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X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 12.4% improvement of fio.write_iops on: commit: 551e510a97a487218d5f22d61d1a3388ef1171ac ("btrfs: don't force DIO writes to be serialized") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master testcase: fio-basic config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory parameters: runtime: 300s disk: 1HDD fs: btrfs nr_task: 1 test_size: 128G rw: randwrite bs: 4k ioengine: falloc cpufreq_governor: performance In addition to that, the commit also has significant impact on the following tests: +------------------+---------------------------------------------+ | testcase: change | fio-basic: fio.write_iops 10.9% improvement | | test parameters | bs=4k | | | cpufreq_governor=performance | | | disk=1HDD | | | fs=btrfs | | | ioengine=falloc | | | nr_task=1 | | | runtime=300s | | | rw=write | | | test_size=128G | +------------------+---------------------------------------------+ Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260529/202605291631.659bf248-lkp@intel.com ========================================================================================= bs/compiler/cpufreq_governor/disk/fs/ioengine/kconfig/nr_task/rootfs/runtime/rw/tbox_group/test_size/testcase: 4k/gcc-14/performance/1HDD/btrfs/falloc/x86_64-rhel-9.4/1/debian-13-x86_64-20250902.cgz/300s/randwrite/lkp-icl-2sp9/128G/fio-basic commit: 964f569c14 ("btrfs: limit size of bios submitted from writeback") 551e510a97 ("btrfs: don't force DIO writes to be serialized") 964f569c14d7778c 551e510a97a487218d5f22d61d1 ---------------- --------------------------- %stddev %change %stddev \ | \ 0.04 ± 5% -0.0 0.04 ± 5% fio.latency_4us% 5315 +12.4% 5976 fio.write_bw_MBps 510.67 -14.2% 438.00 fio.write_clat_90%_ns 515.00 -14.2% 442.00 fio.write_clat_95%_ns 522.67 -13.8% 450.67 fio.write_clat_99%_ns 496.01 -14.6% 423.39 fio.write_clat_mean_ns 1360660 +12.4% 1530010 fio.write_iops 1.67e+09 -10.0% 1.503e+09 cpuidle..time 1.48 +2.5% 1.51 iostat.cpu.system 42426 -6.0% 39867 ± 2% meminfo.AnonHugePages 165506 ± 3% -6.8% 154330 turbostat.IRQ 2392 +4.8% 2506 vmstat.system.cs 1945 +4.5% 2034 perf-stat.i.context-switches 1874 +4.1% 1949 perf-stat.ps.context-switches 1489031 ±110% +162.9% 3915040 ± 3% numa-meminfo.node0.FilePages 40746 ± 46% +72.2% 70177 ± 5% numa-meminfo.node0.KReclaimable 29851 ±122% +178.8% 83225 numa-meminfo.node0.Mapped 40746 ± 46% +72.2% 70177 ± 5% numa-meminfo.node0.SReclaimable 126444 ± 22% +29.1% 163254 ± 8% numa-meminfo.node0.Slab 1485610 ±110% +163.2% 3910117 ± 3% numa-meminfo.node0.Unevictable 2626454 ± 62% -92.4% 200365 ± 69% numa-meminfo.node1.FilePages 56220 ± 65% -95.9% 2321 ± 67% numa-meminfo.node1.Mapped 2622239 ± 62% -92.5% 197733 ± 70% numa-meminfo.node1.Unevictable 372258 ±110% +162.9% 978760 ± 3% numa-vmstat.node0.nr_file_pages 7462 ±122% +178.8% 20806 numa-vmstat.node0.nr_mapped 10186 ± 46% +72.2% 17544 ± 5% numa-vmstat.node0.nr_slab_reclaimable 371402 ±110% +163.2% 977529 ± 3% numa-vmstat.node0.nr_unevictable 371402 ±110% +163.2% 977529 ± 3% numa-vmstat.node0.nr_zone_unevictable 656614 ± 62% -92.4% 50091 ± 69% numa-vmstat.node1.nr_file_pages 14054 ± 65% -95.9% 580.52 ± 67% numa-vmstat.node1.nr_mapped 655559 ± 62% -92.5% 49433 ± 70% numa-vmstat.node1.nr_unevictable 655559 ± 62% -92.5% 49433 ± 70% numa-vmstat.node1.nr_zone_unevictable 80.52 ± 25% -58.3 22.22 ±147% perf-profile.calltrace.cycles-pp.__mmput.exit_mm.do_exit.do_group_exit.get_signal 80.52 ± 25% -58.3 22.22 ±147% perf-profile.calltrace.cycles-pp.exit_mm.do_exit.do_group_exit.get_signal.arch_do_signal_or_restart 80.52 ± 25% -56.6 23.89 ±144% perf-profile.calltrace.cycles-pp.exit_mmap.__mmput.exit_mm.do_exit.do_group_exit 68.85 ± 49% -50.0 18.89 ±163% perf-profile.calltrace.cycles-pp.unmap_page_range.unmap_vmas.exit_mmap.__mmput.exit_mm 68.85 ± 49% -50.0 18.89 ±163% perf-profile.calltrace.cycles-pp.zap_pmd_range.unmap_page_range.unmap_vmas.exit_mmap.__mmput 68.57 ± 49% -49.7 18.89 ±163% perf-profile.calltrace.cycles-pp.zap_pte_range.zap_pmd_range.unmap_page_range.unmap_vmas.exit_mmap 68.85 ± 49% -48.3 20.56 ±153% perf-profile.calltrace.cycles-pp.unmap_vmas.exit_mmap.__mmput.exit_mm.do_exit 70.24 ± 51% -48.0 22.22 ±147% perf-profile.calltrace.cycles-pp.arch_do_signal_or_restart.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe 70.24 ± 51% -48.0 22.22 ±147% perf-profile.calltrace.cycles-pp.do_exit.do_group_exit.get_signal.arch_do_signal_or_restart.exit_to_user_mode_loop 70.24 ± 51% -48.0 22.22 ±147% perf-profile.calltrace.cycles-pp.do_group_exit.get_signal.arch_do_signal_or_restart.exit_to_user_mode_loop.do_syscall_64 70.24 ± 51% -48.0 22.22 ±147% perf-profile.calltrace.cycles-pp.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe 70.24 ± 51% -48.0 22.22 ±147% perf-profile.calltrace.cycles-pp.get_signal.arch_do_signal_or_restart.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe 71.35 ± 48% -45.8 25.56 ±142% perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe 71.35 ± 48% -45.8 25.56 ±142% perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe 35.48 ± 64% -24.4 11.11 ±223% perf-profile.calltrace.cycles-pp.zap_present_ptes.zap_pte_range.zap_pmd_range.unmap_page_range.unmap_vmas 22.82 ± 62% -18.4 4.44 ±147% perf-profile.calltrace.cycles-pp.free_pages_and_swap_cache.__tlb_batch_free_encoded_pages.tlb_flush_mmu.zap_pte_range.zap_pmd_range 23.10 ± 64% -15.9 7.22 ±169% perf-profile.calltrace.cycles-pp.__tlb_batch_free_encoded_pages.tlb_flush_mmu.zap_pte_range.zap_pmd_range.unmap_page_range 23.10 ± 64% -15.9 7.22 ±169% perf-profile.calltrace.cycles-pp.tlb_flush_mmu.zap_pte_range.zap_pmd_range.unmap_page_range.unmap_vmas 12.38 ±118% -12.4 0.00 perf-profile.calltrace.cycles-pp.lruvec_stat_mod_folio.folio_remove_rmap_ptes.zap_present_ptes.zap_pte_range.zap_pmd_range 15.99 ±131% -10.4 5.56 ±223% perf-profile.calltrace.cycles-pp.folio_remove_rmap_ptes.zap_present_ptes.zap_pte_range.zap_pmd_range.unmap_page_range 12.38 ±143% -9.6 2.78 ±223% perf-profile.calltrace.cycles-pp.kthread.ret_from_fork.ret_from_fork_asm 12.38 ±143% -9.6 2.78 ±223% perf-profile.calltrace.cycles-pp.ret_from_fork.ret_from_fork_asm 12.38 ±143% -9.6 2.78 ±223% perf-profile.calltrace.cycles-pp.ret_from_fork_asm 11.71 ± 98% -7.3 4.44 ±147% perf-profile.calltrace.cycles-pp.folios_put_refs.free_pages_and_swap_cache.__tlb_batch_free_encoded_pages.tlb_flush_mmu.zap_pte_range 83.17 ± 23% -59.3 23.89 ±144% perf-profile.children.cycles-pp.__mmput 83.17 ± 23% -59.3 23.89 ±144% perf-profile.children.cycles-pp.exit_mmap 80.79 ± 24% -58.6 22.22 ±147% perf-profile.children.cycles-pp.arch_do_signal_or_restart 80.79 ± 24% -58.6 22.22 ±147% perf-profile.children.cycles-pp.get_signal 80.79 ± 24% -56.9 23.89 ±144% perf-profile.children.cycles-pp.do_exit 80.79 ± 24% -56.9 23.89 ±144% perf-profile.children.cycles-pp.do_group_exit 80.52 ± 25% -56.6 23.89 ±144% perf-profile.children.cycles-pp.exit_mm 75.95 ± 40% -50.4 25.56 ±142% perf-profile.children.cycles-pp.do_syscall_64 75.95 ± 40% -50.4 25.56 ±142% perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe 68.85 ± 49% -50.0 18.89 ±163% perf-profile.children.cycles-pp.unmap_page_range 68.85 ± 49% -50.0 18.89 ±163% perf-profile.children.cycles-pp.zap_pmd_range 68.85 ± 49% -50.0 18.89 ±163% perf-profile.children.cycles-pp.zap_pte_range 68.85 ± 49% -48.3 20.56 ±153% perf-profile.children.cycles-pp.unmap_vmas 70.24 ± 51% -48.0 22.22 ±147% perf-profile.children.cycles-pp.exit_to_user_mode_loop 35.20 ± 66% -26.9 8.33 ±223% perf-profile.children.cycles-pp.zap_present_ptes 23.10 ± 64% -15.9 7.22 ±169% perf-profile.children.cycles-pp.__tlb_batch_free_encoded_pages 23.10 ± 64% -15.9 7.22 ±169% perf-profile.children.cycles-pp.free_pages_and_swap_cache 23.10 ± 64% -15.9 7.22 ±169% perf-profile.children.cycles-pp.tlb_flush_mmu 19.33 ±102% -13.8 5.56 ±223% perf-profile.children.cycles-pp.folio_remove_rmap_ptes 12.38 ±143% -9.6 2.78 ±223% perf-profile.children.cycles-pp.kthread 12.38 ±143% -9.6 2.78 ±223% perf-profile.children.cycles-pp.ret_from_fork 12.38 ±143% -9.6 2.78 ±223% perf-profile.children.cycles-pp.ret_from_fork_asm 9.05 ±102% -9.0 0.00 perf-profile.children.cycles-pp.lruvec_stat_mod_folio 11.71 ± 98% -7.3 4.44 ±147% perf-profile.children.cycles-pp.folios_put_refs 15.60 ± 97% -15.6 0.00 perf-profile.self.cycles-pp.zap_present_ptes 13.61 ±107% -8.1 5.56 ±223% perf-profile.self.cycles-pp.folio_remove_rmap_ptes 10.28 ± 94% -6.9 3.33 ±223% perf-profile.self.cycles-pp.zap_pte_range *************************************************************************************************** ========================================================================================= bs/compiler/cpufreq_governor/disk/fs/ioengine/kconfig/nr_task/rootfs/runtime/rw/tbox_group/test_size/testcase: 4k/gcc-14/performance/1HDD/btrfs/falloc/x86_64-rhel-9.4/1/debian-13-x86_64-20250902.cgz/300s/write/lkp-icl-2sp9/128G/fio-basic commit: 964f569c14 ("btrfs: limit size of bios submitted from writeback") 551e510a97 ("btrfs: don't force DIO writes to be serialized") 964f569c14d7778c 551e510a97a487218d5f22d61d1 ---------------- --------------------------- %stddev %change %stddev \ | \ 0.04 ± 4% -0.0 0.04 ± 4% fio.latency_4us% 6156 +10.9% 6825 fio.write_bw_MBps 459.33 -13.5% 397.33 fio.write_clat_90%_ns 462.00 -13.7% 398.67 ± 2% fio.write_clat_95%_ns 466.67 -13.6% 403.33 ± 2% fio.write_clat_99%_ns 454.12 -14.1% 389.87 fio.write_clat_mean_ns 1575955 +10.9% 1747309 fio.write_iops 556943 ± 91% -62.8% 207326 ±184% sched_debug.cfs_rq:/.load.max 152355 ± 2% -7.7% 140620 ± 3% turbostat.IRQ 1.472e+09 ± 2% -9.2% 1.337e+09 cpuidle..time 99291 ± 3% -7.8% 91524 ± 4% cpuidle..usage 9.05 ±102% -9.0 0.00 perf-profile.calltrace.cycles-pp.free_pgtables.exit_mmap.__mmput.exit_mm.do_exit 9.05 ±102% -7.4 1.67 ±223% perf-profile.children.cycles-pp.free_pgtables 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