2021-08-04 18:33:27

by kernel test robot

[permalink] [raw]
Subject: [xfs] 2bf1ec0ff0: stress-ng.mknod.ops_per_sec -45.4% regression



Greeting,

FYI, we noticed a -45.4% regression of stress-ng.mknod.ops_per_sec due to commit:


commit: 2bf1ec0ff067ff8f692d261b29c713f3583f7e2a ("xfs: log forces imply data device cache flushes")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master


in testcase: stress-ng
on test machine: 96 threads 2 sockets Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz with 512G memory
with following parameters:

nr_threads: 10%
disk: 1HDD
testtime: 60s
fs: xfs
class: filesystem
test: mknod
cpufreq_governor: performance
ucode: 0x5003006




If you fix the issue, kindly add following tag
Reported-by: kernel test robot <[email protected]>


Details are as below:
-------------------------------------------------------------------------------------------------->


To reproduce:

git clone https://github.com/intel/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run
bin/lkp run generated-yaml-file

=========================================================================================
class/compiler/cpufreq_governor/disk/fs/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime/ucode:
filesystem/gcc-9/performance/1HDD/xfs/x86_64-rhel-8.3/10%/debian-10.4-x86_64-20200603.cgz/lkp-csl-2sp7/mknod/stress-ng/60s/0x5003006

commit:
45eddb4140 ("xfs: factor out forced iclog flushes")
2bf1ec0ff0 ("xfs: log forces imply data device cache flushes")

45eddb414047c366 2bf1ec0ff067ff8f692d261b29c
---------------- ---------------------------
%stddev %change %stddev
\ | \
87135 -45.4% 47612 stress-ng.mknod.ops
1451 -45.4% 793.24 stress-ng.mknod.ops_per_sec
23.00 ? 7% -51.4% 11.17 ? 12% stress-ng.time.percent_of_cpu_this_job_got
13.80 ? 7% -50.7% 6.80 ? 8% stress-ng.time.system_time
211458 ? 2% -62.4% 79605 ? 14% stress-ng.time.voluntary_context_switches
0.30 ? 2% -0.1 0.18 mpstat.cpu.all.sys%
13993 ? 2% -38.1% 8659 softirqs.BLOCK
27747 -2.3% 27103 proc-vmstat.nr_slab_reclaimable
76223 ? 3% -57.3% 32548 ? 5% proc-vmstat.pgpgout
1170 ? 3% -57.3% 500.17 ? 5% vmstat.io.bo
10752 -47.7% 5624 ? 6% vmstat.system.cs
32820 -34.5% 21499 slabinfo.kmalloc-rcl-64.active_objs
512.67 -34.6% 335.50 slabinfo.kmalloc-rcl-64.active_slabs
32836 -34.5% 21508 slabinfo.kmalloc-rcl-64.num_objs
512.67 -34.6% 335.50 slabinfo.kmalloc-rcl-64.num_slabs
24913 ? 2% -42.8% 14251 interrupts.315:PCI-MSI.376832-edge.ahci[0000:00:17.0]
71844 ? 6% -19.9% 57564 ? 3% interrupts.CAL:Function_call_interrupts
206.50 ? 37% -42.9% 118.00 ? 41% interrupts.CPU1.NMI:Non-maskable_interrupts
206.50 ? 37% -42.9% 118.00 ? 41% interrupts.CPU1.PMI:Performance_monitoring_interrupts
173.17 ? 26% -31.7% 118.33 ? 38% interrupts.CPU2.NMI:Non-maskable_interrupts
173.17 ? 26% -31.7% 118.33 ? 38% interrupts.CPU2.PMI:Performance_monitoring_interrupts
189.83 ? 34% -40.6% 112.83 ? 25% interrupts.CPU49.NMI:Non-maskable_interrupts
189.83 ? 34% -40.6% 112.83 ? 25% interrupts.CPU49.PMI:Performance_monitoring_interrupts
181.67 ? 25% -38.3% 112.17 ? 24% interrupts.CPU50.NMI:Non-maskable_interrupts
181.67 ? 25% -38.3% 112.17 ? 24% interrupts.CPU50.PMI:Performance_monitoring_interrupts
1895 ? 16% -32.8% 1274 ? 20% interrupts.RES:Rescheduling_interrupts
3.127e+08 ? 5% -12.2% 2.746e+08 ? 3% perf-stat.i.branch-instructions
10683 -49.8% 5364 ? 6% perf-stat.i.context-switches
3.866e+08 ? 4% -14.2% 3.318e+08 ? 3% perf-stat.i.dTLB-loads
1.949e+08 ? 3% -14.7% 1.662e+08 ? 3% perf-stat.i.dTLB-stores
1.538e+09 ? 5% -12.4% 1.348e+09 ? 3% perf-stat.i.instructions
9.31 ? 4% -13.6% 8.04 ? 3% perf-stat.i.metric.M/sec
127426 ? 14% -32.6% 85864 ? 9% perf-stat.i.node-load-misses
3.078e+08 ? 5% -12.2% 2.702e+08 ? 3% perf-stat.ps.branch-instructions
10512 -49.8% 5279 ? 6% perf-stat.ps.context-switches
3.805e+08 ? 4% -14.2% 3.265e+08 ? 3% perf-stat.ps.dTLB-loads
1.918e+08 ? 3% -14.7% 1.635e+08 ? 3% perf-stat.ps.dTLB-stores
1.514e+09 ? 5% -12.4% 1.327e+09 ? 3% perf-stat.ps.instructions
125399 ? 14% -32.6% 84480 ? 9% perf-stat.ps.node-load-misses
9.563e+10 ? 6% -12.3% 8.383e+10 ? 3% perf-stat.total.instructions
8.31 ? 20% -3.9 4.45 ? 25% perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe
8.30 ? 20% -3.9 4.45 ? 25% perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe
2.35 ? 19% -1.6 0.75 ? 25% perf-profile.calltrace.cycles-pp.__x64_sys_sync.do_syscall_64.entry_SYSCALL_64_after_hwframe
2.35 ? 19% -1.6 0.75 ? 25% perf-profile.calltrace.cycles-pp.ksys_sync.__x64_sys_sync.do_syscall_64.entry_SYSCALL_64_after_hwframe
2.08 ? 19% -1.6 0.50 ? 72% perf-profile.calltrace.cycles-pp.iterate_supers.ksys_sync.__x64_sys_sync.do_syscall_64.entry_SYSCALL_64_after_hwframe
1.85 ? 25% -0.7 1.14 ? 31% perf-profile.calltrace.cycles-pp.do_mknodat.do_syscall_64.entry_SYSCALL_64_after_hwframe
1.04 ? 27% -0.7 0.36 ?106% perf-profile.calltrace.cycles-pp.xfs_inactive_ifree.xfs_inactive.xfs_fs_destroy_inode.destroy_inode.do_unlinkat
1.08 ? 27% -0.6 0.46 ? 77% perf-profile.calltrace.cycles-pp.destroy_inode.do_unlinkat.do_syscall_64.entry_SYSCALL_64_after_hwframe
1.05 ? 27% -0.6 0.45 ? 77% perf-profile.calltrace.cycles-pp.xfs_fs_destroy_inode.destroy_inode.do_unlinkat.do_syscall_64.entry_SYSCALL_64_after_hwframe
1.04 ? 27% -0.6 0.44 ? 78% perf-profile.calltrace.cycles-pp.xfs_inactive.xfs_fs_destroy_inode.destroy_inode.do_unlinkat.do_syscall_64
0.89 ? 17% -0.3 0.58 ? 9% perf-profile.calltrace.cycles-pp.worker_thread.kthread.ret_from_fork
1.21 ? 8% +0.2 1.45 ? 7% perf-profile.calltrace.cycles-pp.perf_mux_hrtimer_handler.__hrtimer_run_queues.hrtimer_interrupt.__sysvec_apic_timer_interrupt.sysvec_apic_timer_interrupt
8.13 ? 9% +2.0 10.16 ? 6% perf-profile.calltrace.cycles-pp.__hrtimer_run_queues.hrtimer_interrupt.__sysvec_apic_timer_interrupt.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt
2.35 ? 19% -1.6 0.75 ? 25% perf-profile.children.cycles-pp.__x64_sys_sync
2.35 ? 19% -1.6 0.75 ? 25% perf-profile.children.cycles-pp.ksys_sync
2.09 ? 19% -1.4 0.65 ? 25% perf-profile.children.cycles-pp.iterate_supers
2.25 ? 18% -1.1 1.14 ? 26% perf-profile.children.cycles-pp._raw_spin_lock
1.40 ? 25% -1.1 0.31 ? 54% perf-profile.children.cycles-pp.native_queued_spin_lock_slowpath
1.85 ? 25% -0.7 1.14 ? 31% perf-profile.children.cycles-pp.do_mknodat
1.08 ? 27% -0.5 0.55 ? 43% perf-profile.children.cycles-pp.destroy_inode
1.05 ? 27% -0.5 0.54 ? 42% perf-profile.children.cycles-pp.xfs_fs_destroy_inode
1.04 ? 27% -0.5 0.54 ? 43% perf-profile.children.cycles-pp.xfs_inactive
1.04 ? 27% -0.5 0.53 ? 44% perf-profile.children.cycles-pp.xfs_inactive_ifree
0.93 ? 21% -0.5 0.44 ? 24% perf-profile.children.cycles-pp.__schedule
0.49 ? 25% -0.4 0.11 ? 76% perf-profile.children.cycles-pp.pick_next_task_fair
1.05 ? 20% -0.4 0.69 ? 13% perf-profile.children.cycles-pp.find_busiest_group
0.66 ? 19% -0.3 0.32 ? 30% perf-profile.children.cycles-pp.schedule
1.00 ? 20% -0.3 0.65 ? 13% perf-profile.children.cycles-pp.update_sd_lb_stats
0.60 ? 20% -0.3 0.29 ? 31% perf-profile.children.cycles-pp.xfs_ifree
0.89 ? 17% -0.3 0.58 ? 9% perf-profile.children.cycles-pp.worker_thread
0.44 ? 26% -0.3 0.16 ? 45% perf-profile.children.cycles-pp.newidle_balance
0.49 ? 39% -0.3 0.22 ? 35% perf-profile.children.cycles-pp.xfs_fs_sync_fs
0.40 ? 49% -0.2 0.17 ? 29% perf-profile.children.cycles-pp.xfs_log_force
0.31 ? 29% -0.2 0.11 ? 56% perf-profile.children.cycles-pp.schedule_timeout
0.24 ? 60% -0.2 0.06 ? 50% perf-profile.children.cycles-pp.xfs_inobt_get_rec
0.38 ? 19% -0.2 0.21 ? 30% perf-profile.children.cycles-pp.xfs_btree_lookup
0.42 ? 14% -0.2 0.26 ? 35% perf-profile.children.cycles-pp.xfs_check_agi_freecount
0.30 ? 27% -0.2 0.14 ? 37% perf-profile.children.cycles-pp.xfs_btree_lookup_get_block
0.25 ? 30% -0.1 0.10 ? 39% perf-profile.children.cycles-pp.iterate_bdevs
0.33 ? 28% -0.1 0.19 ? 20% perf-profile.children.cycles-pp.try_to_wake_up
0.26 ? 31% -0.1 0.13 ? 23% perf-profile.children.cycles-pp.schedule_idle
0.16 ? 36% -0.1 0.03 ?102% perf-profile.children.cycles-pp.__down
0.16 ? 35% -0.1 0.04 ? 73% perf-profile.children.cycles-pp.xfs_buf_lock
0.16 ? 36% -0.1 0.04 ? 73% perf-profile.children.cycles-pp.down
0.21 ? 39% -0.1 0.09 ? 52% perf-profile.children.cycles-pp.xfs_iunlink_remove
0.19 ? 28% -0.1 0.08 ? 43% perf-profile.children.cycles-pp.xfs_buf_item_release
0.21 ? 33% -0.1 0.10 ? 35% perf-profile.children.cycles-pp.xfs_difree_inobt
0.14 ? 16% -0.1 0.04 ?104% perf-profile.children.cycles-pp._xfs_trans_bjoin
0.18 ? 30% -0.1 0.08 ? 80% perf-profile.children.cycles-pp.wait_for_completion
0.15 ? 27% -0.1 0.06 ? 53% perf-profile.children.cycles-pp.up
0.15 ? 33% -0.1 0.06 ? 81% perf-profile.children.cycles-pp.xfs_difree_finobt
0.15 ? 27% -0.1 0.08 ? 19% perf-profile.children.cycles-pp.xfs_trans_alloc
0.10 ? 29% -0.1 0.04 ? 72% perf-profile.children.cycles-pp.xfs_log_reserve
0.04 ? 77% +0.1 0.10 ? 34% perf-profile.children.cycles-pp.balance_fair
0.05 ? 79% +0.1 0.15 ? 31% perf-profile.children.cycles-pp.smpboot_thread_fn
0.58 ? 16% +0.1 0.72 ? 11% perf-profile.children.cycles-pp.update_rq_clock
1.24 ? 8% +0.3 1.52 ? 4% perf-profile.children.cycles-pp.perf_mux_hrtimer_handler
8.31 ? 9% +2.1 10.40 ? 5% perf-profile.children.cycles-pp.__hrtimer_run_queues
1.30 ? 18% -1.0 0.30 ? 54% perf-profile.self.cycles-pp.native_queued_spin_lock_slowpath
0.75 ? 21% -0.3 0.44 ? 20% perf-profile.self.cycles-pp.__percpu_counter_sum
0.43 ? 25% -0.3 0.16 ? 45% perf-profile.self.cycles-pp.down_read
0.72 ? 13% -0.2 0.47 ? 12% perf-profile.self.cycles-pp.update_sd_lb_stats
0.35 ? 15% +0.1 0.43 ? 13% perf-profile.self.cycles-pp.irqtime_account_irq
0.08 ? 60% +0.1 0.16 ? 18% perf-profile.self.cycles-pp.timerqueue_del



stress-ng.time.system_time

20 +----------------------------------------------------------------------+
| + |
18 |-+ + :: .+ |
| : : :: +.. .+ : |
16 |-+ : : : : : +. + + : + |
|: + :: : : + : + : : : : .. + |
14 |:+ + + : .+. .+ + : + : : : +.+ +. .+.|
| +.+ : +.+.+.+ +.+ + + + +.+ |
12 |-+ : : |
| :: |
10 |-+ :: |
| + |
8 |-+ O O O O O O O |
| O O O O O O O O O O O |
6 +----------------------------------------------------------------------+


stress-ng.time.percent_of_cpu_this_job_got

35 +----------------------------------------------------------------------+
| |
| + + + |
30 |-+ :: :: +: |
| : : :: +.. + + +.+ : + |
|: : :: : : : + : : : : .. : |
25 |:+ .+ + : : +. : +. : : : :.+ : |
| +.+ : +.+.+.+.+.+.+.+ + + + + +.+.+.+.|
20 |-+ : : |
| : : |
| :: |
15 |-+ : |
| + O O O O O O O |
| O O O O O O O O O O O O O O O O O O |
10 +----------------------------------------------------------------------+


stress-ng.time.voluntary_context_switches

260000 +------------------------------------------------------------------+
240000 |-+ + |
| + : +. + .+. .+. |
220000 |++.+.+ : + +. .+. + + +.+. .+.+ +.+ + +. .+. .+.|
200000 |-+ + +.+ +. .+. .+ + + + + + + |
| + + + |
180000 |-+ |
160000 |-+ |
140000 |-+ |
| |
120000 |-+ O |
100000 |-O O O O O |
| O O O O O O O |
80000 |-+ O O O O O O OO O O O O |
60000 +------------------------------------------------------------------+


stress-ng.mknod.ops

95000 +-------------------------------------------------------------------+
90000 |-+ .+. .+. .+. .+. |
|.+.+.+ + +.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+ + +. .+.+.+.|
85000 |-+ + |
80000 |-+ |
| |
75000 |-+ |
70000 |-+ |
65000 |-+ |
| |
60000 |-+ |
55000 |-+ |
| |
50000 |-O O O O O O O O O O O O O O O O O O O O O O O O O O O |
45000 +-------------------------------------------------------------------+


stress-ng.mknod.ops_per_sec

1600 +--------------------------------------------------------------------+
| .+. .+. .+ |
1500 |.+.+.+ +.+.+.+.+.+. .+.+.+.+.+..+.+.+.+.+.+.+.+.+ + + .+.+.+.|
1400 |-+ + +.+ |
| |
1300 |-+ |
1200 |-+ |
| |
1100 |-+ |
1000 |-+ |
| |
900 |-+ |
800 |-+ O O O O O O O O O O O O O O |
| O O O O O O O O O O O O O O |
700 +--------------------------------------------------------------------+


[*] bisect-good sample
[O] bisect-bad sample



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.


---
0DAY/LKP+ Test Infrastructure Open Source Technology Center
https://lists.01.org/hyperkitty/list/[email protected] Intel Corporation

Thanks,
Oliver Sang


Attachments:
(No filename) (20.04 kB)
config-5.14.0-rc1-00013-g2bf1ec0ff067 (178.09 kB)
job-script (8.46 kB)
job.yaml (5.82 kB)
reproduce (570.00 B)
Download all attachments

2021-09-03 10:34:46

by Xing Zhengjun

[permalink] [raw]
Subject: Re: [xfs] 2bf1ec0ff0: stress-ng.mknod.ops_per_sec -45.4% regression

Hi Dave,

Do you have time to look at this? Thanks.

On 8/4/2021 10:38 PM, kernel test robot wrote:
>
>
> Greeting,
>
> FYI, we noticed a -45.4% regression of stress-ng.mknod.ops_per_sec due to commit:
>
>
> commit: 2bf1ec0ff067ff8f692d261b29c713f3583f7e2a ("xfs: log forces imply data device cache flushes")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
>
> in testcase: stress-ng
> on test machine: 96 threads 2 sockets Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz with 512G memory
> with following parameters:
>
> nr_threads: 10%
> disk: 1HDD
> testtime: 60s
> fs: xfs
> class: filesystem
> test: mknod
> cpufreq_governor: performance
> ucode: 0x5003006
>
>
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <[email protected]>
>
>
> Details are as below:
> -------------------------------------------------------------------------------------------------->
>
>
> To reproduce:
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp install job.yaml # job file is attached in this email
> bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run
> bin/lkp run generated-yaml-file
>
> =========================================================================================
> class/compiler/cpufreq_governor/disk/fs/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime/ucode:
> filesystem/gcc-9/performance/1HDD/xfs/x86_64-rhel-8.3/10%/debian-10.4-x86_64-20200603.cgz/lkp-csl-2sp7/mknod/stress-ng/60s/0x5003006
>
> commit:
> 45eddb4140 ("xfs: factor out forced iclog flushes")
> 2bf1ec0ff0 ("xfs: log forces imply data device cache flushes")
>
> 45eddb414047c366 2bf1ec0ff067ff8f692d261b29c
> ---------------- ---------------------------
> %stddev %change %stddev
> \ | \
> 87135 -45.4% 47612 stress-ng.mknod.ops
> 1451 -45.4% 793.24 stress-ng.mknod.ops_per_sec
> 23.00 ? 7% -51.4% 11.17 ? 12% stress-ng.time.percent_of_cpu_this_job_got
> 13.80 ? 7% -50.7% 6.80 ? 8% stress-ng.time.system_time
> 211458 ? 2% -62.4% 79605 ? 14% stress-ng.time.voluntary_context_switches
> 0.30 ? 2% -0.1 0.18 mpstat.cpu.all.sys%
> 13993 ? 2% -38.1% 8659 softirqs.BLOCK
> 27747 -2.3% 27103 proc-vmstat.nr_slab_reclaimable
> 76223 ? 3% -57.3% 32548 ? 5% proc-vmstat.pgpgout
> 1170 ? 3% -57.3% 500.17 ? 5% vmstat.io.bo
> 10752 -47.7% 5624 ? 6% vmstat.system.cs
> 32820 -34.5% 21499 slabinfo.kmalloc-rcl-64.active_objs
> 512.67 -34.6% 335.50 slabinfo.kmalloc-rcl-64.active_slabs
> 32836 -34.5% 21508 slabinfo.kmalloc-rcl-64.num_objs
> 512.67 -34.6% 335.50 slabinfo.kmalloc-rcl-64.num_slabs
> 24913 ? 2% -42.8% 14251 interrupts.315:PCI-MSI.376832-edge.ahci[0000:00:17.0]
> 71844 ? 6% -19.9% 57564 ? 3% interrupts.CAL:Function_call_interrupts
> 206.50 ? 37% -42.9% 118.00 ? 41% interrupts.CPU1.NMI:Non-maskable_interrupts
> 206.50 ? 37% -42.9% 118.00 ? 41% interrupts.CPU1.PMI:Performance_monitoring_interrupts
> 173.17 ? 26% -31.7% 118.33 ? 38% interrupts.CPU2.NMI:Non-maskable_interrupts
> 173.17 ? 26% -31.7% 118.33 ? 38% interrupts.CPU2.PMI:Performance_monitoring_interrupts
> 189.83 ? 34% -40.6% 112.83 ? 25% interrupts.CPU49.NMI:Non-maskable_interrupts
> 189.83 ? 34% -40.6% 112.83 ? 25% interrupts.CPU49.PMI:Performance_monitoring_interrupts
> 181.67 ? 25% -38.3% 112.17 ? 24% interrupts.CPU50.NMI:Non-maskable_interrupts
> 181.67 ? 25% -38.3% 112.17 ? 24% interrupts.CPU50.PMI:Performance_monitoring_interrupts
> 1895 ? 16% -32.8% 1274 ? 20% interrupts.RES:Rescheduling_interrupts
> 3.127e+08 ? 5% -12.2% 2.746e+08 ? 3% perf-stat.i.branch-instructions
> 10683 -49.8% 5364 ? 6% perf-stat.i.context-switches
> 3.866e+08 ? 4% -14.2% 3.318e+08 ? 3% perf-stat.i.dTLB-loads
> 1.949e+08 ? 3% -14.7% 1.662e+08 ? 3% perf-stat.i.dTLB-stores
> 1.538e+09 ? 5% -12.4% 1.348e+09 ? 3% perf-stat.i.instructions
> 9.31 ? 4% -13.6% 8.04 ? 3% perf-stat.i.metric.M/sec
> 127426 ? 14% -32.6% 85864 ? 9% perf-stat.i.node-load-misses
> 3.078e+08 ? 5% -12.2% 2.702e+08 ? 3% perf-stat.ps.branch-instructions
> 10512 -49.8% 5279 ? 6% perf-stat.ps.context-switches
> 3.805e+08 ? 4% -14.2% 3.265e+08 ? 3% perf-stat.ps.dTLB-loads
> 1.918e+08 ? 3% -14.7% 1.635e+08 ? 3% perf-stat.ps.dTLB-stores
> 1.514e+09 ? 5% -12.4% 1.327e+09 ? 3% perf-stat.ps.instructions
> 125399 ? 14% -32.6% 84480 ? 9% perf-stat.ps.node-load-misses
> 9.563e+10 ? 6% -12.3% 8.383e+10 ? 3% perf-stat.total.instructions
> 8.31 ? 20% -3.9 4.45 ? 25% perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe
> 8.30 ? 20% -3.9 4.45 ? 25% perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 2.35 ? 19% -1.6 0.75 ? 25% perf-profile.calltrace.cycles-pp.__x64_sys_sync.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 2.35 ? 19% -1.6 0.75 ? 25% perf-profile.calltrace.cycles-pp.ksys_sync.__x64_sys_sync.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 2.08 ? 19% -1.6 0.50 ? 72% perf-profile.calltrace.cycles-pp.iterate_supers.ksys_sync.__x64_sys_sync.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 1.85 ? 25% -0.7 1.14 ? 31% perf-profile.calltrace.cycles-pp.do_mknodat.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 1.04 ? 27% -0.7 0.36 ?106% perf-profile.calltrace.cycles-pp.xfs_inactive_ifree.xfs_inactive.xfs_fs_destroy_inode.destroy_inode.do_unlinkat
> 1.08 ? 27% -0.6 0.46 ? 77% perf-profile.calltrace.cycles-pp.destroy_inode.do_unlinkat.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 1.05 ? 27% -0.6 0.45 ? 77% perf-profile.calltrace.cycles-pp.xfs_fs_destroy_inode.destroy_inode.do_unlinkat.do_syscall_64.entry_SYSCALL_64_after_hwframe
> 1.04 ? 27% -0.6 0.44 ? 78% perf-profile.calltrace.cycles-pp.xfs_inactive.xfs_fs_destroy_inode.destroy_inode.do_unlinkat.do_syscall_64
> 0.89 ? 17% -0.3 0.58 ? 9% perf-profile.calltrace.cycles-pp.worker_thread.kthread.ret_from_fork
> 1.21 ? 8% +0.2 1.45 ? 7% perf-profile.calltrace.cycles-pp.perf_mux_hrtimer_handler.__hrtimer_run_queues.hrtimer_interrupt.__sysvec_apic_timer_interrupt.sysvec_apic_timer_interrupt
> 8.13 ? 9% +2.0 10.16 ? 6% perf-profile.calltrace.cycles-pp.__hrtimer_run_queues.hrtimer_interrupt.__sysvec_apic_timer_interrupt.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt
> 2.35 ? 19% -1.6 0.75 ? 25% perf-profile.children.cycles-pp.__x64_sys_sync
> 2.35 ? 19% -1.6 0.75 ? 25% perf-profile.children.cycles-pp.ksys_sync
> 2.09 ? 19% -1.4 0.65 ? 25% perf-profile.children.cycles-pp.iterate_supers
> 2.25 ? 18% -1.1 1.14 ? 26% perf-profile.children.cycles-pp._raw_spin_lock
> 1.40 ? 25% -1.1 0.31 ? 54% perf-profile.children.cycles-pp.native_queued_spin_lock_slowpath
> 1.85 ? 25% -0.7 1.14 ? 31% perf-profile.children.cycles-pp.do_mknodat
> 1.08 ? 27% -0.5 0.55 ? 43% perf-profile.children.cycles-pp.destroy_inode
> 1.05 ? 27% -0.5 0.54 ? 42% perf-profile.children.cycles-pp.xfs_fs_destroy_inode
> 1.04 ? 27% -0.5 0.54 ? 43% perf-profile.children.cycles-pp.xfs_inactive
> 1.04 ? 27% -0.5 0.53 ? 44% perf-profile.children.cycles-pp.xfs_inactive_ifree
> 0.93 ? 21% -0.5 0.44 ? 24% perf-profile.children.cycles-pp.__schedule
> 0.49 ? 25% -0.4 0.11 ? 76% perf-profile.children.cycles-pp.pick_next_task_fair
> 1.05 ? 20% -0.4 0.69 ? 13% perf-profile.children.cycles-pp.find_busiest_group
> 0.66 ? 19% -0.3 0.32 ? 30% perf-profile.children.cycles-pp.schedule
> 1.00 ? 20% -0.3 0.65 ? 13% perf-profile.children.cycles-pp.update_sd_lb_stats
> 0.60 ? 20% -0.3 0.29 ? 31% perf-profile.children.cycles-pp.xfs_ifree
> 0.89 ? 17% -0.3 0.58 ? 9% perf-profile.children.cycles-pp.worker_thread
> 0.44 ? 26% -0.3 0.16 ? 45% perf-profile.children.cycles-pp.newidle_balance
> 0.49 ? 39% -0.3 0.22 ? 35% perf-profile.children.cycles-pp.xfs_fs_sync_fs
> 0.40 ? 49% -0.2 0.17 ? 29% perf-profile.children.cycles-pp.xfs_log_force
> 0.31 ? 29% -0.2 0.11 ? 56% perf-profile.children.cycles-pp.schedule_timeout
> 0.24 ? 60% -0.2 0.06 ? 50% perf-profile.children.cycles-pp.xfs_inobt_get_rec
> 0.38 ? 19% -0.2 0.21 ? 30% perf-profile.children.cycles-pp.xfs_btree_lookup
> 0.42 ? 14% -0.2 0.26 ? 35% perf-profile.children.cycles-pp.xfs_check_agi_freecount
> 0.30 ? 27% -0.2 0.14 ? 37% perf-profile.children.cycles-pp.xfs_btree_lookup_get_block
> 0.25 ? 30% -0.1 0.10 ? 39% perf-profile.children.cycles-pp.iterate_bdevs
> 0.33 ? 28% -0.1 0.19 ? 20% perf-profile.children.cycles-pp.try_to_wake_up
> 0.26 ? 31% -0.1 0.13 ? 23% perf-profile.children.cycles-pp.schedule_idle
> 0.16 ? 36% -0.1 0.03 ?102% perf-profile.children.cycles-pp.__down
> 0.16 ? 35% -0.1 0.04 ? 73% perf-profile.children.cycles-pp.xfs_buf_lock
> 0.16 ? 36% -0.1 0.04 ? 73% perf-profile.children.cycles-pp.down
> 0.21 ? 39% -0.1 0.09 ? 52% perf-profile.children.cycles-pp.xfs_iunlink_remove
> 0.19 ? 28% -0.1 0.08 ? 43% perf-profile.children.cycles-pp.xfs_buf_item_release
> 0.21 ? 33% -0.1 0.10 ? 35% perf-profile.children.cycles-pp.xfs_difree_inobt
> 0.14 ? 16% -0.1 0.04 ?104% perf-profile.children.cycles-pp._xfs_trans_bjoin
> 0.18 ? 30% -0.1 0.08 ? 80% perf-profile.children.cycles-pp.wait_for_completion
> 0.15 ? 27% -0.1 0.06 ? 53% perf-profile.children.cycles-pp.up
> 0.15 ? 33% -0.1 0.06 ? 81% perf-profile.children.cycles-pp.xfs_difree_finobt
> 0.15 ? 27% -0.1 0.08 ? 19% perf-profile.children.cycles-pp.xfs_trans_alloc
> 0.10 ? 29% -0.1 0.04 ? 72% perf-profile.children.cycles-pp.xfs_log_reserve
> 0.04 ? 77% +0.1 0.10 ? 34% perf-profile.children.cycles-pp.balance_fair
> 0.05 ? 79% +0.1 0.15 ? 31% perf-profile.children.cycles-pp.smpboot_thread_fn
> 0.58 ? 16% +0.1 0.72 ? 11% perf-profile.children.cycles-pp.update_rq_clock
> 1.24 ? 8% +0.3 1.52 ? 4% perf-profile.children.cycles-pp.perf_mux_hrtimer_handler
> 8.31 ? 9% +2.1 10.40 ? 5% perf-profile.children.cycles-pp.__hrtimer_run_queues
> 1.30 ? 18% -1.0 0.30 ? 54% perf-profile.self.cycles-pp.native_queued_spin_lock_slowpath
> 0.75 ? 21% -0.3 0.44 ? 20% perf-profile.self.cycles-pp.__percpu_counter_sum
> 0.43 ? 25% -0.3 0.16 ? 45% perf-profile.self.cycles-pp.down_read
> 0.72 ? 13% -0.2 0.47 ? 12% perf-profile.self.cycles-pp.update_sd_lb_stats
> 0.35 ? 15% +0.1 0.43 ? 13% perf-profile.self.cycles-pp.irqtime_account_irq
> 0.08 ? 60% +0.1 0.16 ? 18% perf-profile.self.cycles-pp.timerqueue_del
>
>
>
> stress-ng.time.system_time
>
> 20 +----------------------------------------------------------------------+
> | + |
> 18 |-+ + :: .+ |
> | : : :: +.. .+ : |
> 16 |-+ : : : : : +. + + : + |
> |: + :: : : + : + : : : : .. + |
> 14 |:+ + + : .+. .+ + : + : : : +.+ +. .+.|
> | +.+ : +.+.+.+ +.+ + + + +.+ |
> 12 |-+ : : |
> | :: |
> 10 |-+ :: |
> | + |
> 8 |-+ O O O O O O O |
> | O O O O O O O O O O O |
> 6 +----------------------------------------------------------------------+
>
>
> stress-ng.time.percent_of_cpu_this_job_got
>
> 35 +----------------------------------------------------------------------+
> | |
> | + + + |
> 30 |-+ :: :: +: |
> | : : :: +.. + + +.+ : + |
> |: : :: : : : + : : : : .. : |
> 25 |:+ .+ + : : +. : +. : : : :.+ : |
> | +.+ : +.+.+.+.+.+.+.+ + + + + +.+.+.+.|
> 20 |-+ : : |
> | : : |
> | :: |
> 15 |-+ : |
> | + O O O O O O O |
> | O O O O O O O O O O O O O O O O O O |
> 10 +----------------------------------------------------------------------+
>
>
> stress-ng.time.voluntary_context_switches
>
> 260000 +------------------------------------------------------------------+
> 240000 |-+ + |
> | + : +. + .+. .+. |
> 220000 |++.+.+ : + +. .+. + + +.+. .+.+ +.+ + +. .+. .+.|
> 200000 |-+ + +.+ +. .+. .+ + + + + + + |
> | + + + |
> 180000 |-+ |
> 160000 |-+ |
> 140000 |-+ |
> | |
> 120000 |-+ O |
> 100000 |-O O O O O |
> | O O O O O O O |
> 80000 |-+ O O O O O O OO O O O O |
> 60000 +------------------------------------------------------------------+
>
>
> stress-ng.mknod.ops
>
> 95000 +-------------------------------------------------------------------+
> 90000 |-+ .+. .+. .+. .+. |
> |.+.+.+ + +.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+ + +. .+.+.+.|
> 85000 |-+ + |
> 80000 |-+ |
> | |
> 75000 |-+ |
> 70000 |-+ |
> 65000 |-+ |
> | |
> 60000 |-+ |
> 55000 |-+ |
> | |
> 50000 |-O O O O O O O O O O O O O O O O O O O O O O O O O O O |
> 45000 +-------------------------------------------------------------------+
>
>
> stress-ng.mknod.ops_per_sec
>
> 1600 +--------------------------------------------------------------------+
> | .+. .+. .+ |
> 1500 |.+.+.+ +.+.+.+.+.+. .+.+.+.+.+..+.+.+.+.+.+.+.+.+ + + .+.+.+.|
> 1400 |-+ + +.+ |
> | |
> 1300 |-+ |
> 1200 |-+ |
> | |
> 1100 |-+ |
> 1000 |-+ |
> | |
> 900 |-+ |
> 800 |-+ O O O O O O O O O O O O O O |
> | O O O O O O O O O O O O O O |
> 700 +--------------------------------------------------------------------+
>
>
> [*] bisect-good sample
> [O] bisect-bad sample
>
>
>
> 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.
>
>
> ---
> 0DAY/LKP+ Test Infrastructure Open Source Technology Center
> https://lists.01.org/hyperkitty/list/[email protected] Intel Corporation
>
> Thanks,
> Oliver Sang
>

--
Zhengjun Xing

2021-09-09 07:10:01

by Yin, Fengwei

[permalink] [raw]
Subject: Re: [LKP] Re: [xfs] 2bf1ec0ff0: stress-ng.mknod.ops_per_sec -45.4% regression

Hi Dave,

On 9/3/2021 3:43 PM, Xing Zhengjun wrote:
> Hi Dave,
>
>    Do you have time to look at this? Thanks.
>
> On 8/4/2021 10:38 PM, kernel test robot wrote:
>>
>>
>> Greeting,
>>
>> FYI, we noticed a -45.4% regression of stress-ng.mknod.ops_per_sec due to commit:
>>
>>
>> commit: 2bf1ec0ff067ff8f692d261b29c713f3583f7e2a ("xfs: log forces imply data device cache flushes")
>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

We noticed the commit 2bf1ec0ff067ff8f692d261b29c713f3583f7e2a is actually a
fix to the race introduced by commit eef983ffeae7a1cdde8c3338155ae2dd74b8621b.

Then we did a test for stress-ng.mknod.ops_per_sec between commit:
eef983ffeae7a1cdde8c3338155ae2dd74b8621b
and its parent commit:
3468bb1ca6e8840789e13c7b9d8b0c556b4fbe79

We got:
commit:
3468bb1ca6e8840789e13c7b9d8b0c556b4fbe79
eef983ffeae7a1cdde8c3338155ae2dd74b8621b

3468bb1ca6e88407 eef983ffeae7a1cdde8c3338155
---------------- ---------------------------
fail:runs %reproduction fail:runs
| | |
112:1 456% 117:1 dmesg.timestamp:last
103:1 553% 109:1 kmsg.timestamp:last
1:1 0% 1:1 pmeter.pmeter.fail
1:1 0% 1:1 stress-ng.mknod.pass
%stddev %change %stddev
\ | \
47979 +80.6% 86655 stress-ng.mknod.ops
799.29 +80.6% 1443 stress-ng.mknod.ops_per_sec

It's like commit eef983ffeae7a1cdde8c3338155ae2dd74b8621b bought 80%
performance gain. But it introduced race issue.

Commit 2bf1ec0ff067ff8f692d261b29c713f3583f7e2a fixed the race issue
and lost about 50% performance gain. Suppose we still have 30%
performance gain with race issue fixed. So it's still a good change.

We will close this report.


Regards
Yin, Fengwei

>>
>>
>> in testcase: stress-ng
>> on test machine: 96 threads 2 sockets Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz with 512G memory
>> with following parameters:
>>
>>     nr_threads: 10%
>>     disk: 1HDD
>>     testtime: 60s
>>     fs: xfs
>>     class: filesystem
>>     test: mknod
>>     cpufreq_governor: performance
>>     ucode: 0x5003006
>>
>>
>>
>>
>> If you fix the issue, kindly add following tag
>> Reported-by: kernel test robot <[email protected]>
>>
>>
>> Details are as below:
>> -------------------------------------------------------------------------------------------------->
>>
>>
>> To reproduce:
>>
>>          git clone https://github.com/intel/lkp-tests.git
>>          cd lkp-tests
>>          bin/lkp install                job.yaml  # job file is attached in this email
>>          bin/lkp split-job --compatible job.yaml  # generate the yaml file for lkp run
>>          bin/lkp run                    generated-yaml-file
>>
>> =========================================================================================
>> class/compiler/cpufreq_governor/disk/fs/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime/ucode:
>>    filesystem/gcc-9/performance/1HDD/xfs/x86_64-rhel-8.3/10%/debian-10.4-x86_64-20200603.cgz/lkp-csl-2sp7/mknod/stress-ng/60s/0x5003006
>>
>> commit:
>>    45eddb4140 ("xfs: factor out forced iclog flushes")
>>    2bf1ec0ff0 ("xfs: log forces imply data device cache flushes")
>>
>> 45eddb414047c366 2bf1ec0ff067ff8f692d261b29c
>> ---------------- ---------------------------
>>           %stddev     %change         %stddev
>>               \          |                \
>>       87135           -45.4%      47612        stress-ng.mknod.ops
>>        1451           -45.4%     793.24        stress-ng.mknod.ops_per_sec
>>       23.00 ±  7%     -51.4%      11.17 ± 12%  stress-ng.time.percent_of_cpu_this_job_got
>>       13.80 ±  7%     -50.7%       6.80 ±  8%  stress-ng.time.system_time
>>      211458 ±  2%     -62.4%      79605 ± 14%  stress-ng.time.voluntary_context_switches
>>        0.30 ±  2%      -0.1        0.18        mpstat.cpu.all.sys%
>>       13993 ±  2%     -38.1%       8659        softirqs.BLOCK
>>       27747            -2.3%      27103        proc-vmstat.nr_slab_reclaimable
>>       76223 ±  3%     -57.3%      32548 ±  5%  proc-vmstat.pgpgout
>>        1170 ±  3%     -57.3%     500.17 ±  5%  vmstat.io.bo
>>       10752           -47.7%       5624 ±  6%  vmstat.system.cs
>>       32820           -34.5%      21499        slabinfo.kmalloc-rcl-64.active_objs
>>      512.67           -34.6%     335.50        slabinfo.kmalloc-rcl-64.active_slabs
>>       32836           -34.5%      21508        slabinfo.kmalloc-rcl-64.num_objs
>>      512.67           -34.6%     335.50        slabinfo.kmalloc-rcl-64.num_slabs
>>       24913 ±  2%     -42.8%      14251        interrupts.315:PCI-MSI.376832-edge.ahci[0000:00:17.0]
>>       71844 ±  6%     -19.9%      57564 ±  3%  interrupts.CAL:Function_call_interrupts
>>      206.50 ± 37%     -42.9%     118.00 ± 41%  interrupts.CPU1.NMI:Non-maskable_interrupts
>>      206.50 ± 37%     -42.9%     118.00 ± 41%  interrupts.CPU1.PMI:Performance_monitoring_interrupts
>>      173.17 ± 26%     -31.7%     118.33 ± 38%  interrupts.CPU2.NMI:Non-maskable_interrupts
>>      173.17 ± 26%     -31.7%     118.33 ± 38%  interrupts.CPU2.PMI:Performance_monitoring_interrupts
>>      189.83 ± 34%     -40.6%     112.83 ± 25%  interrupts.CPU49.NMI:Non-maskable_interrupts
>>      189.83 ± 34%     -40.6%     112.83 ± 25%  interrupts.CPU49.PMI:Performance_monitoring_interrupts
>>      181.67 ± 25%     -38.3%     112.17 ± 24%  interrupts.CPU50.NMI:Non-maskable_interrupts
>>      181.67 ± 25%     -38.3%     112.17 ± 24%  interrupts.CPU50.PMI:Performance_monitoring_interrupts
>>        1895 ± 16%     -32.8%       1274 ± 20%  interrupts.RES:Rescheduling_interrupts
>>   3.127e+08 ±  5%     -12.2%  2.746e+08 ±  3%  perf-stat.i.branch-instructions
>>       10683           -49.8%       5364 ±  6%  perf-stat.i.context-switches
>>   3.866e+08 ±  4%     -14.2%  3.318e+08 ±  3%  perf-stat.i.dTLB-loads
>>   1.949e+08 ±  3%     -14.7%  1.662e+08 ±  3%  perf-stat.i.dTLB-stores
>>   1.538e+09 ±  5%     -12.4%  1.348e+09 ±  3%  perf-stat.i.instructions
>>        9.31 ±  4%     -13.6%       8.04 ±  3%  perf-stat.i.metric.M/sec
>>      127426 ± 14%     -32.6%      85864 ±  9%  perf-stat.i.node-load-misses
>>   3.078e+08 ±  5%     -12.2%  2.702e+08 ±  3%  perf-stat.ps.branch-instructions
>>       10512           -49.8%       5279 ±  6%  perf-stat.ps.context-switches
>>   3.805e+08 ±  4%     -14.2%  3.265e+08 ±  3%  perf-stat.ps.dTLB-loads
>>   1.918e+08 ±  3%     -14.7%  1.635e+08 ±  3%  perf-stat.ps.dTLB-stores
>>   1.514e+09 ±  5%     -12.4%  1.327e+09 ±  3%  perf-stat.ps.instructions
>>      125399 ± 14%     -32.6%      84480 ±  9%  perf-stat.ps.node-load-misses
>>   9.563e+10 ±  6%     -12.3%  8.383e+10 ±  3%  perf-stat.total.instructions
>>        8.31 ± 20%      -3.9        4.45 ± 25%  perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe
>>        8.30 ± 20%      -3.9        4.45 ± 25%  perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe
>>        2.35 ± 19%      -1.6        0.75 ± 25%  perf-profile.calltrace.cycles-pp.__x64_sys_sync.do_syscall_64.entry_SYSCALL_64_after_hwframe
>>        2.35 ± 19%      -1.6        0.75 ± 25%  perf-profile.calltrace.cycles-pp.ksys_sync.__x64_sys_sync.do_syscall_64.entry_SYSCALL_64_after_hwframe
>>        2.08 ± 19%      -1.6        0.50 ± 72%  perf-profile.calltrace.cycles-pp.iterate_supers.ksys_sync.__x64_sys_sync.do_syscall_64.entry_SYSCALL_64_after_hwframe
>>        1.85 ± 25%      -0.7        1.14 ± 31%  perf-profile.calltrace.cycles-pp.do_mknodat.do_syscall_64.entry_SYSCALL_64_after_hwframe
>>        1.04 ± 27%      -0.7        0.36 ±106%  perf-profile.calltrace.cycles-pp.xfs_inactive_ifree.xfs_inactive.xfs_fs_destroy_inode.destroy_inode.do_unlinkat
>>        1.08 ± 27%      -0.6        0.46 ± 77%  perf-profile.calltrace.cycles-pp.destroy_inode.do_unlinkat.do_syscall_64.entry_SYSCALL_64_after_hwframe
>>        1.05 ± 27%      -0.6        0.45 ± 77%  perf-profile.calltrace.cycles-pp.xfs_fs_destroy_inode.destroy_inode.do_unlinkat.do_syscall_64.entry_SYSCALL_64_after_hwframe
>>        1.04 ± 27%      -0.6        0.44 ± 78%  perf-profile.calltrace.cycles-pp.xfs_inactive.xfs_fs_destroy_inode.destroy_inode.do_unlinkat.do_syscall_64
>>        0.89 ± 17%      -0.3        0.58 ±  9%  perf-profile.calltrace.cycles-pp.worker_thread.kthread.ret_from_fork
>>        1.21 ±  8%      +0.2        1.45 ±  7%  perf-profile.calltrace.cycles-pp.perf_mux_hrtimer_handler.__hrtimer_run_queues.hrtimer_interrupt.__sysvec_apic_timer_interrupt.sysvec_apic_timer_interrupt
>>        8.13 ±  9%      +2.0       10.16 ±  6%  perf-profile.calltrace.cycles-pp.__hrtimer_run_queues.hrtimer_interrupt.__sysvec_apic_timer_interrupt.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt
>>        2.35 ± 19%      -1.6        0.75 ± 25%  perf-profile.children.cycles-pp.__x64_sys_sync
>>        2.35 ± 19%      -1.6        0.75 ± 25%  perf-profile.children.cycles-pp.ksys_sync
>>        2.09 ± 19%      -1.4        0.65 ± 25%  perf-profile.children.cycles-pp.iterate_supers
>>        2.25 ± 18%      -1.1        1.14 ± 26%  perf-profile.children.cycles-pp._raw_spin_lock
>>        1.40 ± 25%      -1.1        0.31 ± 54%  perf-profile.children.cycles-pp.native_queued_spin_lock_slowpath
>>        1.85 ± 25%      -0.7        1.14 ± 31%  perf-profile.children.cycles-pp.do_mknodat
>>        1.08 ± 27%      -0.5        0.55 ± 43%  perf-profile.children.cycles-pp.destroy_inode
>>        1.05 ± 27%      -0.5        0.54 ± 42%  perf-profile.children.cycles-pp.xfs_fs_destroy_inode
>>        1.04 ± 27%      -0.5        0.54 ± 43%  perf-profile.children.cycles-pp.xfs_inactive
>>        1.04 ± 27%      -0.5        0.53 ± 44%  perf-profile.children.cycles-pp.xfs_inactive_ifree
>>        0.93 ± 21%      -0.5        0.44 ± 24%  perf-profile.children.cycles-pp.__schedule
>>        0.49 ± 25%      -0.4        0.11 ± 76%  perf-profile.children.cycles-pp.pick_next_task_fair
>>        1.05 ± 20%      -0.4        0.69 ± 13%  perf-profile.children.cycles-pp.find_busiest_group
>>        0.66 ± 19%      -0.3        0.32 ± 30%  perf-profile.children.cycles-pp.schedule
>>        1.00 ± 20%      -0.3        0.65 ± 13%  perf-profile.children.cycles-pp.update_sd_lb_stats
>>        0.60 ± 20%      -0.3        0.29 ± 31%  perf-profile.children.cycles-pp.xfs_ifree
>>        0.89 ± 17%      -0.3        0.58 ±  9%  perf-profile.children.cycles-pp.worker_thread
>>        0.44 ± 26%      -0.3        0.16 ± 45%  perf-profile.children.cycles-pp.newidle_balance
>>        0.49 ± 39%      -0.3        0.22 ± 35%  perf-profile.children.cycles-pp.xfs_fs_sync_fs
>>        0.40 ± 49%      -0.2        0.17 ± 29%  perf-profile.children.cycles-pp.xfs_log_force
>>        0.31 ± 29%      -0.2        0.11 ± 56%  perf-profile.children.cycles-pp.schedule_timeout
>>        0.24 ± 60%      -0.2        0.06 ± 50%  perf-profile.children.cycles-pp.xfs_inobt_get_rec
>>        0.38 ± 19%      -0.2        0.21 ± 30%  perf-profile.children.cycles-pp.xfs_btree_lookup
>>        0.42 ± 14%      -0.2        0.26 ± 35%  perf-profile.children.cycles-pp.xfs_check_agi_freecount
>>        0.30 ± 27%      -0.2        0.14 ± 37%  perf-profile.children.cycles-pp.xfs_btree_lookup_get_block
>>        0.25 ± 30%      -0.1        0.10 ± 39%  perf-profile.children.cycles-pp.iterate_bdevs
>>        0.33 ± 28%      -0.1        0.19 ± 20%  perf-profile.children.cycles-pp.try_to_wake_up
>>        0.26 ± 31%      -0.1        0.13 ± 23%  perf-profile.children.cycles-pp.schedule_idle
>>        0.16 ± 36%      -0.1        0.03 ±102%  perf-profile.children.cycles-pp.__down
>>        0.16 ± 35%      -0.1        0.04 ± 73%  perf-profile.children.cycles-pp.xfs_buf_lock
>>        0.16 ± 36%      -0.1        0.04 ± 73%  perf-profile.children.cycles-pp.down
>>        0.21 ± 39%      -0.1        0.09 ± 52%  perf-profile.children.cycles-pp.xfs_iunlink_remove
>>        0.19 ± 28%      -0.1        0.08 ± 43%  perf-profile.children.cycles-pp.xfs_buf_item_release
>>        0.21 ± 33%      -0.1        0.10 ± 35%  perf-profile.children.cycles-pp.xfs_difree_inobt
>>        0.14 ± 16%      -0.1        0.04 ±104%  perf-profile.children.cycles-pp._xfs_trans_bjoin
>>        0.18 ± 30%      -0.1        0.08 ± 80%  perf-profile.children.cycles-pp.wait_for_completion
>>        0.15 ± 27%      -0.1        0.06 ± 53%  perf-profile.children.cycles-pp.up
>>        0.15 ± 33%      -0.1        0.06 ± 81%  perf-profile.children.cycles-pp.xfs_difree_finobt
>>        0.15 ± 27%      -0.1        0.08 ± 19%  perf-profile.children.cycles-pp.xfs_trans_alloc
>>        0.10 ± 29%      -0.1        0.04 ± 72%  perf-profile.children.cycles-pp.xfs_log_reserve
>>        0.04 ± 77%      +0.1        0.10 ± 34%  perf-profile.children.cycles-pp.balance_fair
>>        0.05 ± 79%      +0.1        0.15 ± 31%  perf-profile.children.cycles-pp.smpboot_thread_fn
>>        0.58 ± 16%      +0.1        0.72 ± 11%  perf-profile.children.cycles-pp.update_rq_clock
>>        1.24 ±  8%      +0.3        1.52 ±  4%  perf-profile.children.cycles-pp.perf_mux_hrtimer_handler
>>        8.31 ±  9%      +2.1       10.40 ±  5%  perf-profile.children.cycles-pp.__hrtimer_run_queues
>>        1.30 ± 18%      -1.0        0.30 ± 54%  perf-profile.self.cycles-pp.native_queued_spin_lock_slowpath
>>        0.75 ± 21%      -0.3        0.44 ± 20%  perf-profile.self.cycles-pp.__percpu_counter_sum
>>        0.43 ± 25%      -0.3        0.16 ± 45%  perf-profile.self.cycles-pp.down_read
>>        0.72 ± 13%      -0.2        0.47 ± 12%  perf-profile.self.cycles-pp.update_sd_lb_stats
>>        0.35 ± 15%      +0.1        0.43 ± 13%  perf-profile.self.cycles-pp.irqtime_account_irq
>>        0.08 ± 60%      +0.1        0.16 ± 18%  perf-profile.self.cycles-pp.timerqueue_del
>>
>>
>>                                                                                                              stress-ng.time.system_time
>>                                                                                     20 +----------------------------------------------------------------------+
>>       |            +                                                         |
>>    18 |-+     +   ::                                       .+                |
>>       |      : :  ::                   +..               .+  :               |
>>    16 |-+    : : :  :                 :       +.    +   +    :     +         |
>>       |:    +   ::  :                 :   +  :  +  : : :      :  .. +        |
>>    14 |:+  +    +   :         .+.   .+     + :   + : : :      +.+    +.   .+.|
>>       | +.+         :  +.+.+.+   +.+        +     +   +                +.+   |
>>    12 |-+           :  :                                                     |
>>       |              ::                                                      |
>>    10 |-+            ::                                                      |
>>       |              +                                                       |
>>     8 |-+                    O   O   O      O   O       O O                  |
>>       | O O     O    O     O   O       O      O   O O       O                |
>>     6 +----------------------------------------------------------------------+
>>                                                                                                                                                                                                                                                                       stress-ng.time.percent_of_cpu_this_job_got
>>                                                                                     35 +----------------------------------------------------------------------+
>>       |                                                                      |
>>       |       +    +                                        +                |
>>    30 |-+     ::  ::                                       +:                |
>>       |      : :  ::                   +..    +     +   +.+  :     +         |
>>       |:     :  ::  :                 :      : +   : : :     :   .. :        |
>>    25 |:+  .+   +   :                 :   +. :  +. : : :      :.+   :        |
>>       | +.+         :  +.+.+.+.+.+.+.+      +     +   +       +      +.+.+.+.|
>>    20 |-+           :  :                                                     |
>>       |             : :                                                      |
>>       |              ::                                                      |
>>    15 |-+            :                                                       |
>>       |              +       O   O   O      O   O       O O                  |
>>       | O O O O O  O O O O O   O   O   O  O   O   O O       O                |
>>    10 +----------------------------------------------------------------------+
>>                                                                                                                                                                                                                                                                          stress-ng.time.voluntary_context_switches
>>                                                                                     260000 +------------------------------------------------------------------+
>>    240000 |-+     +                                                          |
>>           |      + :  +.                  +                 .+. .+.          |
>>    220000 |++.+.+  : +  +.   .+.         + + +.+. .+.+   +.+   +   +. .+. .+.|
>>    200000 |-+       +     +.+   +. .+. .+   +    +    + +            +   +   |
>>           |                       +   +                +                     |
>>    180000 |-+                                                                |
>>    160000 |-+                                                                |
>>    140000 |-+                                                                |
>>           |                                                                  |
>>    120000 |-+           O                                                    |
>>    100000 |-O   O         O O                          O                     |
>>           |       O   O                   O    O   O       O   O             |
>>     80000 |-+ O               O O O   O O   OO   O   O   O   O               |
>>     60000 +------------------------------------------------------------------+
>>                                                                                                                                                                                                                                                                                     stress-ng.mknod.ops
>>                                                                                     95000 +-------------------------------------------------------------------+
>>    90000 |-+    .+. .+.                                     .+. .+.          |
>>          |.+.+.+   +   +.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+.+   +   +. .+.+.+.|
>>    85000 |-+                                                         +       |
>>    80000 |-+                                                                 |
>>          |                                                                   |
>>    75000 |-+                                                                 |
>>    70000 |-+                                                                 |
>>    65000 |-+                                                                 |
>>          |                                                                   |
>>    60000 |-+                                                                 |
>>    55000 |-+                                                                 |
>>          |                                                                   |
>>    50000 |-O O O O O O O O O O O O O O O O O O O O O O O O O   O O           |
>>    45000 +-------------------------------------------------------------------+
>>                                                                                                                                                                                                                                                                                stress-ng.mknod.ops_per_sec
>>                                                                                     1600 +--------------------------------------------------------------------+
>>         |      .+.                                          .+. .+           |
>>    1500 |.+.+.+   +.+.+.+.+.+. .+.+.+.+.+..+.+.+.+.+.+.+.+.+   +  +   .+.+.+.|
>>    1400 |-+                   +                                    +.+       |
>>         |                                                                    |
>>    1300 |-+                                                                  |
>>    1200 |-+                                                                  |
>>         |                                                                    |
>>    1100 |-+                                                                  |
>>    1000 |-+                                                                  |
>>         |                                                                    |
>>     900 |-+                                                                  |
>>     800 |-+   O O   O O O     O O       O      O O     O O O     O           |
>>         | O O     O       O O     O O O    O O     O O       O O             |
>>     700 +--------------------------------------------------------------------+
>>                                                                                                                                                                   [*] bisect-good sample
>> [O] bisect-bad  sample
>>
>>
>>
>> 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.
>>
>>
>> ---
>> 0DAY/LKP+ Test Infrastructure                   Open Source Technology Center
>> https://lists.01.org/hyperkitty/list/[email protected]       Intel Corporation
>>
>> Thanks,
>> Oliver Sang
>>
>