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b7664815-0762-47d9-bab0-08de6aa431fd X-MS-Exchange-CrossTenant-AuthSource: LV3PR11MB8603.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Feb 2026 02:04:18.1225 (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: sgTAVKPtciB7IddcdwRGhIBB6nPPWV7VDbdCo+fsRmvfzauG/dPyNKI05YIATnmERdu8fSTV83UXAudLCu4OrQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR11MB7966 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 15.2% regression of postmark.transactions on: commit: e491b8e4300585da77a96251f77577ebcaa7c5fc ("nfsd: remove NFSD_V4_DELEG_TIMESTAMPS Kconfig option") https://git.kernel.org/cgit/linux/kernel/git/cel/linux nfsd-testing testcase: postmark config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 224 threads 4 sockets Intel(R) Xeon(R) Platinum 8380H CPU @ 2.90GHz (Cooper Lake) with 192G memory parameters: disk: 1HDD fs: ext4 fs1: nfsv4 number: 1000n trans: 10000s subdirs: 100d 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/202602130940.4cf74a62-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260213/202602130940.4cf74a62-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/disk/fs1/fs/kconfig/number/rootfs/subdirs/tbox_group/testcase/trans: gcc-14/performance/1HDD/nfsv4/ext4/x86_64-rhel-9.4/1000n/debian-13-x86_64-20250902.cgz/100d/lkp-cpl-4sp2/postmark/10000s commit: 49b14981e9 ("nfsd: add a runtime switch for disabling delegated timestamps") e491b8e430 ("nfsd: remove NFSD_V4_DELEG_TIMESTAMPS Kconfig option") 49b14981e913ca6a e491b8e4300585da77a96251f77 ---------------- --------------------------- %stddev %change %stddev \ | \ 0.00 -0.0 0.00 ± 2% mpstat.cpu.all.usr% 115863 -7.5% 107174 ± 6% numa-numastat.node0.other_node 2.657e+08 +17.2% 3.114e+08 turbostat.IRQ 102394 +15.4% 118164 vmstat.memory.buff 2.634e+11 +17.2% 3.088e+11 cpuidle..time 2.652e+08 +17.2% 3.108e+08 cpuidle..usage 1291 +15.7% 1494 uptime.boot 284803 +15.8% 329732 uptime.idle 102296 +15.5% 118107 meminfo.Buffers 177444 +8.3% 192096 meminfo.Inactive 177444 +8.3% 192096 meminfo.Inactive(file) 2980 -1.3% 2940 perf-stat.i.context-switches 234.45 -1.2% 231.74 perf-stat.i.cpu-migrations 2977 -1.3% 2938 perf-stat.ps.context-switches 234.25 -1.1% 231.57 perf-stat.ps.cpu-migrations 1.508e+12 +16.6% 1.759e+12 perf-stat.total.instructions 14498 ± 95% +2523.2% 380328 ±110% numa-vmstat.node0.nr_file_pages 2.11 ± 83% +3.4e+05% 7159 ±120% numa-vmstat.node0.nr_mapped 7603 ± 8% +89.3% 14395 ± 30% numa-vmstat.node0.nr_slab_reclaimable 115863 -7.5% 107174 ± 6% numa-vmstat.node0.numa_other 881153 -77.8% 195595 ±167% numa-vmstat.node1.nr_file_pages 493.21 ± 22% -28.2% 354.06 ± 20% numa-vmstat.node1.nr_page_table_pages 18656 ± 11% -51.0% 9134 ± 56% numa-vmstat.node1.nr_slab_reclaimable 859699 -79.3% 177669 ±189% numa-vmstat.node1.nr_unevictable 859699 -79.3% 177669 ±189% numa-vmstat.node1.nr_zone_unevictable 28413 ±130% +136.9% 67303 ± 45% numa-vmstat.node2.nr_anon_pages 57993 ± 95% +2523.3% 1521337 ±110% numa-meminfo.node0.FilePages 30413 ± 8% +89.3% 57581 ± 30% numa-meminfo.node0.KReclaimable 8.46 ± 83% +3.4e+05% 28639 ±120% numa-meminfo.node0.Mapped 30413 ± 8% +89.3% 57581 ± 30% numa-meminfo.node0.SReclaimable 142923 ± 4% +23.1% 175930 ± 9% numa-meminfo.node0.Slab 3524608 -77.8% 782383 ±167% numa-meminfo.node1.FilePages 74624 ± 11% -51.0% 36538 ± 56% numa-meminfo.node1.KReclaimable 1968 ± 22% -28.0% 1417 ± 20% numa-meminfo.node1.PageTables 74624 ± 11% -51.0% 36538 ± 56% numa-meminfo.node1.SReclaimable 3438799 -79.3% 710678 ±189% numa-meminfo.node1.Unevictable 113654 ±130% +136.9% 269213 ± 45% numa-meminfo.node2.AnonPages 623405 ± 5% +231.4% 2066089 ± 81% numa-meminfo.node2.MemUsed 75814 +2.9% 78028 proc-vmstat.nr_dirtied 44356 +8.3% 48032 proc-vmstat.nr_inactive_file 40258 +1.1% 40713 proc-vmstat.nr_slab_reclaimable 75355 +3.0% 77604 proc-vmstat.nr_written 44356 +8.3% 48032 proc-vmstat.nr_zone_inactive_file 3089765 +12.8% 3486001 proc-vmstat.numa_hit 2741896 +14.5% 3138225 proc-vmstat.numa_local 3492032 +12.2% 3917120 proc-vmstat.pgalloc_normal 3585459 +16.3% 4168177 proc-vmstat.pgfault 3358355 +12.4% 3774423 proc-vmstat.pgfree 778674 +9.6% 853071 proc-vmstat.pgpgout 150505 +16.4% 175141 proc-vmstat.pgreuse 4.85 -15.3% 4.11 postmark.creation_mixed_trans 71148 -14.9% 60564 postmark.data_read 84089 -14.9% 71580 postmark.data_written 19.53 -30.9% 13.50 postmark.deletion_alone 4.98 -15.2% 4.22 postmark.deletion_mixed_trans 4.87 -15.4% 4.12 postmark.files_appended 5.10 -14.9% 4.34 postmark.files_created 5.10 -14.9% 4.34 postmark.files_deleted 4.94 -15.3% 4.18 postmark.files_read 1174 +17.3% 1377 postmark.time.elapsed_time 1174 +17.3% 1377 postmark.time.elapsed_time.max 43653 -1.7% 42917 postmark.time.voluntary_context_switches 9.83 -15.2% 8.33 postmark.transactions 1.76 -0.1 1.68 perf-profile.calltrace.cycles-pp.sched_balance_rq.sched_balance_domains.handle_softirqs.__irq_exit_rcu.sysvec_apic_timer_interrupt 1.89 -0.1 1.82 ± 2% perf-profile.calltrace.cycles-pp.sched_balance_domains.handle_softirqs.__irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt 1.22 ± 2% -0.1 1.16 perf-profile.calltrace.cycles-pp.sched_balance_find_src_group.sched_balance_rq.sched_balance_domains.handle_softirqs.__irq_exit_rcu 1.12 -0.0 1.08 perf-profile.calltrace.cycles-pp.update_sd_lb_stats.sched_balance_find_src_group.sched_balance_rq.sched_balance_domains.handle_softirqs 1.89 -0.1 1.80 perf-profile.children.cycles-pp.sched_balance_rq 1.35 ± 2% -0.1 1.28 perf-profile.children.cycles-pp.sched_balance_find_src_group 1.91 ± 2% -0.1 1.84 ± 2% perf-profile.children.cycles-pp.sched_balance_domains 1.25 -0.1 1.19 perf-profile.children.cycles-pp.update_sd_lb_stats 0.36 ± 3% -0.1 0.30 ± 8% perf-profile.children.cycles-pp.ksys_read 0.95 ± 3% -0.0 0.90 perf-profile.children.cycles-pp.update_sg_lb_stats 0.08 ± 10% -0.0 0.06 ± 12% perf-profile.children.cycles-pp.filemap_map_pages 0.08 ± 11% -0.0 0.07 ± 12% perf-profile.children.cycles-pp.do_read_fault 0.27 ± 6% +0.0 0.30 ± 9% perf-profile.children.cycles-pp.timerqueue_del 0.42 ± 2% +0.1 0.50 ± 2% perf-profile.children.cycles-pp.update_rq_clock 0.19 ± 5% -0.0 0.14 ± 15% perf-profile.self.cycles-pp.update_rq_clock_task 0.08 ± 17% -0.0 0.05 ± 55% perf-profile.self.cycles-pp.invoke_rcu_core 0.09 ± 14% +0.0 0.11 ± 10% perf-profile.self.cycles-pp.ct_kernel_enter 0.27 ± 7% +0.0 0.32 ± 6% perf-profile.self.cycles-pp.acpi_idle_enter 2.38 ± 67% -62.1% 0.90 ± 42% sched_debug.cfs_rq:/.removed.runnable_avg.avg 2.38 ± 67% -62.1% 0.90 ± 42% sched_debug.cfs_rq:/.removed.util_avg.avg 685672 +13.2% 775891 sched_debug.cpu.clock.avg 685684 +13.2% 775903 sched_debug.cpu.clock.max 685660 +13.2% 775880 sched_debug.cpu.clock.min 681754 +13.1% 771301 sched_debug.cpu.clock_task.avg 682275 +13.1% 771929 sched_debug.cpu.clock_task.max 668165 +13.4% 757950 sched_debug.cpu.clock_task.min 142.32 ± 4% +13.6% 161.75 sched_debug.cpu.curr->pid.avg 28132 +10.8% 31168 sched_debug.cpu.curr->pid.max 1934 +11.2% 2151 sched_debug.cpu.curr->pid.stddev 0.01 ± 4% +8.8% 0.01 ± 6% sched_debug.cpu.nr_running.avg 8672 +13.0% 9796 sched_debug.cpu.nr_switches.avg 2248 +14.2% 2566 sched_debug.cpu.nr_switches.min 19783 ± 10% +20.7% 23875 ± 10% sched_debug.cpu.nr_switches.stddev 5.44 ± 6% +13.9% 6.19 ± 5% sched_debug.cpu.nr_uninterruptible.stddev 685660 +13.2% 775880 sched_debug.cpu_clk 684805 +13.2% 775024 sched_debug.ktime 686649 +13.1% 776915 sched_debug.sched_clk 0.89 -11.1% 0.79 nfsstat.Client.nfs.v4.access.percent 4.36 ± 2% -7.6% 4.03 ± 2% nfsstat.Client.nfs.v4.close.percent 1.32 -12.3% 1.16 nfsstat.Client.nfs.v4.create.percent 0.01 -14.7% 0.01 nfsstat.Client.nfs.v4.create_session.percent 3655 +11.0% 4058 nfsstat.Client.nfs.v4.delegreturn 15.03 +8.7% 16.33 nfsstat.Client.nfs.v4.delegreturn.percent 0.02 -14.5% 0.02 nfsstat.Client.nfs.v4.exchange_id.percent 0.02 -14.5% 0.02 nfsstat.Client.nfs.v4.fsinfo.percent 10.49 -5.6% 9.90 nfsstat.Client.nfs.v4.getattr.percent 0.04 -14.7% 0.03 nfsstat.Client.nfs.v4.lookup.percent 0.01 -14.7% 0.01 nfsstat.Client.nfs.v4.lookup_root.percent 0.01 -14.7% 0.01 nfsstat.Client.nfs.v4.null.percent 1417 +21.0% 1714 nfsstat.Client.nfs.v4.open_noat 5.88 +14.9% 6.76 nfsstat.Client.nfs.v4.open_noat.percent 0.02 -14.5% 0.02 nfsstat.Client.nfs.v4.pathconf.percent 0.01 -14.7% 0.01 nfsstat.Client.nfs.v4.reclaim_comp.percent 0.01 -14.7% 0.01 nfsstat.Client.nfs.v4.secinfo_no.percent 0.05 -14.6% 0.05 nfsstat.Client.nfs.v4.server_caps.percent 0.01 -14.7% 0.01 nfsstat.Client.nfs.v4.setattr.percent 0.01 -14.7% 0.01 nfsstat.Server.nfs.v4.null.percent 4809 +7.5% 5172 nfsstat.Server.nfs.v4.operations.access 0.66 ± 2% -12.6% 0.57 ± 3% nfsstat.Server.nfs.v4.operations.close.percent 0.20 -14.6% 0.17 nfsstat.Server.nfs.v4.operations.create.percent 0.00 -14.7% 0.00 nfsstat.Server.nfs.v4.operations.create_ses.percent 3656 +11.0% 4057 nfsstat.Server.nfs.v4.operations.delegreturn 3.54 +4.3% 3.69 nfsstat.Server.nfs.v4.operations.delegreturn.percent 0.00 -14.7% 0.00 nfsstat.Server.nfs.v4.operations.exchange_id.percent 11939 +5.6% 12607 nfsstat.Server.nfs.v4.operations.getattr 4.77 -10.5% 4.27 nfsstat.Server.nfs.v4.operations.getfh.percent 0.01 -14.7% 0.01 nfsstat.Server.nfs.v4.operations.lookup.percent 4708 +7.7% 5070 nfsstat.Server.nfs.v4.operations.open 0.00 -14.7% 0.00 nfsstat.Server.nfs.v4.operations.putrootfh.percent 0.00 -14.7% 0.00 nfsstat.Server.nfs.v4.operations.reclaim_comp.percent 0.00 -14.7% 0.00 nfsstat.Server.nfs.v4.operations.secinfononam.percent 1.00 +3.4e+05% 3381 nfsstat.Server.nfs.v4.operations.setattr 0.00 +1.8e+05% 3.09 nfsstat.Server.nfs.v4.operations.setattr.percent 6.87 -8.8% 6.27 nfsstat.Server.nfs.v4.operations.write.percent 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