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Message-ID: <202512221355.7a45e5d4-lkp@intel.com>
Date: Mon, 22 Dec 2025 13:59:40 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
Dietmar Eggemann <dietmar.eggemann@....com>, Chris Mason <clm@...a.com>,
<aubrey.li@...ux.intel.com>, <yu.c.chen@...el.com>, <oliver.sang@...el.com>
Subject: [linus:master] [sched/fair] 33cf66d883: hackbench.throughput 17.8%
regression
Hello,
we reported
"[tip:sched/core] [sched/fair] 33cf66d883: vm-scalability.throughput 3.9% improvement"
in
https://lore.kernel.org/all/202511251755.6e00cfb9-lkp@intel.com/
now the commit is in mainline, and we captured a regression from hackbench
tests. vm-scalability improvements are still included in the report. FYI.
kernel test robot noticed a 17.8% regression of hackbench.throughput on:
commit: 33cf66d88306663d16e4759e9d24766b0aaa2e17 ("sched/fair: Proportional newidle balance")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
[still regression on linus/master dd9b004b7ff3289fb7bae35130c0a5c0537266af]
[still regression on linux-next/master cc3aa43b44bdb43dfbac0fcb51c56594a11338a8]
testcase: hackbench
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:
nr_threads: 100%
iterations: 4
mode: threads
ipc: pipe
cpufreq_governor: performance
In addition to that, the commit also has significant impact on the following tests:
+------------------+----------------------------------------------------------------------------------------------------+
| testcase: change | vm-scalability: vm-scalability.throughput 3.9% improvement |
| test machine | 224 threads 4 sockets Intel(R) Xeon(R) Platinum 8380H CPU @ 2.90GHz (Cooper Lake) with 192G memory |
| test parameters | cpufreq_governor=performance |
| | runtime=300s |
| | size=8T |
| | test=anon-w-seq-mt |
+------------------+----------------------------------------------------------------------------------------------------+
| testcase: change | vm-scalability: vm-scalability.throughput 6.9% improvement |
| test machine | 224 threads 4 sockets Intel(R) Xeon(R) Platinum 8380H CPU @ 2.90GHz (Cooper Lake) with 192G memory |
| test parameters | cpufreq_governor=performance |
| | runtime=300s |
| | size=8T |
| | test=anon-w-seq |
+------------------+----------------------------------------------------------------------------------------------------+
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 <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202512221355.7a45e5d4-lkp@intel.com
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251222/202512221355.7a45e5d4-lkp@intel.com
=========================================================================================
compiler/cpufreq_governor/ipc/iterations/kconfig/mode/nr_threads/rootfs/tbox_group/testcase:
gcc-14/performance/pipe/4/x86_64-rhel-9.4/threads/100%/debian-13-x86_64-20250902.cgz/lkp-icl-2sp7/hackbench
commit:
08d473dd87 ("sched/fair: Small cleanup to update_newidle_cost()")
33cf66d883 ("sched/fair: Proportional newidle balance")
08d473dd8718e4a4 33cf66d88306663d16e4759e9d2
---------------- ---------------------------
%stddev %change %stddev
\ | \
2796734 ± 55% +32.9% 3716911 ± 45% numa-meminfo.node1.MemUsed
0.73 ± 3% +0.3 1.01 mpstat.cpu.all.irq%
13.17 -1.9 11.28 mpstat.cpu.all.usr%
3.00 +1083.3% 35.50 ± 31% mpstat.max_utilization.seconds
3999110 +10.1% 4402258 ± 2% vmstat.memory.cache
4477499 ± 2% +13.5% 5081114 vmstat.system.cs
326244 ± 2% +20.4% 392931 vmstat.system.in
57.83 ± 25% +7226.5% 4237 ± 24% perf-c2c.DRAM.local
49.17 ± 27% +19835.9% 9801 ± 37% perf-c2c.DRAM.remote
13.00 ± 24% +2.2e+05% 28779 ± 22% perf-c2c.HITM.local
7.67 ± 35% +89197.8% 6846 ± 34% perf-c2c.HITM.remote
20.67 ± 21% +1.7e+05% 35625 ± 22% perf-c2c.HITM.total
901800 ± 2% +45.2% 1309416 ± 9% meminfo.Active
901784 ± 2% +45.2% 1309400 ± 9% meminfo.Active(anon)
63230 +12.0% 70817 meminfo.AnonHugePages
3898764 +10.1% 4291919 ± 2% meminfo.Cached
1045421 ± 2% +39.3% 1456057 ± 8% meminfo.Committed_AS
248500 ± 3% +158.2% 641664 ± 17% meminfo.Shmem
8.14 ± 3% -51.4% 3.96 ± 45% perf-sched.sch_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
8.14 ± 3% -51.4% 3.96 ± 45% perf-sched.total_sch_delay.average.ms
22.81 ± 3% -48.8% 11.67 ± 43% perf-sched.total_wait_and_delay.average.ms
946434 ± 2% +88.9% 1788054 ± 18% perf-sched.total_wait_and_delay.count.ms
14.66 ± 3% -47.4% 7.72 ± 43% perf-sched.total_wait_time.average.ms
22.81 ± 3% -48.8% 11.67 ± 43% perf-sched.wait_and_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
946434 ± 2% +88.9% 1788054 ± 18% perf-sched.wait_and_delay.count.[unknown].[unknown].[unknown].[unknown].[unknown]
14.66 ± 3% -47.4% 7.72 ± 43% perf-sched.wait_time.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
0.13 ± 5% -0.0 0.10 ± 3% turbostat.C1%
4.68 -0.5 4.18 ± 3% turbostat.C6%
2.53 ± 2% -17.7% 2.08 ± 3% turbostat.CPU%c6
0.77 -10.9% 0.68 turbostat.IPC
17255476 ± 2% +43.7% 24791410 turbostat.IRQ
219.17 ± 33% +2e+05% 436508 ± 20% turbostat.NMI
273.53 -1.4% 269.67 turbostat.PkgWatt
14.54 +2.0% 14.83 turbostat.RAMWatt
630734 -17.8% 518722 hackbench.throughput
605546 -17.0% 502866 hackbench.throughput_avg
630734 -17.8% 518722 hackbench.throughput_best
572043 ± 2% -15.6% 482994 hackbench.throughput_worst
50.31 +20.3% 60.50 hackbench.time.elapsed_time
50.31 +20.3% 60.50 hackbench.time.elapsed_time.max
67764693 ± 2% +29.7% 87872106 hackbench.time.involuntary_context_switches
2687 +22.9% 3302 hackbench.time.system_time
413.13 +1.6% 419.62 hackbench.time.user_time
1.678e+08 ± 3% +37.9% 2.314e+08 hackbench.time.voluntary_context_switches
225128 ± 2% +45.8% 328204 ± 9% proc-vmstat.nr_active_anon
974391 +10.2% 1073782 ± 2% proc-vmstat.nr_file_pages
61824 ± 2% +160.8% 161217 ± 18% proc-vmstat.nr_shmem
23019 +1.8% 23427 proc-vmstat.nr_slab_reclaimable
225128 ± 2% +45.8% 328204 ± 9% proc-vmstat.nr_zone_active_anon
58402359 -6.7% 54511492 proc-vmstat.numa_hit
58336619 -6.7% 54440569 proc-vmstat.numa_local
58443581 -6.6% 54564213 proc-vmstat.pgalloc_normal
326135 ± 2% +7.6% 350981 ± 2% proc-vmstat.pgfault
58074498 -7.0% 54016525 proc-vmstat.pgfree
11225 ± 3% +8.3% 12156 ± 2% proc-vmstat.pgreuse
5.25 ± 42% -4.8 0.47 ±141% perf-profile.calltrace.cycles-pp.cmd_record.perf_c2c__record.run_builtin.handle_internal_command.main
5.25 ± 42% -4.8 0.47 ±141% perf-profile.calltrace.cycles-pp.perf_c2c__record.run_builtin.handle_internal_command.main
12.52 ± 20% -4.5 8.00 ± 18% perf-profile.calltrace.cycles-pp.handle_internal_command.main
12.52 ± 20% -4.5 8.00 ± 18% perf-profile.calltrace.cycles-pp.main
12.52 ± 20% -4.5 8.00 ± 18% perf-profile.calltrace.cycles-pp.run_builtin.handle_internal_command.main
5.25 ± 42% -4.8 0.47 ±141% perf-profile.children.cycles-pp.perf_c2c__record
12.52 ± 20% -4.5 8.00 ± 18% perf-profile.children.cycles-pp.handle_internal_command
12.52 ± 20% -4.5 8.00 ± 18% perf-profile.children.cycles-pp.main
12.52 ± 20% -4.5 8.00 ± 18% perf-profile.children.cycles-pp.run_builtin
9.18 ± 11% -2.2 6.94 ± 12% perf-profile.children.cycles-pp.perf_mmap__push
9.18 ± 11% -2.2 6.94 ± 12% perf-profile.children.cycles-pp.record__mmap_read_evlist
1.54 ± 31% -0.8 0.76 ± 72% perf-profile.children.cycles-pp.free_unref_folios
0.31 ± 6% +14.4% 0.35 ± 4% perf-stat.i.MPKI
3.574e+10 -11.6% 3.158e+10 perf-stat.i.branch-instructions
0.29 ± 3% +0.0 0.34 ± 2% perf-stat.i.branch-miss-rate%
87582769 ± 2% +11.6% 97733339 perf-stat.i.branch-misses
12.80 ± 2% +0.7 13.48 ± 3% perf-stat.i.cache-miss-rate%
29195325 ± 4% +21.0% 35312359 ± 2% perf-stat.i.cache-misses
2.274e+08 +20.1% 2.731e+08 perf-stat.i.cache-references
4600492 ± 2% +13.3% 5212966 perf-stat.i.context-switches
1.38 +9.0% 1.50 perf-stat.i.cpi
196117 ± 3% +12.9% 221481 perf-stat.i.cpu-migrations
8508 ± 4% -22.0% 6639 ± 3% perf-stat.i.cycles-between-cache-misses
1.474e+11 -10.9% 1.314e+11 perf-stat.i.instructions
0.77 -10.5% 0.69 perf-stat.i.ipc
74.81 ± 2% +13.6% 85.00 perf-stat.i.metric.K/sec
4599 -5.9% 4326 ± 3% perf-stat.i.minor-faults
4599 -5.9% 4326 ± 3% perf-stat.i.page-faults
0.20 ± 4% +35.5% 0.27 ± 2% perf-stat.overall.MPKI
0.24 ± 2% +0.1 0.31 perf-stat.overall.branch-miss-rate%
1.30 +12.5% 1.46 perf-stat.overall.cpi
6585 ± 4% -17.1% 5460 ± 2% perf-stat.overall.cycles-between-cache-misses
0.77 -11.1% 0.69 perf-stat.overall.ipc
3.51e+10 -11.3% 3.112e+10 perf-stat.ps.branch-instructions
85824759 ± 2% +12.1% 96172996 perf-stat.ps.branch-misses
28546162 ± 4% +21.2% 34607348 ± 2% perf-stat.ps.cache-misses
2.226e+08 +20.6% 2.685e+08 perf-stat.ps.cache-references
4503993 ± 2% +13.8% 5125779 perf-stat.ps.context-switches
190480 ± 3% +13.9% 216966 perf-stat.ps.cpu-migrations
1.448e+11 -10.6% 1.295e+11 perf-stat.ps.instructions
4448 ± 2% -5.7% 4194 ± 3% perf-stat.ps.minor-faults
4448 ± 2% -5.7% 4194 ± 3% perf-stat.ps.page-faults
7.434e+12 +7.3% 7.977e+12 perf-stat.total.instructions
4022 ± 11% +19005.0% 768561 sched_debug.cfs_rq:/.avg_vruntime.avg
63303 ± 20% +1634.0% 1097703 ± 8% sched_debug.cfs_rq:/.avg_vruntime.max
40.66 ± 55% +1.5e+06% 626513 ± 3% sched_debug.cfs_rq:/.avg_vruntime.min
10888 ± 12% +729.2% 90287 ± 7% sched_debug.cfs_rq:/.avg_vruntime.stddev
0.26 ± 19% +2662.0% 7.19 ± 10% sched_debug.cfs_rq:/.h_nr_queued.avg
1.17 ± 31% +1328.6% 16.67 ± 9% sched_debug.cfs_rq:/.h_nr_queued.max
0.44 ± 7% +736.6% 3.69 ± 6% sched_debug.cfs_rq:/.h_nr_queued.stddev
0.26 ± 17% +2683.2% 7.10 ± 10% sched_debug.cfs_rq:/.h_nr_runnable.avg
1.00 +1558.3% 16.58 ± 9% sched_debug.cfs_rq:/.h_nr_runnable.max
0.43 ± 5% +750.0% 3.68 ± 7% sched_debug.cfs_rq:/.h_nr_runnable.stddev
6.24 ±191% +3.3e+05% 20792 ± 60% sched_debug.cfs_rq:/.left_deadline.avg
285.31 ±179% +2.2e+05% 630356 ± 45% sched_debug.cfs_rq:/.left_deadline.max
38.45 ±182% +2.8e+05% 107740 ± 50% sched_debug.cfs_rq:/.left_deadline.stddev
5.13 ±209% +4.1e+05% 20792 ± 60% sched_debug.cfs_rq:/.left_vruntime.avg
250.71 ±205% +2.5e+05% 630327 ± 45% sched_debug.cfs_rq:/.left_vruntime.max
32.50 ±206% +3.3e+05% 107737 ± 50% sched_debug.cfs_rq:/.left_vruntime.stddev
8047 ± 91% +270.1% 29786 ± 25% sched_debug.cfs_rq:/.load.avg
2716 ±118% -64.0% 977.67 ± 25% sched_debug.cfs_rq:/.load_avg.max
443.38 ± 81% -50.2% 220.58 ± 13% sched_debug.cfs_rq:/.load_avg.stddev
0.26 ± 19% +142.9% 0.63 ± 2% sched_debug.cfs_rq:/.nr_queued.avg
0.44 ± 7% -35.7% 0.28 ± 12% sched_debug.cfs_rq:/.nr_queued.stddev
1023 -50.0% 512.00 sched_debug.cfs_rq:/.removed.load_avg.max
242.76 ± 12% -44.6% 134.43 ± 14% sched_debug.cfs_rq:/.removed.load_avg.stddev
521.00 ± 3% -56.5% 226.58 ± 18% sched_debug.cfs_rq:/.removed.runnable_avg.max
89.43 ± 17% -47.1% 47.29 ± 29% sched_debug.cfs_rq:/.removed.runnable_avg.stddev
521.00 ± 3% -56.5% 226.58 ± 18% sched_debug.cfs_rq:/.removed.util_avg.max
89.43 ± 17% -47.2% 47.24 ± 29% sched_debug.cfs_rq:/.removed.util_avg.stddev
5.13 ±209% +4.1e+05% 20792 ± 60% sched_debug.cfs_rq:/.right_vruntime.avg
250.71 ±205% +2.5e+05% 630327 ± 45% sched_debug.cfs_rq:/.right_vruntime.max
32.50 ±206% +3.3e+05% 107737 ± 50% sched_debug.cfs_rq:/.right_vruntime.stddev
419.09 ± 3% +1660.7% 7378 ± 10% sched_debug.cfs_rq:/.runnable_avg.avg
1116 ± 8% +1012.4% 12414 ± 15% sched_debug.cfs_rq:/.runnable_avg.max
311.46 ± 6% +537.6% 1985 ± 12% sched_debug.cfs_rq:/.runnable_avg.stddev
418.39 ± 3% +68.9% 706.65 sched_debug.cfs_rq:/.util_avg.avg
311.42 ± 6% -27.4% 226.04 ± 3% sched_debug.cfs_rq:/.util_avg.stddev
48.78 ± 28% +1188.5% 628.47 ± 11% sched_debug.cfs_rq:/.util_est.avg
1000 ± 2% +153.4% 2534 ± 22% sched_debug.cfs_rq:/.util_est.max
165.60 ± 14% +164.7% 438.41 ± 10% sched_debug.cfs_rq:/.util_est.stddev
3880 ± 11% +19675.4% 767426 sched_debug.cfs_rq:/.zero_vruntime.avg
60092 ± 22% +1721.9% 1094804 ± 8% sched_debug.cfs_rq:/.zero_vruntime.max
40.66 ± 55% +1.5e+06% 626014 ± 3% sched_debug.cfs_rq:/.zero_vruntime.min
10394 ± 12% +766.1% 90022 ± 7% sched_debug.cfs_rq:/.zero_vruntime.stddev
689417 -28.0% 496499 ± 2% sched_debug.cpu.avg_idle.avg
4781 ± 8% +748.8% 40585 ± 9% sched_debug.cpu.avg_idle.min
273724 ± 4% -19.6% 220005 ± 5% sched_debug.cpu.avg_idle.stddev
53241 +57.1% 83652 sched_debug.cpu.clock.avg
53245 +57.2% 83724 sched_debug.cpu.clock.max
53236 +57.0% 83559 sched_debug.cpu.clock.min
2.60 ± 7% +1636.3% 45.23 ± 28% sched_debug.cpu.clock.stddev
52950 +56.8% 83049 sched_debug.cpu.clock_task.avg
53211 +56.7% 83394 sched_debug.cpu.clock_task.max
44851 +66.7% 74757 sched_debug.cpu.clock_task.min
1218 ± 20% +622.9% 8810 sched_debug.cpu.curr->pid.avg
5793 +106.9% 11984 sched_debug.cpu.curr->pid.max
2286 ± 7% -23.5% 1748 ± 17% sched_debug.cpu.curr->pid.stddev
0.00 ± 54% +99.1% 0.00 ± 26% sched_debug.cpu.next_balance.stddev
0.24 ± 20% +2853.8% 7.15 ± 10% sched_debug.cpu.nr_running.avg
1.17 ± 31% +1328.6% 16.67 ± 9% sched_debug.cpu.nr_running.max
0.43 ± 8% +764.5% 3.72 ± 7% sched_debug.cpu.nr_running.stddev
2270 +1.1e+05% 2434691 sched_debug.cpu.nr_switches.avg
9778 ± 11% +27615.8% 2710239 sched_debug.cpu.nr_switches.max
279.33 ± 32% +7.9e+05% 2202298 ± 2% sched_debug.cpu.nr_switches.min
2058 ± 9% +4832.7% 101550 ± 10% sched_debug.cpu.nr_switches.stddev
12.33 ± 18% +200.0% 37.00 ± 13% sched_debug.cpu.nr_uninterruptible.max
-10.67 +249.2% -37.25 sched_debug.cpu.nr_uninterruptible.min
4.51 ± 13% +247.7% 15.68 ± 5% sched_debug.cpu.nr_uninterruptible.stddev
53236 +56.9% 83553 sched_debug.cpu_clk
52523 +57.7% 82840 sched_debug.ktime
53984 +56.2% 84309 sched_debug.sched_clk
32696319 +205.2% 99805183 sched_debug.sysctl_sched.sysctl_sched_features
***************************************************************************************************
lkp-cpl-4sp2: 224 threads 4 sockets Intel(R) Xeon(R) Platinum 8380H CPU @ 2.90GHz (Cooper Lake) with 192G memory
=========================================================================================
compiler/cpufreq_governor/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
gcc-14/performance/x86_64-rhel-9.4/debian-13-x86_64-20250902.cgz/300s/8T/lkp-cpl-4sp2/anon-w-seq-mt/vm-scalability
commit:
08d473dd87 ("sched/fair: Small cleanup to update_newidle_cost()")
33cf66d883 ("sched/fair: Proportional newidle balance")
08d473dd8718e4a4 33cf66d88306663d16e4759e9d2
---------------- ---------------------------
%stddev %change %stddev
\ | \
140169 ± 11% +20.4% 168807 ± 11% numa-meminfo.node0.Slab
38.84 +3.1 41.95 turbostat.C1%
35883 ± 16% -38.7% 22013 ± 12% sched_debug.cpu.max_idle_balance_cost.stddev
0.25 ± 33% -55.9% 0.11 ± 58% sched_debug.cpu.nr_uninterruptible.avg
-89.12 -21.9% -69.57 sched_debug.cpu.nr_uninterruptible.min
32696319 +205.2% 99805183 sched_debug.sysctl_sched.sysctl_sched_features
30.68 -0.4 30.28 perf-profile.calltrace.cycles-pp.do_rw_once
0.59 -0.0 0.56 perf-profile.calltrace.cycles-pp.asm_sysvec_apic_timer_interrupt.do_rw_once
0.07 ± 8% -0.0 0.02 ± 99% perf-profile.children.cycles-pp.schedule
0.08 ± 6% -0.0 0.05 perf-profile.children.cycles-pp.sched_balance_rq
0.08 ± 8% -0.0 0.06 ± 6% perf-profile.children.cycles-pp.__schedule
0.06 -0.0 0.05 perf-profile.self.cycles-pp.___perf_sw_event
0.05 +0.0 0.06 perf-profile.self.cycles-pp.mas_walk
0.08 ± 2% -10.1% 0.07 vm-scalability.free_time
348488 +1.7% 354569 vm-scalability.median
93790815 +3.9% 97486053 vm-scalability.throughput
383366 ± 5% +27.3% 487878 ± 2% vm-scalability.time.involuntary_context_switches
13116 -5.1% 12451 vm-scalability.time.percent_of_cpu_this_job_got
18386 -4.5% 17565 vm-scalability.time.system_time
21178 -5.2% 20069 vm-scalability.time.user_time
274218 -2.3% 267786 vm-scalability.time.voluntary_context_switches
8334443 -6.2% 7821786 proc-vmstat.nr_active_anon
8182472 -6.2% 7672252 proc-vmstat.nr_anon_pages
15772 -6.3% 14776 proc-vmstat.nr_anon_transparent_hugepages
3714681 +1.1% 3753946 proc-vmstat.nr_dirty_background_threshold
7438445 +1.1% 7517071 proc-vmstat.nr_dirty_threshold
37387239 +1.0% 37779422 proc-vmstat.nr_free_pages
37148190 +1.1% 37546282 proc-vmstat.nr_free_pages_blocks
17965 -5.9% 16898 proc-vmstat.nr_page_table_pages
8334431 -6.2% 7821774 proc-vmstat.nr_zone_active_anon
3.38 -2.0% 3.31 perf-stat.i.MPKI
6.728e+10 -2.0% 6.591e+10 perf-stat.i.branch-instructions
0.06 -0.0 0.06 ± 2% perf-stat.i.branch-miss-rate%
26644187 -11.1% 23698025 ± 2% perf-stat.i.branch-misses
66.58 -1.2 65.43 perf-stat.i.cache-miss-rate%
7.144e+08 -3.9% 6.868e+08 perf-stat.i.cache-misses
1.07e+09 -2.3% 1.045e+09 perf-stat.i.cache-references
8866 ± 2% +3.7% 9196 perf-stat.i.context-switches
2.51 -4.4% 2.40 perf-stat.i.cpi
5.33e+11 -6.2% 4.999e+11 perf-stat.i.cpu-cycles
665.04 -8.8% 606.57 perf-stat.i.cpu-migrations
743.32 -2.5% 724.57 perf-stat.i.cycles-between-cache-misses
2.109e+11 -2.1% 2.066e+11 perf-stat.i.instructions
0.40 +4.7% 0.42 perf-stat.i.ipc
3.39 -2.0% 3.33 perf-stat.overall.MPKI
0.03 -0.0 0.03 perf-stat.overall.branch-miss-rate%
66.92 -1.2 65.75 perf-stat.overall.cache-miss-rate%
2.53 -4.6% 2.42 perf-stat.overall.cpi
746.31 -2.6% 726.93 perf-stat.overall.cycles-between-cache-misses
0.39 +4.8% 0.41 perf-stat.overall.ipc
22267708 -8.1% 20466034 perf-stat.ps.branch-misses
6.891e+08 -2.4% 6.726e+08 perf-stat.ps.cache-misses
8639 +3.3% 8927 perf-stat.ps.context-switches
5.143e+11 -4.9% 4.889e+11 perf-stat.ps.cpu-cycles
624.80 -6.6% 583.36 perf-stat.ps.cpu-migrations
***************************************************************************************************
lkp-cpl-4sp2: 224 threads 4 sockets Intel(R) Xeon(R) Platinum 8380H CPU @ 2.90GHz (Cooper Lake) with 192G memory
=========================================================================================
compiler/cpufreq_governor/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
gcc-14/performance/x86_64-rhel-9.4/debian-13-x86_64-20250902.cgz/300s/8T/lkp-cpl-4sp2/anon-w-seq/vm-scalability
commit:
08d473dd87 ("sched/fair: Small cleanup to update_newidle_cost()")
33cf66d883 ("sched/fair: Proportional newidle balance")
08d473dd8718e4a4 33cf66d88306663d16e4759e9d2
---------------- ---------------------------
%stddev %change %stddev
\ | \
12868898 ± 8% -13.6% 11117210 ± 6% meminfo.DirectMap2M
22.51 ± 2% +5.1 27.56 mpstat.cpu.all.idle%
4570 ± 6% -8.2% 4195 ± 5% perf-c2c.DRAM.remote
32696319 +205.2% 99805183 sched_debug.sysctl_sched.sysctl_sched_features
25712 +13.8% 29272 uptime.idle
1.544e+10 ± 2% +22.7% 1.895e+10 cpuidle..time
16705139 ± 2% +21.5% 20304654 cpuidle..usage
9686016 ± 9% -11.2% 8601707 ± 10% numa-meminfo.node0.AnonHugePages
9810366 ± 9% -11.5% 8680271 ± 10% numa-meminfo.node0.AnonPages
2.08 ± 10% +38.9% 2.88 ± 14% perf-sched.sch_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
2.08 ± 10% +38.9% 2.88 ± 14% perf-sched.total_sch_delay.average.ms
22.68 ± 2% +5.2 27.82 turbostat.C1%
22.38 ± 2% +22.6% 27.43 turbostat.CPU%c1
5618917 -8.7% 5131336 ± 3% turbostat.NMI
847.70 -1.8% 832.15 turbostat.PkgWatt
43.20 -1.3% 42.66 turbostat.RAMWatt
0.01 -7.0% 0.01 vm-scalability.free_time
347285 +3.1% 358120 vm-scalability.median
2.87 ± 5% +0.5 3.42 ± 9% vm-scalability.median_stddev%
7.35 ± 6% +1.6 8.98 ± 6% vm-scalability.stddev%
82530869 +6.9% 88238114 vm-scalability.throughput
766040 ± 2% +6.1% 812920 vm-scalability.time.involuntary_context_switches
16652 -6.7% 15540 vm-scalability.time.percent_of_cpu_this_job_got
23121 -6.3% 21670 vm-scalability.time.system_time
27174 -7.0% 25266 vm-scalability.time.user_time
108375 +3.4% 112073 vm-scalability.time.voluntary_context_switches
9573443 -7.9% 8820226 proc-vmstat.nr_active_anon
9381538 -7.9% 8641925 proc-vmstat.nr_anon_pages
18112 -8.0% 16669 proc-vmstat.nr_anon_transparent_hugepages
3615325 +1.6% 3673671 proc-vmstat.nr_dirty_background_threshold
7239491 +1.6% 7356326 proc-vmstat.nr_dirty_threshold
36406902 +1.6% 36983177 proc-vmstat.nr_free_pages
36161545 +1.6% 36744053 proc-vmstat.nr_free_pages_blocks
18649 -5.6% 17609 proc-vmstat.nr_page_table_pages
145727 -4.0% 139928 ± 2% proc-vmstat.nr_shmem
9573428 -7.9% 8820214 proc-vmstat.nr_zone_active_anon
4676636 -12.0% 4113946 proc-vmstat.numa_huge_pte_updates
2.395e+09 -12.0% 2.106e+09 proc-vmstat.numa_pte_updates
3.69 -2.6% 3.59 perf-stat.i.MPKI
25933220 ± 2% -7.5% 23983956 perf-stat.i.branch-misses
72.64 -1.7 70.92 perf-stat.i.cache-miss-rate%
8.254e+08 -3.3% 7.985e+08 perf-stat.i.cache-misses
8791 +6.3% 9344 perf-stat.i.context-switches
3.00 -6.3% 2.81 perf-stat.i.cpi
6.733e+11 -7.0% 6.262e+11 perf-stat.i.cpu-cycles
812.82 -3.9% 781.10 perf-stat.i.cycles-between-cache-misses
0.34 +7.0% 0.36 perf-stat.i.ipc
3.70 -2.5% 3.61 perf-stat.overall.MPKI
0.03 -0.0 0.03 perf-stat.overall.branch-miss-rate%
72.83 -1.7 71.16 perf-stat.overall.cache-miss-rate%
3.01 -6.2% 2.83 perf-stat.overall.cpi
814.12 -3.8% 783.11 perf-stat.overall.cycles-between-cache-misses
0.33 +6.6% 0.35 perf-stat.overall.ipc
22052951 -7.8% 20340363 perf-stat.ps.branch-misses
7.949e+08 -2.8% 7.728e+08 perf-stat.ps.cache-misses
8696 +4.7% 9105 perf-stat.ps.context-switches
6.471e+11 -6.5% 6.052e+11 perf-stat.ps.cpu-cycles
569.36 +1.4% 577.21 perf-stat.ps.cpu-migrations
32.67 -0.9 31.80 perf-profile.calltrace.cycles-pp.do_rw_once
44.13 -0.4 43.74 perf-profile.calltrace.cycles-pp.asm_exc_page_fault.do_access
44.00 -0.4 43.62 perf-profile.calltrace.cycles-pp.exc_page_fault.asm_exc_page_fault.do_access
44.00 -0.4 43.62 perf-profile.calltrace.cycles-pp.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.do_access
43.80 -0.4 43.41 perf-profile.calltrace.cycles-pp.__handle_mm_fault.handle_mm_fault.do_user_addr_fault.exc_page_fault.asm_exc_page_fault
43.86 -0.4 43.48 perf-profile.calltrace.cycles-pp.handle_mm_fault.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.do_access
43.70 -0.4 43.32 perf-profile.calltrace.cycles-pp.__do_huge_pmd_anonymous_page.__handle_mm_fault.handle_mm_fault.do_user_addr_fault.exc_page_fault
43.13 -0.4 42.77 perf-profile.calltrace.cycles-pp.vma_alloc_anon_folio_pmd.__do_huge_pmd_anonymous_page.__handle_mm_fault.handle_mm_fault.do_user_addr_fault
39.61 -0.3 39.28 perf-profile.calltrace.cycles-pp.clear_page_erms.folio_zero_user.vma_alloc_anon_folio_pmd.__do_huge_pmd_anonymous_page.__handle_mm_fault
41.47 -0.3 41.16 perf-profile.calltrace.cycles-pp.folio_zero_user.vma_alloc_anon_folio_pmd.__do_huge_pmd_anonymous_page.__handle_mm_fault.handle_mm_fault
1.33 ± 21% +1.1 2.48 ± 17% perf-profile.calltrace.cycles-pp.cpuidle_enter_state.cpuidle_enter.cpuidle_idle_call.do_idle.cpu_startup_entry
1.34 ± 21% +1.1 2.48 ± 17% perf-profile.calltrace.cycles-pp.cpuidle_enter.cpuidle_idle_call.do_idle.cpu_startup_entry.start_secondary
1.33 ± 21% +1.1 2.48 ± 16% perf-profile.calltrace.cycles-pp.acpi_safe_halt.acpi_idle_do_entry.acpi_idle_enter.cpuidle_enter_state.cpuidle_enter
1.33 ± 21% +1.2 2.48 ± 17% perf-profile.calltrace.cycles-pp.acpi_idle_do_entry.acpi_idle_enter.cpuidle_enter_state.cpuidle_enter.cpuidle_idle_call
1.33 ± 21% +1.2 2.48 ± 17% perf-profile.calltrace.cycles-pp.acpi_idle_enter.cpuidle_enter_state.cpuidle_enter.cpuidle_idle_call.do_idle
1.36 ± 21% +1.2 2.52 ± 16% perf-profile.calltrace.cycles-pp.cpu_startup_entry.start_secondary.common_startup_64
1.36 ± 21% +1.2 2.52 ± 16% perf-profile.calltrace.cycles-pp.do_idle.cpu_startup_entry.start_secondary.common_startup_64
1.36 ± 21% +1.2 2.52 ± 16% perf-profile.calltrace.cycles-pp.start_secondary.common_startup_64
1.35 ± 21% +1.2 2.51 ± 16% perf-profile.calltrace.cycles-pp.cpuidle_idle_call.do_idle.cpu_startup_entry.start_secondary.common_startup_64
1.37 ± 21% +1.2 2.53 ± 16% perf-profile.calltrace.cycles-pp.common_startup_64
2.50 ± 21% +2.2 4.71 ± 16% perf-profile.calltrace.cycles-pp.asm_sysvec_apic_timer_interrupt.pv_native_safe_halt.acpi_safe_halt.acpi_idle_do_entry.acpi_idle_enter
42.55 -0.5 42.01 perf-profile.children.cycles-pp.do_rw_once
44.04 -0.4 43.65 perf-profile.children.cycles-pp.exc_page_fault
44.19 -0.4 43.80 perf-profile.children.cycles-pp.asm_exc_page_fault
44.04 -0.4 43.65 perf-profile.children.cycles-pp.do_user_addr_fault
43.89 -0.4 43.51 perf-profile.children.cycles-pp.handle_mm_fault
43.82 -0.4 43.44 perf-profile.children.cycles-pp.__handle_mm_fault
43.70 -0.4 43.32 perf-profile.children.cycles-pp.__do_huge_pmd_anonymous_page
43.13 -0.4 42.77 perf-profile.children.cycles-pp.vma_alloc_anon_folio_pmd
42.23 -0.3 41.88 perf-profile.children.cycles-pp.folio_zero_user
39.95 -0.3 39.62 perf-profile.children.cycles-pp.clear_page_erms
0.08 -0.0 0.07 perf-profile.children.cycles-pp.___perf_sw_event
0.45 ± 12% +0.1 0.54 ± 12% perf-profile.children.cycles-pp.drm_atomic_helper_commit
0.45 ± 11% +0.1 0.54 ± 12% perf-profile.children.cycles-pp.drm_atomic_commit
0.48 ± 11% +0.1 0.57 ± 13% perf-profile.children.cycles-pp.worker_thread
0.45 ± 11% +0.1 0.54 ± 13% perf-profile.children.cycles-pp.drm_atomic_helper_dirtyfb
0.45 ± 11% +0.1 0.54 ± 13% perf-profile.children.cycles-pp.drm_fb_helper_damage_work
0.45 ± 11% +0.1 0.54 ± 13% perf-profile.children.cycles-pp.drm_fbdev_shmem_helper_fb_dirty
0.47 ± 11% +0.1 0.56 ± 12% perf-profile.children.cycles-pp.process_one_work
3.27 ± 9% +1.1 4.34 ± 9% perf-profile.children.cycles-pp.asm_sysvec_apic_timer_interrupt
1.34 ± 21% +1.2 2.49 ± 17% perf-profile.children.cycles-pp.acpi_safe_halt
1.34 ± 21% +1.2 2.49 ± 17% perf-profile.children.cycles-pp.pv_native_safe_halt
1.34 ± 21% +1.2 2.49 ± 17% perf-profile.children.cycles-pp.acpi_idle_do_entry
1.34 ± 21% +1.2 2.49 ± 17% perf-profile.children.cycles-pp.acpi_idle_enter
1.34 ± 21% +1.2 2.50 ± 16% perf-profile.children.cycles-pp.cpuidle_enter
1.34 ± 21% +1.2 2.50 ± 16% perf-profile.children.cycles-pp.cpuidle_enter_state
1.36 ± 21% +1.2 2.52 ± 16% perf-profile.children.cycles-pp.start_secondary
1.36 ± 21% +1.2 2.52 ± 16% perf-profile.children.cycles-pp.cpuidle_idle_call
1.37 ± 21% +1.2 2.53 ± 16% perf-profile.children.cycles-pp.common_startup_64
1.37 ± 21% +1.2 2.53 ± 16% perf-profile.children.cycles-pp.cpu_startup_entry
1.37 ± 21% +1.2 2.53 ± 16% perf-profile.children.cycles-pp.do_idle
40.98 -0.6 40.37 perf-profile.self.cycles-pp.do_rw_once
39.02 -0.3 38.71 perf-profile.self.cycles-pp.clear_page_erms
0.99 -0.0 0.94 perf-profile.self.cycles-pp.folio_zero_user
0.44 ± 12% +0.1 0.53 ± 12% perf-profile.self.cycles-pp.memcpy_toio
1.24 ± 21% +1.1 2.34 ± 16% perf-profile.self.cycles-pp.pv_native_safe_halt
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
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