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X-MS-Exchange-CrossTenant-UserPrincipalName: a87eUh7qL1CBu/8qCj0obJVoB+VUxgzIBtGfVDZUocfon9DmZrMWMKjqQggclhxWvFAI54SqH3qRllf9JMf9Fw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY5PR11MB6487 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 44.2% regression of stress-ng.sync-file.ops_per_sec on: commit: bddf57a70781ef8821d415200bdbcb71f443993a ("btrfs: delay btrfs_open_devices() until super block is created") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master [still regression on linus/master fb679c832b6497f19fffb8274c419783909c0912] [still regression on linux-next/master 3cace99d63192a7250461b058279a42d91075d0c] testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-12 test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory parameters: nr_threads: 100% disk: 1HDD testtime: 60s fs: btrfs test: sync-file 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/202509031643.303d114c-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250903/202509031643.303d114c-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/disk/fs/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime: gcc-12/performance/1HDD/btrfs/x86_64-rhel-9.4/100%/debian-12-x86_64-20240206.cgz/lkp-icl-2sp8/sync-file/stress-ng/60s commit: de339cbfb4 ("btrfs: call bdev_fput() to reclaim the blk_holder immediately") bddf57a707 ("btrfs: delay btrfs_open_devices() until super block is created") de339cbfb4027957 bddf57a70781ef8821d415200bd ---------------- --------------------------- %stddev %change %stddev \ | \ 1885182 ± 2% -35.0% 1226241 cpuidle..usage 1.35 ± 3% +26.8% 1.71 ± 31% iostat.cpu.iowait 114330 -10.0% 102922 meminfo.Shmem 17680 ± 2% -39.7% 10656 ± 2% vmstat.system.cs 32084 ± 3% -33.6% 21290 ± 2% vmstat.system.in 0.08 ± 2% -0.0 0.05 ± 2% mpstat.cpu.all.irq% 0.03 ± 6% -0.0 0.02 ± 5% mpstat.cpu.all.soft% 0.66 ± 3% -0.2 0.45 ± 2% mpstat.cpu.all.sys% 311692 ± 9% -17.9% 255869 ± 12% numa-numastat.node0.numa_hit 304181 ± 8% -24.2% 230456 ± 20% numa-numastat.node1.local_node 331109 ± 6% -19.3% 267048 ± 11% numa-numastat.node1.numa_hit 311531 ± 9% -17.9% 255766 ± 13% numa-vmstat.node0.numa_hit 330584 ± 6% -19.3% 266623 ± 10% numa-vmstat.node1.numa_hit 303656 ± 8% -24.2% 230030 ± 20% numa-vmstat.node1.numa_local 59.00 ± 13% -41.5% 34.50 ± 10% perf-c2c.DRAM.local 1139 ± 4% -46.1% 613.67 ± 5% perf-c2c.DRAM.remote 1254 ± 5% -45.3% 686.50 ± 2% perf-c2c.HITM.local 681.33 ± 3% -45.8% 369.50 ± 6% perf-c2c.HITM.remote 1.33 ± 41% -93.8% 0.08 ±223% sched_debug.cfs_rq:/.runnable_avg.min 1.33 ± 41% -93.8% 0.08 ±223% sched_debug.cfs_rq:/.util_avg.min 10502 -34.4% 6886 sched_debug.cpu.nr_switches.avg 8094 ± 2% -41.8% 4710 ± 2% sched_debug.cpu.nr_switches.min 21146 ± 2% -44.2% 11809 stress-ng.sync-file.ops 352.20 ± 2% -44.2% 196.65 stress-ng.sync-file.ops_per_sec 34.00 ± 2% -43.6% 19.17 stress-ng.time.percent_of_cpu_this_job_got 20.20 ± 2% -43.6% 11.38 stress-ng.time.system_time 513054 ± 2% -45.5% 279629 stress-ng.time.voluntary_context_switches 28437 -10.3% 25522 proc-vmstat.nr_shmem 25303 -1.0% 25040 proc-vmstat.nr_slab_reclaimable 644388 -18.6% 524319 proc-vmstat.numa_hit 578153 -20.8% 458095 proc-vmstat.numa_local 682807 -18.2% 558809 proc-vmstat.pgalloc_normal 675599 -18.3% 551960 ± 2% proc-vmstat.pgfree 1.61 -5.0% 1.53 perf-stat.i.MPKI 6.692e+08 ± 3% -8.2% 6.144e+08 ± 6% perf-stat.i.branch-instructions 23.54 -2.2 21.29 perf-stat.i.cache-miss-rate% 2665211 ± 3% -27.0% 1946091 ± 4% perf-stat.i.cache-misses 12037045 ± 3% -18.2% 9840696 ± 3% perf-stat.i.cache-references 18418 ± 3% -40.1% 11025 perf-stat.i.context-switches 2.13 -5.4% 2.01 perf-stat.i.cpi 3.964e+09 ± 3% -19.8% 3.177e+09 ± 4% perf-stat.i.cpu-cycles 181.54 ± 3% -23.8% 138.31 ± 4% perf-stat.i.cpu-migrations 1472 +7.4% 1581 perf-stat.i.cycles-between-cache-misses 3.216e+09 ± 3% -7.6% 2.972e+09 ± 6% perf-stat.i.instructions 0.65 +8.4% 0.71 ± 2% perf-stat.i.ipc 0.83 -20.9% 0.66 ± 2% perf-stat.overall.MPKI 4.24 +0.3 4.58 ± 2% perf-stat.overall.branch-miss-rate% 22.13 -2.4 19.76 perf-stat.overall.cache-miss-rate% 1.23 -13.1% 1.07 ± 2% perf-stat.overall.cpi 1488 +9.8% 1634 perf-stat.overall.cycles-between-cache-misses 0.81 +15.1% 0.93 ± 2% perf-stat.overall.ipc 6.587e+08 ± 3% -8.2% 6.047e+08 ± 6% perf-stat.ps.branch-instructions 2623092 ± 3% -27.0% 1915109 ± 4% perf-stat.ps.cache-misses 11851537 ± 3% -18.3% 9688099 ± 3% perf-stat.ps.cache-references 18125 ± 3% -40.2% 10847 perf-stat.ps.context-switches 3.903e+09 ± 3% -19.8% 3.129e+09 ± 4% perf-stat.ps.cpu-cycles 178.73 ± 3% -23.8% 136.12 ± 4% perf-stat.ps.cpu-migrations 3.166e+09 ± 3% -7.6% 2.925e+09 ± 6% perf-stat.ps.instructions 2.004e+11 -9.3% 1.818e+11 ± 5% perf-stat.total.instructions 0.00 ±223% +4160.0% 0.04 ± 35% perf-sched.sch_delay.avg.ms.schedule_preempt_disabled.__mutex_lock.constprop.0.btrfs_create_pending_block_groups 0.01 -100.0% 0.00 perf-sched.sch_delay.avg.ms.schedule_timeout.btrfs_sync_log.btrfs_sync_file.do_fsync 0.01 ± 15% +246.8% 0.03 ± 96% perf-sched.sch_delay.max.ms.__cond_resched.__wait_for_common.barrier_all_devices.write_all_supers.btrfs_sync_log 0.00 ±223% +4180.0% 0.04 ± 35% perf-sched.sch_delay.max.ms.schedule_preempt_disabled.__mutex_lock.constprop.0.btrfs_create_pending_block_groups 0.02 ± 98% -100.0% 0.00 perf-sched.sch_delay.max.ms.schedule_timeout.btrfs_sync_log.btrfs_sync_file.do_fsync 0.16 ±106% -77.8% 0.04 ± 39% perf-sched.sch_delay.max.ms.wait_log_commit.btrfs_sync_log.btrfs_sync_file.do_fsync 27.42 ± 3% +53.9% 42.21 ± 4% perf-sched.total_wait_and_delay.average.ms 40831 ± 3% -36.6% 25906 ± 4% perf-sched.total_wait_and_delay.count.ms 27.41 ± 3% +54.0% 42.21 ± 4% perf-sched.total_wait_time.average.ms 229.23 ± 2% +51.7% 347.78 ± 15% perf-sched.wait_and_delay.avg.ms.irq_thread.kthread.ret_from_fork.ret_from_fork_asm 12.64 ± 3% +56.9% 19.84 ± 3% perf-sched.wait_and_delay.avg.ms.schedule_preempt_disabled.rwsem_down_read_slowpath.down_read.btrfs_tree_read_lock_nested 2.33 ± 11% +63.7% 3.81 ± 18% perf-sched.wait_and_delay.avg.ms.schedule_preempt_disabled.rwsem_down_write_slowpath.down_write.btrfs_tree_lock_nested 6.94 ± 2% +29.6% 9.00 ± 11% perf-sched.wait_and_delay.avg.ms.schedule_timeout.rcu_gp_fqs_loop.rcu_gp_kthread.kthread 0.31 ± 5% +421.7% 1.64 ± 25% perf-sched.wait_and_delay.avg.ms.wait_log_commit.btrfs_sync_log.btrfs_sync_file.do_fsync 18.67 ± 5% -35.7% 12.00 ± 16% perf-sched.wait_and_delay.count.irq_thread.kthread.ret_from_fork.ret_from_fork_asm 22342 ± 4% -40.1% 13375 ± 4% perf-sched.wait_and_delay.count.schedule_preempt_disabled.rwsem_down_read_slowpath.down_read.btrfs_tree_read_lock_nested 9405 ± 4% -40.8% 5564 ± 4% perf-sched.wait_and_delay.count.schedule_preempt_disabled.rwsem_down_write_slowpath.down_write.btrfs_tree_lock_nested 666.83 ± 2% -22.5% 516.50 ± 10% perf-sched.wait_and_delay.count.schedule_timeout.rcu_gp_fqs_loop.rcu_gp_kthread.kthread 4582 ± 4% -37.4% 2866 ± 5% perf-sched.wait_and_delay.count.wait_log_commit.btrfs_sync_log.btrfs_sync_file.do_fsync 5.34 ± 21% +756.6% 45.72 ± 4% perf-sched.wait_time.avg.ms.io_schedule.bit_wait_io.__wait_on_bit.out_of_line_wait_on_bit 22.83 ± 2% +15.9% 26.46 ± 8% perf-sched.wait_time.avg.ms.io_schedule.folio_wait_bit_common.write_all_supers.btrfs_sync_log 229.23 ± 2% +51.6% 347.59 ± 15% perf-sched.wait_time.avg.ms.irq_thread.kthread.ret_from_fork.ret_from_fork_asm 12.63 ± 3% +57.1% 19.83 ± 3% perf-sched.wait_time.avg.ms.schedule_preempt_disabled.rwsem_down_read_slowpath.down_read.btrfs_tree_read_lock_nested 2.32 ± 12% +64.0% 3.81 ± 18% perf-sched.wait_time.avg.ms.schedule_preempt_disabled.rwsem_down_write_slowpath.down_write.btrfs_tree_lock_nested 8.58 ± 9% -100.0% 0.00 perf-sched.wait_time.avg.ms.schedule_timeout.btrfs_sync_log.btrfs_sync_file.do_fsync 6.94 ± 2% +29.6% 8.99 ± 11% perf-sched.wait_time.avg.ms.schedule_timeout.rcu_gp_fqs_loop.rcu_gp_kthread.kthread 0.31 ± 5% +427.4% 1.63 ± 25% perf-sched.wait_time.avg.ms.wait_log_commit.btrfs_sync_log.btrfs_sync_file.do_fsync 101.57 ± 20% +56.6% 159.06 ± 22% perf-sched.wait_time.max.ms.io_schedule.bit_wait_io.__wait_on_bit.out_of_line_wait_on_bit 116.41 ± 27% -100.0% 0.00 perf-sched.wait_time.max.ms.schedule_timeout.btrfs_sync_log.btrfs_sync_file.do_fsync 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