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7c16d260-2c34-4a58-3a8d-08de6a4acfab X-MS-Exchange-CrossTenant-AuthSource: LV3PR11MB8603.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Feb 2026 15:24:27.8310 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: +8TevhoOiKEhe1u0jkCpLS9MmnYeZUuZLcJClpZwNqebluJdQ1VfBdzswg6qo6TdLJJ0CUzF4hLVFNyOyEGUBg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR11MB7799 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 6.5% regression of fio.write_iops on: commit: 4e159150a9a56d66d247f4b5510bed46fe58aa1c ("btrfs: do not strictly require dirty metadata threshold for metadata writepages") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [still regression on linus/master 6589b3d76db2d6adbf8f2084c303fb24252a0dc6] [still regression on linux-next/master fd9678829d6dd0c10fde080b536abf4b1121c346] 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: write bs: 4k ioengine: pvsync2 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/202602122319.d71b793c-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260212/202602122319.d71b793c-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/pvsync2/x86_64-rhel-9.4/1/debian-13-x86_64-20250902.cgz/300s/write/lkp-icl-2sp9/128G/fio-basic commit: 3430818739 ("btrfs: add extra device item checks at mount") 4e159150a9 ("btrfs: do not strictly require dirty metadata threshold for metadata writepages") 34308187395ff01f 4e159150a9a56d66d247f4b5510 ---------------- --------------------------- %stddev %change %stddev \ | \ 25998829 -6.1% 24422371 cpuidle..usage 1.06 +3.2% 1.09 iostat.cpu.iowait 1215 ± 3% -10.1% 1093 ± 3% meminfo.Dirty 80085 -6.5% 74897 vmstat.io.bo 121741 -6.4% 113948 vmstat.system.cs 87339 -6.0% 82083 vmstat.system.in 15.13 ± 50% +75.9% 26.62 ± 22% sched_debug.cfs_rq:/.removed.load_avg.avg 287273 -5.8% 270535 sched_debug.cpu.nr_switches.avg 1713834 ± 11% -19.8% 1374291 ± 11% sched_debug.cpu.nr_switches.max 418676 ± 7% -18.5% 341334 ± 11% sched_debug.cpu.nr_switches.stddev 47.67 -5.6% 45.00 turbostat.Avg_MHz 1.32 -0.1 1.26 turbostat.Busy% 32589252 -6.1% 30597064 turbostat.IRQ 94552 -5.0% 89817 turbostat.NMI 6080930 -6.5% 5686530 proc-vmstat.nr_dirtied 121315 -3.5% 117069 proc-vmstat.nr_slab_unreclaimable 6080407 -6.5% 5686054 proc-vmstat.nr_written 7057391 -5.6% 6658839 proc-vmstat.numa_hit 6991110 -5.7% 6592460 proc-vmstat.numa_local 7583554 -5.0% 7205949 proc-vmstat.pgalloc_normal 7342680 -5.0% 6976953 proc-vmstat.pgfree 24345737 -6.5% 22768702 proc-vmstat.pgpgout 0.01 +0.0 0.02 ± 12% fio.latency_1000us% 0.01 ± 19% +0.1 0.09 ± 22% fio.latency_2ms% 0.02 ± 23% +0.1 0.10 ± 21% fio.latency_4ms% 48595970 -6.5% 45440610 fio.time.file_system_outputs 25.67 -7.1% 23.83 fio.time.percent_of_cpu_this_job_got 71.70 -7.2% 66.52 fio.time.system_time 6108254 -6.5% 5713199 fio.time.voluntary_context_switches 6074496 -6.5% 5680076 fio.workload 79.09 -6.5% 73.96 fio.write_bw_MBps 48958 +7.0% 52394 fio.write_clat_mean_ns 250398 ± 2% +31.1% 328384 fio.write_clat_stddev 20248 -6.5% 18933 fio.write_iops 5.513e+08 -4.8% 5.247e+08 perf-stat.i.branch-instructions 21121264 -5.5% 19957666 ± 2% perf-stat.i.cache-references 122833 -6.4% 114967 perf-stat.i.context-switches 3.438e+09 -4.9% 3.269e+09 perf-stat.i.cpu-cycles 2.651e+09 -4.8% 2.523e+09 perf-stat.i.instructions 1.92 -6.4% 1.80 perf-stat.i.metric.K/sec 1.63 +0.1 1.71 perf-stat.overall.branch-miss-rate% 131286 +1.8% 133654 perf-stat.overall.path-length 5.496e+08 -4.8% 5.231e+08 perf-stat.ps.branch-instructions 21055046 -5.5% 19895494 ± 2% perf-stat.ps.cache-references 122422 -6.4% 114585 perf-stat.ps.context-switches 3.429e+09 -4.9% 3.261e+09 perf-stat.ps.cpu-cycles 2.643e+09 -4.8% 2.516e+09 perf-stat.ps.instructions 7.975e+11 -4.8% 7.592e+11 perf-stat.total.instructions 0.61 ± 6% +0.1 0.70 ± 5% perf-profile.calltrace.cycles-pp.try_to_block_task.__schedule.schedule.io_schedule.folio_wait_bit_common 0.68 ± 6% +0.1 0.78 ± 8% perf-profile.calltrace.cycles-pp.__sysvec_apic_timer_interrupt.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.pv_native_safe_halt.acpi_safe_halt 0.65 ± 6% +0.1 0.75 ± 8% perf-profile.calltrace.cycles-pp.hrtimer_interrupt.__sysvec_apic_timer_interrupt.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.pv_native_safe_halt 0.49 ± 45% +0.2 0.66 ± 5% perf-profile.calltrace.cycles-pp.dequeue_task_fair.try_to_block_task.__schedule.schedule.io_schedule 1.29 ± 5% +0.2 1.49 ± 8% perf-profile.calltrace.cycles-pp.io_schedule.folio_wait_bit_common.folio_wait_writeback.__filemap_fdatawait_range.filemap_fdatawait_range 1.24 ± 6% +0.2 1.44 ± 8% perf-profile.calltrace.cycles-pp.schedule.io_schedule.folio_wait_bit_common.folio_wait_writeback.__filemap_fdatawait_range 0.46 ± 45% +0.3 0.80 ± 29% perf-profile.calltrace.cycles-pp.dequeue_entities.dequeue_task_fair.try_to_block_task.__schedule.schedule 0.20 ± 6% -0.0 0.16 ± 12% perf-profile.children.cycles-pp.fio_gettime 0.08 ± 16% +0.0 0.11 ± 11% perf-profile.children.cycles-pp.rmqueue_pcplist 0.32 ± 6% +0.0 0.36 ± 10% perf-profile.children.cycles-pp.native_apic_msr_eoi 0.74 ± 5% +0.1 0.83 ± 6% perf-profile.children.cycles-pp.hrtimer_interrupt 1.29 ± 5% +0.2 1.49 ± 8% perf-profile.children.cycles-pp.io_schedule 0.20 ± 6% -0.0 0.16 ± 14% perf-profile.self.cycles-pp.fio_gettime 0.12 ± 24% -0.0 0.09 ± 10% perf-profile.self.cycles-pp.check_delayed_ref 0.02 ±141% +0.0 0.06 ± 9% perf-profile.self.cycles-pp.btrfs_csum_file_blocks 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