.us 20.84 -2.2 18.66 mpstat.cpu.all.irq% 51.25 +14.5 65.79 mpstat.cpu.all.sys% 24.90 -12.6 12.34 ± 2% mpstat.cpu.all.usr% 0.92 -12.4% 0.81 turbostat.IPC 114.75 -13.2 101.54 turbostat.PKG_% 21.44 +5.0% 22.52 ± 3% turbostat.RAMWatt 0.02 ± 20% +187.5% 0.06 ± 35% perf-stat.i.MPKI 1.146e+11 -12.7% 1.001e+11 perf-stat.i.branch-instructions 0.17 ± 7% +0.0 0.21 ± 5% perf-stat.i.branch-miss-rate% 1.397e+08 ± 4% +16.8% 1.632e+08 ± 2% perf-stat.i.branch-misses 12.23 ± 47% -10.3 1.92 ± 40% perf-stat.i.cache-miss-rate% 2332655 ± 45% +742.7% 19656432 ± 53% perf-stat.i.cache-misses 16606819 ± 9% +8113.0% 1.364e+09 ± 8% perf-stat.i.cache-references 1.11 +14.1% 1.27 perf-stat.i.cpi 730605 ± 33% -91.1% 65146 ± 48% perf-stat.i.cycles-between-cache-misses 5.892e+11 -12.4% 5.162e+11 perf-stat.i.instructions 0.91 -12.3% 0.80 perf-stat.i.ipc 0.00 ± 46% +868.2% 0.04 ± 54% perf-stat.overall.MPKI 0.12 ± 4% +0.0 0.16 ± 3% perf-stat.overall.branch-miss-rate% 13.80 ± 38% -12.3 1.45 ± 53% perf-stat.overall.cache-miss-rate% 1.09 +14.0% 1.24 perf-stat.overall.cpi 310396 ± 24% -87.4% 39114 ± 34% perf-stat.overall.cycles-between-cache-misses 0.92 -12.2% 0.81 perf-stat.overall.ipc 1.128e+11 -12.7% 9.852e+10 perf-stat.ps.branch-instructions 1.371e+08 ± 4% +16.8% 1.602e+08 ± 2% perf-stat.ps.branch-misses 2278016 ± 45% +747.6% 19307920 ± 54% perf-stat.ps.cache-misses 16326694 ± 9% +8118.6% 1.342e+09 ± 8% perf-stat.ps.cache-references 5.796e+11 -12.4% 5.078e+11 perf-stat.ps.instructions 3.566e+13 -12.2% 3.129e+13 perf-stat.total.instructions 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