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Message-ID: <202506121329.9d1f4d50-lkp@intel.com>
Date: Thu, 12 Jun 2025 14:26:09 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Filipe Manana <fdmanana@...e.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
David Sterba <dsterba@...e.com>, <linux-btrfs@...r.kernel.org>,
<oliver.sang@...el.com>
Subject: [linus:master] [btrfs] 32c523c578: reaim.jobs_per_min 16.1%
regression
Hello,
kernel test robot noticed a 16.1% regression of reaim.jobs_per_min on:
commit: 32c523c578e8489f55663ce8a8860079c8deb414 ("btrfs: allow folios to be released while ordered extent is finishing")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
[still regression on linus/master 5abc7438f1e9d62e91ad775cc83c9594c48d2282]
[still regression on linux-next/master 911483b25612c8bc32a706ba940738cc43299496]
testcase: reaim
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:
runtime: 300s
nr_task: 100%
disk: 1HDD
fs: btrfs
test: disk
cpufreq_governor: performance
In addition to that, the commit also has significant impact on the following tests:
+------------------+-------------------------------------------------------------------------------------------+
| testcase: change | reaim: reaim.jobs_per_min 5.3% regression |
| test machine | 8 threads 1 sockets Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz (Ivy Bridge) with 16G memory |
| test parameters | cpufreq_governor=performance |
| | disk=1HDD |
| | fs=btrfs |
| | nr_task=100% |
| | runtime=300s |
| | test=disk |
+------------------+-------------------------------------------------------------------------------------------+
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/202506121329.9d1f4d50-lkp@intel.com
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250612/202506121329.9d1f4d50-lkp@intel.com
=========================================================================================
compiler/cpufreq_governor/disk/fs/kconfig/nr_task/rootfs/runtime/tbox_group/test/testcase:
gcc-12/performance/1HDD/btrfs/x86_64-rhel-9.4/100%/debian-12-x86_64-20240206.cgz/300s/lkp-icl-2sp7/disk/reaim
commit:
cbfb4cbf45 ("btrfs: update comment for try_release_extent_state()")
32c523c578 ("btrfs: allow folios to be released while ordered extent is finishing")
cbfb4cbf459d9be4 32c523c578e8489f55663ce8a88
---------------- ---------------------------
%stddev %change %stddev
\ | \
71009 -14.7% 60593 meminfo.Shmem
2.344e+10 -10.8% 2.09e+10 cpuidle..time
6491212 -20.8% 5141230 cpuidle..usage
93.14 -1.5% 91.75 iostat.cpu.idle
5.81 +24.8% 7.24 iostat.cpu.iowait
419.83 -9.5% 380.03 uptime.boot
24988 -10.7% 22325 uptime.idle
584.67 ± 3% -23.6% 446.83 ± 5% perf-c2c.DRAM.remote
551.00 ± 10% -19.1% 445.50 ± 9% perf-c2c.HITM.local
407.83 ± 5% -25.4% 304.17 ± 6% perf-c2c.HITM.remote
5.84 +1.5 7.29 mpstat.cpu.all.iowait%
0.09 -0.0 0.07 mpstat.cpu.all.irq%
0.53 -0.1 0.46 mpstat.cpu.all.sys%
0.36 ± 2% +0.0 0.40 ± 4% mpstat.cpu.all.usr%
2110659 ± 3% -22.4% 1638521 ± 3% numa-numastat.node0.local_node
2132066 ± 3% -21.5% 1673684 ± 3% numa-numastat.node0.numa_hit
2054843 ± 4% -16.8% 1709588 ± 2% numa-numastat.node1.local_node
2099801 ± 3% -17.1% 1740752 ± 2% numa-numastat.node1.numa_hit
61.66 +186.4% 176.60 vmstat.io.bi
17553 -16.2% 14712 vmstat.io.bo
3.91 ± 3% +25.7% 4.92 ± 4% vmstat.procs.b
9668 -12.3% 8476 vmstat.system.cs
13868 -10.9% 12357 vmstat.system.in
521965 ± 4% -27.8% 376885 ± 2% numa-vmstat.node0.nr_dirtied
500007 ± 4% -27.9% 360465 ± 2% numa-vmstat.node0.nr_written
2131472 ± 3% -21.5% 1673240 ± 3% numa-vmstat.node0.numa_hit
2110065 ± 3% -22.4% 1638077 ± 3% numa-vmstat.node0.numa_local
423228 ± 4% -21.9% 330636 ± 4% numa-vmstat.node1.nr_dirtied
405391 ± 4% -21.9% 316667 ± 4% numa-vmstat.node1.nr_written
2099495 ± 4% -17.1% 1739892 ± 2% numa-vmstat.node1.numa_hit
2054537 ± 4% -16.8% 1708728 ± 2% numa-vmstat.node1.numa_local
4262 -16.1% 3575 reaim.jobs_per_min
66.61 -16.1% 55.87 reaim.jobs_per_min_child
4305 -15.6% 3635 reaim.max_jobs_per_min
90.09 +19.2% 107.42 reaim.parent_time
1.07 ± 4% -15.8% 0.90 ± 3% reaim.std_dev_percent
369.06 -10.9% 328.84 reaim.time.elapsed_time
369.06 -10.9% 328.84 reaim.time.elapsed_time.max
45840 +155.6% 117178 reaim.time.file_system_inputs
5943434 -25.9% 4401353 reaim.time.file_system_outputs
18556 -29.3% 13119 reaim.time.involuntary_context_switches
3738859 -25.0% 2804459 reaim.time.minor_page_faults
28.83 -16.8% 24.00 reaim.time.percent_of_cpu_this_job_got
93.94 -24.8% 70.62 reaim.time.system_time
1061461 -24.9% 797506 reaim.time.voluntary_context_switches
25600 -25.0% 19200 reaim.workload
187046 -1.3% 184574 proc-vmstat.nr_active_anon
945195 -25.1% 707517 proc-vmstat.nr_dirtied
1133127 -1.6% 1115274 proc-vmstat.nr_file_pages
214899 -7.1% 199637 proc-vmstat.nr_inactive_file
17745 -14.7% 15145 proc-vmstat.nr_shmem
905398 -25.2% 677133 proc-vmstat.nr_written
187046 -1.3% 184574 proc-vmstat.nr_zone_active_anon
214899 -7.1% 199637 proc-vmstat.nr_zone_inactive_file
4233781 -19.3% 3415500 proc-vmstat.numa_hit
4167415 -19.6% 3349180 proc-vmstat.numa_local
4401990 -19.1% 3559895 proc-vmstat.pgalloc_normal
4837041 -21.2% 3813117 proc-vmstat.pgfault
4058646 -20.7% 3220351 proc-vmstat.pgfree
22920 +155.6% 58589 proc-vmstat.pgpgin
6526981 -25.2% 4881946 proc-vmstat.pgpgout
48196 -8.6% 44072 ± 3% proc-vmstat.pgreuse
2.95 +0.1 3.06 perf-stat.i.branch-miss-rate%
9010149 +3.5% 9323057 perf-stat.i.branch-misses
15272312 -6.6% 14260618 perf-stat.i.cache-references
9701 -12.3% 8509 perf-stat.i.context-switches
1.97 -1.7% 1.94 perf-stat.i.cpi
2.028e+09 -3.4% 1.958e+09 perf-stat.i.cpu-cycles
345.48 -12.7% 301.68 perf-stat.i.cpu-migrations
1061 +2.2% 1083 perf-stat.i.cycles-between-cache-misses
0.53 +2.0% 0.54 perf-stat.i.ipc
3.86 ± 2% -20.1% 3.09 ± 3% perf-stat.i.major-faults
12520 -11.9% 11027 perf-stat.i.minor-faults
12524 -11.9% 11030 perf-stat.i.page-faults
3.66 +0.1 3.81 perf-stat.overall.branch-miss-rate%
16.24 ± 5% +1.2 17.46 ± 6% perf-stat.overall.cache-miss-rate%
1.64 -3.2% 1.59 perf-stat.overall.cpi
0.61 +3.3% 0.63 perf-stat.overall.ipc
17792434 +18.5% 21081619 perf-stat.overall.path-length
8979944 +3.5% 9292382 perf-stat.ps.branch-misses
15229067 -6.6% 14216663 perf-stat.ps.cache-references
9674 -12.3% 8483 perf-stat.ps.context-switches
2.022e+09 -3.5% 1.953e+09 perf-stat.ps.cpu-cycles
344.62 -12.7% 300.82 perf-stat.ps.cpu-migrations
3.85 ± 2% -20.2% 3.08 ± 4% perf-stat.ps.major-faults
12486 -12.0% 10993 perf-stat.ps.minor-faults
12490 -12.0% 10996 perf-stat.ps.page-faults
4.555e+11 -11.1% 4.048e+11 perf-stat.total.instructions
24864 ± 2% -18.6% 20241 ± 6% sched_debug.cfs_rq:/.avg_vruntime.avg
9646 ± 3% -32.1% 6545 ± 11% sched_debug.cfs_rq:/.avg_vruntime.min
88.62 ± 7% +17.8% 104.42 ± 6% sched_debug.cfs_rq:/.load_avg.avg
165.70 ± 8% +21.4% 201.23 ± 6% sched_debug.cfs_rq:/.load_avg.stddev
24864 ± 2% -18.6% 20241 ± 6% sched_debug.cfs_rq:/.min_vruntime.avg
9646 ± 3% -32.1% 6545 ± 11% sched_debug.cfs_rq:/.min_vruntime.min
7.59 ± 18% +40.4% 10.66 ± 7% sched_debug.cfs_rq:/.util_est.avg
197.81 ± 13% +32.3% 261.71 ± 17% sched_debug.cfs_rq:/.util_est.max
31.28 ± 12% +30.3% 40.77 ± 10% sched_debug.cfs_rq:/.util_est.stddev
229863 -17.2% 190282 ± 7% sched_debug.cpu.clock.avg
229868 -17.2% 190287 ± 7% sched_debug.cpu.clock.max
229857 -17.2% 190276 ± 7% sched_debug.cpu.clock.min
229303 -17.2% 189808 ± 7% sched_debug.cpu.clock_task.avg
229667 -17.2% 190143 ± 7% sched_debug.cpu.clock_task.max
219476 -17.8% 180349 ± 7% sched_debug.cpu.clock_task.min
749.88 ± 29% -28.8% 533.95 ± 14% sched_debug.cpu.curr->pid.avg
32645 -29.7% 22956 ± 8% sched_debug.cpu.curr->pid.max
4481 ± 10% -29.9% 3143 ± 10% sched_debug.cpu.curr->pid.stddev
29063 -30.0% 20341 ± 9% sched_debug.cpu.nr_switches.avg
83586 ± 2% -29.8% 58716 ± 7% sched_debug.cpu.nr_switches.max
22149 ± 2% -33.0% 14831 ± 11% sched_debug.cpu.nr_switches.min
7977 ± 2% -25.6% 5937 ± 5% sched_debug.cpu.nr_switches.stddev
92.43 ± 28% -47.8% 48.21 ± 10% sched_debug.cpu.nr_uninterruptible.max
25.24 ± 8% -26.2% 18.62 ± 9% sched_debug.cpu.nr_uninterruptible.stddev
229859 -17.2% 190278 ± 7% sched_debug.cpu_clk
229148 -17.3% 189567 ± 7% sched_debug.ktime
230484 -17.2% 190908 ± 7% sched_debug.sched_clk
0.00 ±136% +392.6% 0.02 ± 80% perf-sched.sch_delay.avg.ms.__cond_resched.dput.terminate_walk.path_openat.do_filp_open
0.03 ±114% -56.9% 0.01 ± 5% perf-sched.sch_delay.avg.ms.schedule_preempt_disabled.rwsem_down_read_slowpath.down_read.btrfs_tree_read_lock_nested
0.25 ±209% -95.1% 0.01 ± 13% perf-sched.sch_delay.avg.ms.schedule_preempt_disabled.rwsem_down_write_slowpath.down_write.open_last_lookups
0.21 ± 40% -38.8% 0.13 ± 11% perf-sched.sch_delay.max.ms.wait_current_trans.start_transaction.btrfs_attach_transaction_barrier.btrfs_sync_fs
0.07 ± 42% +126.0% 0.16 ± 72% perf-sched.sch_delay.max.ms.wait_extent_bit.__lock_extent.lock_extents_for_read.constprop.0
26708 ± 2% -9.5% 24158 ± 3% perf-sched.total_wait_and_delay.count.ms
3.20 ± 9% +25.5% 4.02 ± 11% perf-sched.wait_and_delay.avg.ms.btrfs_commit_transaction.iterate_supers.ksys_sync.__x64_sys_sync
7.26 ± 15% +50.7% 10.94 ± 19% perf-sched.wait_and_delay.avg.ms.btrfs_start_ordered_extent_nowriteback.btrfs_run_ordered_extent_work.btrfs_work_helper.process_one_work
19.16 ± 29% -65.5% 6.61 ±142% perf-sched.wait_and_delay.avg.ms.schedule_preempt_disabled.__mutex_lock.constprop.0.btrfs_wait_ordered_roots
0.02 ± 59% +188.1% 0.05 ± 63% perf-sched.wait_and_delay.avg.ms.schedule_preempt_disabled.rwsem_down_write_slowpath.down_write.sync_inodes_sb
15.73 ± 19% +50.8% 23.72 ± 10% perf-sched.wait_and_delay.avg.ms.schedule_timeout.__wait_for_common.wait_for_completion_state.kernel_clone
256.17 ± 15% +34.5% 344.47 ± 13% perf-sched.wait_and_delay.avg.ms.wait_current_trans.start_transaction.btrfs_create_common.lookup_open.isra
78.54 ± 8% +18.1% 92.78 ± 11% perf-sched.wait_and_delay.avg.ms.wait_for_commit.btrfs_commit_transaction.iterate_supers.ksys_sync
67.31 ± 3% +12.5% 75.72 ± 5% perf-sched.wait_and_delay.avg.ms.wait_for_commit.btrfs_wait_for_commit.btrfs_attach_transaction_barrier.btrfs_sync_fs
805.00 ± 11% -21.9% 629.00 ± 11% perf-sched.wait_and_delay.count.btrfs_commit_transaction.iterate_supers.ksys_sync.__x64_sys_sync
833.33 ± 5% -29.6% 586.50 ± 13% perf-sched.wait_and_delay.count.btrfs_start_ordered_extent_nowriteback.btrfs_run_ordered_extent_work.btrfs_work_helper.process_one_work
2990 ± 5% -16.5% 2498 ± 3% perf-sched.wait_and_delay.count.io_schedule.folio_wait_bit_common.folio_wait_writeback.__filemap_fdatawait_range
151.17 ± 6% -70.6% 44.50 ±141% perf-sched.wait_and_delay.count.schedule_preempt_disabled.__mutex_lock.constprop.0.btrfs_wait_ordered_roots
553.50 ± 5% -26.3% 407.67 ± 9% perf-sched.wait_and_delay.count.schedule_timeout.__wait_for_common.btrfs_wait_ordered_extents.btrfs_wait_ordered_roots
618.50 ± 9% -25.4% 461.17 ± 12% perf-sched.wait_and_delay.count.wait_current_trans.start_transaction.btrfs_sync_file.btrfs_do_write_iter
955.00 ± 8% -27.5% 692.17 ± 8% perf-sched.wait_and_delay.count.wait_log_commit.btrfs_sync_log.btrfs_sync_file.btrfs_do_write_iter
551.40 ± 10% +33.8% 737.66 ± 8% perf-sched.wait_and_delay.max.ms.io_schedule.folio_wait_bit_common.folio_wait_writeback.__filemap_fdatawait_range
251.59 ± 18% +74.5% 438.99 ± 14% perf-sched.wait_and_delay.max.ms.wait_current_trans.start_transaction.btrfs_attach_transaction_barrier.btrfs_sync_fs
11.70 ± 99% -100.0% 0.00 ±223% perf-sched.wait_time.avg.ms.__cond_resched.btree_write_cache_pages.do_writepages.filemap_fdatawrite_wbc.__filemap_fdatawrite_range
44.61 ±189% +762.7% 384.84 ± 81% perf-sched.wait_time.avg.ms.__cond_resched.down_write.unlink_anon_vmas.free_pgtables.exit_mmap
3.19 ± 9% +25.6% 4.00 ± 11% perf-sched.wait_time.avg.ms.btrfs_commit_transaction.iterate_supers.ksys_sync.__x64_sys_sync
7.24 ± 15% +50.9% 10.93 ± 19% perf-sched.wait_time.avg.ms.btrfs_start_ordered_extent_nowriteback.btrfs_run_ordered_extent_work.btrfs_work_helper.process_one_work
1.69 ± 79% +178.9% 4.71 ± 62% perf-sched.wait_time.avg.ms.io_schedule.folio_wait_bit_common.extent_write_cache_pages.btrfs_writepages
15.72 ± 19% +50.9% 23.71 ± 10% perf-sched.wait_time.avg.ms.schedule_timeout.__wait_for_common.wait_for_completion_state.kernel_clone
20.99 ± 2% +38.2% 29.02 ± 15% perf-sched.wait_time.avg.ms.schedule_timeout.btrfs_sync_log.btrfs_sync_file.btrfs_do_write_iter
12.97 ± 13% +49.0% 19.32 ± 16% perf-sched.wait_time.avg.ms.schedule_timeout.io_schedule_timeout.__wait_for_common.barrier_all_devices
256.15 ± 15% +34.5% 344.45 ± 13% perf-sched.wait_time.avg.ms.wait_current_trans.start_transaction.btrfs_create_common.lookup_open.isra
10.94 ± 25% +84.6% 20.19 ± 24% perf-sched.wait_time.avg.ms.wait_extent_bit.__lock_extent.lock_and_cleanup_extent_if_need.copy_one_range
78.51 ± 8% +18.1% 92.75 ± 11% perf-sched.wait_time.avg.ms.wait_for_commit.btrfs_commit_transaction.iterate_supers.ksys_sync
67.26 ± 3% +12.5% 75.66 ± 5% perf-sched.wait_time.avg.ms.wait_for_commit.btrfs_wait_for_commit.btrfs_attach_transaction_barrier.btrfs_sync_fs
19.50 ±128% -100.0% 0.00 ±223% perf-sched.wait_time.max.ms.__cond_resched.btree_write_cache_pages.do_writepages.filemap_fdatawrite_wbc.__filemap_fdatawrite_range
83.75 ±187% +516.6% 516.38 ± 68% perf-sched.wait_time.max.ms.__cond_resched.down_write.unlink_anon_vmas.free_pgtables.exit_mmap
551.39 ± 10% +33.8% 737.64 ± 8% perf-sched.wait_time.max.ms.io_schedule.folio_wait_bit_common.folio_wait_writeback.__filemap_fdatawait_range
251.57 ± 18% +74.5% 438.95 ± 14% perf-sched.wait_time.max.ms.wait_current_trans.start_transaction.btrfs_attach_transaction_barrier.btrfs_sync_fs
86.74 ± 14% -27.4% 62.97 ± 11% perf-sched.wait_time.max.ms.wait_extent_bit.__lock_extent.lock_and_cleanup_extent_if_need.copy_one_range
***************************************************************************************************
lkp-ivb-d01: 8 threads 1 sockets Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz (Ivy Bridge) with 16G memory
=========================================================================================
compiler/cpufreq_governor/disk/fs/kconfig/nr_task/rootfs/runtime/tbox_group/test/testcase:
gcc-12/performance/1HDD/btrfs/x86_64-rhel-9.4/100%/debian-12-x86_64-20240206.cgz/300s/lkp-ivb-d01/disk/reaim
commit:
cbfb4cbf45 ("btrfs: update comment for try_release_extent_state()")
32c523c578 ("btrfs: allow folios to be released while ordered extent is finishing")
cbfb4cbf459d9be4 32c523c578e8489f55663ce8a88
---------------- ---------------------------
%stddev %change %stddev
\ | \
22777 +101.6% 45913 ± 13% proc-vmstat.pgpgin
12134 ± 4% +18.9% 14426 ± 7% sched_debug.cpu.nr_switches.stddev
80.30 -1.8% 78.89 iostat.cpu.idle
17.77 +8.1% 19.21 iostat.cpu.iowait
54.02 +101.9% 109.06 vmstat.io.bi
4061 -5.0% 3856 vmstat.io.bo
2.60 +2.2% 2.65 reaim.child_systime
348.91 -5.3% 330.27 reaim.jobs_per_min
43.61 -5.3% 41.28 reaim.jobs_per_min_child
356.27 -5.4% 336.88 reaim.max_jobs_per_min
137.64 +5.6% 145.41 reaim.parent_time
45554 +101.6% 91826 ± 13% reaim.time.file_system_inputs
0.17 ± 25% -0.1 0.09 ± 31% perf-profile.children.cycles-pp.select_task_rq_fair
0.16 ± 29% -0.1 0.10 ± 33% perf-profile.children.cycles-pp.vfs_fstatat
0.21 ± 16% -0.1 0.15 ± 12% perf-profile.children.cycles-pp.___perf_sw_event
0.06 ± 79% +0.1 0.16 ± 33% perf-profile.children.cycles-pp.vms_complete_munmap_vmas
0.07 ± 72% +0.1 0.18 ± 16% perf-profile.children.cycles-pp.vms_clear_ptes
0.19 ± 18% -0.1 0.12 ± 19% perf-profile.self.cycles-pp.___perf_sw_event
0.15 ± 30% +0.1 0.23 ± 33% perf-profile.self.cycles-pp.x86_pmu_disable
0.04 ± 9% +21.8% 0.05 ± 11% perf-sched.sch_delay.avg.ms.__cond_resched.__wait_for_common.barrier_all_devices.write_all_supers.btrfs_sync_log
0.05 ± 4% +18.7% 0.06 ± 4% perf-sched.sch_delay.avg.ms.io_schedule.folio_wait_bit_common.write_all_supers.btrfs_sync_log
0.04 ± 69% -100.0% 0.00 perf-sched.sch_delay.avg.ms.wait_extent_bit.__lock_extent.lock_and_cleanup_extent_if_need.copy_one_range
0.05 ± 69% -100.0% 0.00 perf-sched.sch_delay.max.ms.wait_extent_bit.__lock_extent.lock_and_cleanup_extent_if_need.copy_one_range
19.30 ± 9% +17.0% 22.59 ± 6% perf-sched.wait_and_delay.avg.ms.io_schedule.folio_wait_bit_common.write_all_supers.btrfs_sync_log
19.25 ± 9% +17.0% 22.53 ± 6% perf-sched.wait_time.avg.ms.io_schedule.folio_wait_bit_common.write_all_supers.btrfs_sync_log
15.74 ±107% -100.0% 0.00 perf-sched.wait_time.avg.ms.wait_extent_bit.__lock_extent.lock_and_cleanup_extent_if_need.copy_one_range
22.16 ± 79% -100.0% 0.00 perf-sched.wait_time.max.ms.wait_extent_bit.__lock_extent.lock_and_cleanup_extent_if_need.copy_one_range
4.44 +1.9% 4.53 perf-stat.i.MPKI
8.16 +0.2 8.41 perf-stat.i.branch-miss-rate%
2313 +1.6% 2350 perf-stat.i.context-switches
2.25 +1.9% 2.29 perf-stat.i.cpi
73.48 ± 3% -6.6% 68.61 perf-stat.i.cpu-migrations
1972 -2.1% 1931 perf-stat.i.minor-faults
1972 -2.1% 1931 perf-stat.i.page-faults
2308 +1.6% 2344 perf-stat.ps.context-switches
73.31 ± 3% -6.6% 68.45 perf-stat.ps.cpu-migrations
1967 -2.1% 1926 perf-stat.ps.minor-faults
1968 -2.1% 1926 perf-stat.ps.page-faults
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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