Greeting, FYI, we noticed a -4.5% regression of unixbench.score due to commit: commit: 6b94780e45c17b83e3e75f8aaca5a328db583c74 ("sched/core: Use load_avg for selecting idlest group") https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master in testcase: unixbench on test machine: 24 threads Nehalem-EP with 24G memory with following parameters: runtime: 300s nr_task: 100% test: shell1 cpufreq_governor: performance test-description: UnixBench is the original BYTE UNIX benchmark suite aims to test performance of Unix-like system. test-url: https://github.com/kdlucas/byte-unixbench In addition to that, the commit also has significant impact on the following tests: +------------------+-----------------------------------------------------------------------+ | testcase: change | unixbench: unixbench.score -2.9% regression | | test machine | 8 threads Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz with 6G memory | | test parameters | nr_task=1 | | | runtime=300s | | | test=shell8 | +------------------+-----------------------------------------------------------------------+ Details are as below: --------------------------------------------------------------------------------------------------> To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml testcase/path_params/tbox_group/run: unixbench/300s-100%-shell1-performance/lkp-wsm-ep1 f519a3f1c6b7a990 6b94780e45c17b83e3e75f8aac ---------------- -------------------------- 25565 -5% 24414 unixbench.score 29557557 28781098 unixbench.time.voluntary_context_switches 5743 -4% 5514 unixbench.time.user_time 9.232e+08 -4% 8.831e+08 unixbench.time.minor_page_faults 1807 -5% 1709 unixbench.time.percent_of_cpu_this_job_got 5656 -7% 5271 unixbench.time.system_time 13223805 -20% 10628072 unixbench.time.involuntary_context_switches 741766 -62% 279054 interrupts.CAL:Function_call_interrupts 31060 -9% 28214 vmstat.system.in 126250 -12% 110890 vmstat.system.cs 78.58 -6% 74.20 turbostat.%Busy 2507 -6% 2366 turbostat.Avg_MHz 9134 ± 47% -6e+03 2973 ± 36% latency_stats.max.pipe_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath 380879 ± 10% 5e+05 887692 ± 49% latency_stats.sum.wait_on_page_bit_killable.__lock_page_or_retry.filemap_fault.__do_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault 31710 ± 15% -2e+04 10583 ± 14% latency_stats.sum.call_rwsem_down_write_failed.__vma_adjust.__split_vma.do_munmap.vm_munmap.elf_map.load_elf_binary.search_binary_handler.do_execveat_common.SyS_execve.do_syscall_64.return_from_SYSCALL_64 51796 ± 4% -4e+04 15457 ± 10% latency_stats.sum.call_rwsem_down_write_failed.unlink_file_vma.free_pgtables.unmap_region.do_munmap.vm_munmap.elf_map.load_elf_binary.search_binary_handler.do_execveat_common.SyS_execve.do_syscall_64 111998 ± 18% -7e+04 37074 ± 14% latency_stats.sum.call_rwsem_down_write_failed.__vma_adjust.__split_vma.do_munmap.mmap_region.do_mmap.vm_mmap_pgoff.SyS_mmap_pgoff.SyS_mmap.entry_SYSCALL_64_fastpath 275087 ± 15% -2e+05 81973 ± 3% latency_stats.sum.call_rwsem_down_write_failed.unlink_file_vma.free_pgtables.unmap_region.do_munmap.mmap_region.do_mmap.vm_mmap_pgoff.SyS_mmap_pgoff.SyS_mmap.entry_SYSCALL_64_fastpath 930993 ± 12% -6e+05 320520 ± 4% latency_stats.sum.call_rwsem_down_write_failed.vma_link.mmap_region.do_mmap.vm_mmap_pgoff.vm_mmap.elf_map.load_elf_binary.search_binary_handler.do_execveat_common.SyS_execve.do_syscall_64 4755783 ± 9% -3e+06 1619348 ± 4% latency_stats.sum.call_rwsem_down_write_failed.__vma_adjust.__split_vma.split_vma.mprotect_fixup.do_mprotect_pkey.SyS_mprotect.entry_SYSCALL_64_fastpath 5536067 ± 10% -4e+06 1929338 ± 3% latency_stats.sum.call_rwsem_down_write_failed.copy_process._do_fork.SyS_clone.do_syscall_64.return_from_SYSCALL_64 9.032e+08 -4% 8.64e+08 perf-stat.page-faults 9.032e+08 -4% 8.64e+08 perf-stat.minor-faults 2.329e+09 2.269e+09 perf-stat.node-load-misses 2.2e+09 -9% 2.011e+09 ± 5% perf-stat.dTLB-store-misses 3.278e+10 -9% 2.987e+10 ± 6% perf-stat.dTLB-load-misses 19484819 13% 21974129 perf-stat.cpu-migrations 3.755e+13 -6% 3.54e+13 perf-stat.cpu-cycles 3244 4% 3379 perf-stat.instructions-per-iTLB-miss 4.536e+12 -4% 4.332e+12 perf-stat.branch-instructions 2.303e+13 -4% 2.208e+13 perf-stat.instructions 5.768e+12 -4% 5.517e+12 perf-stat.dTLB-loads 3.567e+11 -4% 3.414e+11 perf-stat.cache-references 2.97 2.93 perf-stat.branch-miss-rate% 2.768e+10 2.699e+10 perf-stat.node-stores 5.446e+10 -3% 5.275e+10 perf-stat.cache-misses 0.03 -4% 0.03 perf-stat.iTLB-load-miss-rate% 9.673e+09 -4% 9.294e+09 perf-stat.node-loads 3.596e+12 -4% 3.442e+12 perf-stat.dTLB-stores 0.61 0.62 perf-stat.ipc 1.347e+11 -6% 1.27e+11 perf-stat.branch-misses 7.098e+09 -8% 6.533e+09 perf-stat.iTLB-load-misses 2.309e+13 -4% 2.206e+13 perf-stat.iTLB-loads 79911173 -12% 70187035 perf-stat.context-switches turbostat._Busy 90 ++-------------------------------------*---*---------------------------+ | .. *...*.. | 80 *+..*..*...*..*...*..*...*..*...O...* O O O O O...O..O...O O O 70 O+ O O O O O O O O | | | 60 ++ | 50 ++ | | | 40 ++ | 30 ++ | | | 20 ++ | 10 ++ | | | 0 ++----------------------------------O----------------------------------+ unixbench.time.percent_of_cpu_this_job_got 2500 ++-------------------------------------------------------------------+ | | | .*... | 2000 ++ .*. *..*... | *..*...*..*...*..*...*..*...*..O...*. O O O O O..O...O..O O O O O O O O O O O O | 1500 ++ | | | 1000 ++ | | | | | 500 ++ | | | | | 0 ++---------------------------------O---------------------------------+ vmstat.system.in 40000 ++------------------------------------------------------------------+ | .*...*.. | 35000 ++ .*...*. | 30000 *+.*...*..*...*..*..*...*..*...*..*. *..*...*..* | O O O O O O O O O O O O O O O O O O O O 25000 ++ | | | 20000 ++ | | | 15000 ++ | 10000 ++ | | | 5000 ++ | | | 0 ++--------------------------------O---------------------------------+ [*] bisect-good sample [O] bisect-bad sample 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. Thanks, Xiaolong