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X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 6.5% regression of fio.write_iops on: commit: f9a48549a15aa369d42cebc08a6a72b71a53d547 ("btrfs: inhibit extent buffer writeback to prevent COW amplification") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [still regression on linus/master 27d128c1cff64c3b8012cc56dd5a1391bb4f1821] [still regression on linux-next/master 7080e32d3f09d8688c4a87d81bdcc71f7f606b16] 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: vsync 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/202604291540.72917ba4-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260429/202604291540.72917ba4-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/vsync/x86_64-rhel-9.4/1/debian-13-x86_64-20250902.cgz/300s/randwrite/lkp-icl-2sp9/128G/fio-basic commit: cab4c8b594 ("btrfs: extract the max compression chunk size into a macro") f9a48549a1 ("btrfs: inhibit extent buffer writeback to prevent COW amplification") cab4c8b594e23649 f9a48549a15aa369d42cebc08a6 ---------------- --------------------------- %stddev %change %stddev \ | \ 0.89 +0.9 1.81 ± 13% fio.latency_1000us% 0.03 ± 9% +0.0 0.05 ± 14% fio.latency_100ms% 0.11 ± 4% +0.0 0.12 ± 8% fio.latency_10ms% 0.41 +0.0 0.43 fio.latency_20ms% 0.01 +0.0 0.02 ± 15% fio.latency_250ms% 0.32 ± 3% +0.1 0.41 ± 5% fio.latency_2ms% 38.01 -1.8 36.25 ± 2% fio.latency_500us% 3854021 -6.4% 3605989 fio.time.file_system_outputs 568393 -4.2% 544573 fio.time.voluntary_context_switches 481752 -6.4% 450748 fio.workload 6.27 -6.5% 5.86 fio.write_bw_MBps 453290 +2.3% 463530 fio.write_clat_95%_ns 1452714 +27.1% 1845930 ± 12% fio.write_clat_99%_ns 622412 +6.9% 665559 fio.write_clat_mean_ns 9945919 +2.6% 10208918 fio.write_clat_stddev 1605 -6.5% 1501 fio.write_iops 1.66 +7.0% 1.77 iostat.cpu.iowait 0.99 +7.2% 1.06 turbostat.IPC 1.66 +0.1 1.78 mpstat.cpu.all.iowait% 0.01 ± 9% +0.0 0.01 ± 9% mpstat.cpu.all.soft% 0.15 ± 2% +0.0 0.16 mpstat.cpu.all.sys% 11925 +43.4% 17095 ± 7% vmstat.io.bo 1.06 +7.4% 1.13 vmstat.procs.b 11590 -2.7% 11278 vmstat.system.cs 1.24 ± 4% -0.1 1.15 ± 2% perf-stat.i.branch-miss-rate% 494667 ± 4% +13.7% 562455 ± 6% perf-stat.i.cache-misses 3724781 ± 2% +6.8% 3976385 perf-stat.i.cache-references 11645 -2.7% 11330 perf-stat.i.context-switches 1.03 -8.8% 0.94 perf-stat.i.cpi 1.06 +11.7% 1.18 ± 2% perf-stat.i.ipc 3.98 ± 5% -0.5 3.53 ± 3% perf-stat.overall.branch-miss-rate% 1.07 -6.9% 0.99 perf-stat.overall.cpi 1739 ± 2% -10.3% 1561 ± 6% perf-stat.overall.cycles-between-cache-misses 0.94 +7.5% 1.01 perf-stat.overall.ipc 504122 ± 4% +17.0% 589787 ± 2% perf-stat.overall.path-length 493093 ± 4% +13.7% 560650 ± 6% perf-stat.ps.cache-misses 3715678 ± 2% +6.7% 3966204 perf-stat.ps.cache-references 11607 -2.7% 11293 perf-stat.ps.context-switches 0.68 ± 20% -0.4 0.30 ±100% perf-profile.calltrace.cycles-pp.__schedule.schedule.io_schedule.folio_wait_bit_common.folio_wait_writeback 0.70 ± 19% -0.3 0.40 ± 71% perf-profile.calltrace.cycles-pp.io_schedule.folio_wait_bit_common.folio_wait_writeback.__filemap_fdatawait_range.filemap_fdatawait_range 1.18 ± 15% +0.4 1.57 ± 11% perf-profile.calltrace.cycles-pp.__irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.pv_native_safe_halt.acpi_safe_halt 1.12 ± 14% +0.4 1.51 ± 12% perf-profile.calltrace.cycles-pp.handle_softirqs.__irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.pv_native_safe_halt 0.45 ± 72% +0.5 0.96 ± 12% perf-profile.calltrace.cycles-pp.rcu_core.handle_softirqs.__irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt 0.30 ±100% +0.5 0.84 ± 11% perf-profile.calltrace.cycles-pp.rcu_do_batch.rcu_core.handle_softirqs.__irq_exit_rcu.sysvec_apic_timer_interrupt 0.00 +0.6 0.63 ± 7% perf-profile.calltrace.cycles-pp.kmem_cache_free.rcu_do_batch.rcu_core.handle_softirqs.__irq_exit_rcu 0.00 +0.9 0.90 ± 17% perf-profile.calltrace.cycles-pp.xas_find.xa_find_after.btrfs_uninhibit_all_eb_writeback.__btrfs_end_transaction.btrfs_finish_one_ordered 0.00 +1.0 0.96 ± 16% perf-profile.calltrace.cycles-pp.xa_find_after.btrfs_uninhibit_all_eb_writeback.__btrfs_end_transaction.btrfs_finish_one_ordered.btrfs_work_helper 0.00 +2.1 2.09 ± 18% perf-profile.calltrace.cycles-pp.btrfs_uninhibit_all_eb_writeback.__btrfs_end_transaction.btrfs_finish_one_ordered.btrfs_work_helper.process_one_work 0.00 +2.2 2.16 ± 18% perf-profile.calltrace.cycles-pp.__btrfs_end_transaction.btrfs_finish_one_ordered.btrfs_work_helper.process_one_work.worker_thread 0.34 ± 79% -0.3 0.06 ± 73% perf-profile.children.cycles-pp.memcpy_extent_buffer 0.46 ± 12% -0.1 0.33 ± 15% perf-profile.children.cycles-pp.tick_nohz_get_sleep_length 0.16 ± 40% -0.1 0.04 ±107% perf-profile.children.cycles-pp.lock_extent_buffer_for_io 0.47 ± 16% -0.1 0.38 ± 15% perf-profile.children.cycles-pp.update_load_avg 0.13 ± 23% -0.1 0.06 ± 62% perf-profile.children.cycles-pp.menu_reflect 0.04 ± 72% +0.1 0.10 ± 9% perf-profile.children.cycles-pp.__mem_cgroup_charge 0.04 ± 73% +0.1 0.12 ± 29% perf-profile.children.cycles-pp.scsi_dma_map 0.10 ± 41% +0.1 0.18 ± 34% perf-profile.children.cycles-pp.lookup_extent_backref 0.02 ±141% +0.1 0.10 ± 30% perf-profile.children.cycles-pp.__dma_map_sg_attrs 0.02 ±141% +0.1 0.10 ± 29% perf-profile.children.cycles-pp.dma_map_sg_attrs 0.04 ± 77% +0.1 0.13 ± 33% perf-profile.children.cycles-pp.___perf_sw_event 0.22 ± 16% +0.1 0.31 ± 19% perf-profile.children.cycles-pp.__call_rcu_common 0.14 ± 30% +0.1 0.24 ± 24% perf-profile.children.cycles-pp.lookup_inline_extent_backref 0.07 ± 55% +0.1 0.19 ± 18% perf-profile.children.cycles-pp.__refill_objects_node 0.14 ± 54% +0.1 0.26 ± 19% perf-profile.children.cycles-pp.__memcg_slab_free_hook 0.20 ± 26% +0.1 0.34 ± 16% perf-profile.children.cycles-pp.__pcs_replace_empty_main 0.38 ± 18% +0.2 0.56 ± 11% perf-profile.children.cycles-pp.xas_alloc 0.04 ±110% +0.2 0.25 ± 22% perf-profile.children.cycles-pp.xa_find 0.09 ± 46% +0.2 0.32 ± 97% perf-profile.children.cycles-pp.__pcs_replace_full_main 0.46 ± 26% +0.3 0.78 ± 11% perf-profile.children.cycles-pp.xas_create 0.04 ±108% +0.4 0.44 ± 23% perf-profile.children.cycles-pp.__xa_store 0.66 ± 26% +0.4 1.05 ± 10% perf-profile.children.cycles-pp.rcu_core 0.52 ± 29% +0.4 0.92 ± 10% perf-profile.children.cycles-pp.rcu_do_batch 0.04 ±108% +0.4 0.49 ± 23% perf-profile.children.cycles-pp.xa_store 0.00 +0.7 0.69 ± 23% perf-profile.children.cycles-pp.xas_free_nodes 0.00 +0.7 0.72 ± 25% perf-profile.children.cycles-pp.xa_destroy 0.00 +0.8 0.76 ± 20% perf-profile.children.cycles-pp.btrfs_inhibit_eb_writeback 0.00 +1.0 0.96 ± 17% perf-profile.children.cycles-pp.xa_find_after 0.50 ± 7% +1.1 1.62 ± 15% perf-profile.children.cycles-pp.xas_find 0.00 +2.1 2.11 ± 18% perf-profile.children.cycles-pp.btrfs_uninhibit_all_eb_writeback 0.04 ± 77% +2.1 2.17 ± 18% perf-profile.children.cycles-pp.__btrfs_end_transaction 0.12 ± 23% -0.1 0.04 ±105% perf-profile.self.cycles-pp.finish_task_switch 0.01 ±223% +0.1 0.10 ± 35% perf-profile.self.cycles-pp.xa_load 0.00 +0.1 0.09 ± 33% perf-profile.self.cycles-pp.btrfs_uninhibit_all_eb_writeback 0.04 ± 77% +0.1 0.14 ± 34% perf-profile.self.cycles-pp.__call_rcu_common 0.06 ± 58% +0.1 0.18 ± 19% perf-profile.self.cycles-pp.__refill_objects_node 0.05 ±104% +0.1 0.20 ± 22% perf-profile.self.cycles-pp.__memcg_slab_free_hook 0.06 ±100% +0.2 0.21 ± 23% perf-profile.self.cycles-pp.xas_create 0.45 ± 25% +0.2 0.65 ± 17% perf-profile.self.cycles-pp.kmem_cache_free 0.00 +0.6 0.56 ± 19% perf-profile.self.cycles-pp.xas_free_nodes 0.01 ±223% +1.1 1.08 ± 15% perf-profile.self.cycles-pp.xas_find 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