Re: [LKP] Re: [xfs] bad77c375e: stress-ng.fallocate.ops_per_sec -10.0% regression
From: Xing Zhengjun
Date: Tue Nov 30 2021 - 01:46:15 EST
Hi Dave,
Do you have time to look at this? It still existed in v5.16-rc3. Thanks
On 9/3/2021 3:40 PM, Xing Zhengjun wrote:
Hi Dave,
Do you have time to look at this? Thanks.
On 9/2/2021 3:27 PM, kernel test robot wrote:
Greeting,
FYI, we noticed a -10.0% regression of stress-ng.fallocate.ops_per_sec
due to commit:
commit: bad77c375e8de6c776c848e443f7dc2d0d909be5 ("xfs: CIL checkpoint
flushes caches unconditionally")
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: fallocate
cpufreq_governor: performance
ucode: 0x5003006
In addition to that, the commit also has significant impact on the
following tests:
If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
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/fallocate/stress-ng/60s/0x5003006
commit:
0431d926b3 ("xfs: async blkdev cache flush")
bad77c375e ("xfs: CIL checkpoint flushes caches unconditionally")
0431d926b399d74f bad77c375e8de6c776c848e443f
---------------- ---------------------------
%stddev %change %stddev
\ | \
618.67 -10.0% 556.67 ± 2% stress-ng.fallocate.ops
10.31 -10.0% 9.28 ± 2%
stress-ng.fallocate.ops_per_sec
111618 -5.7% 105270
stress-ng.time.voluntary_context_switches
502.67 ± 2% +52.0% 763.83 ± 47%
interrupts.CPU44.CAL:Function_call_interrupts
2.10 ± 2% -25.1% 1.57 iostat.cpu.iowait
2.16 ± 2% -0.5 1.62 mpstat.cpu.all.iowait%
0.09 ± 11% +45.0% 0.14 ± 34%
perf-sched.sch_delay.avg.ms.worker_thread.kthread.ret_from_fork
151.00 ± 19% +20.2% 181.50 ± 7%
perf-sched.wait_and_delay.count.smpboot_thread_fn.kthread.ret_from_fork
6749 +6.4% 7178
perf-stat.i.context-switches
6640 +6.4% 7063
perf-stat.ps.context-switches
353877 -1.4% 348924 proc-vmstat.pgfree
39122 -15.1% 33221 proc-vmstat.pgpgout
1225 ± 14% -9.0% 1115 turbostat.Bzy_MHz
86.82 ± 17% -10.4% 77.83 turbostat.PkgWatt
602.83 -15.1% 511.83 vmstat.io.bo
6953 +6.1% 7376 vmstat.system.cs
1.33 ± 6% +0.4 1.70 ± 13%
perf-profile.calltrace.cycles-pp.perf_mux_hrtimer_handler.__hrtimer_run_queues.hrtimer_interrupt.__sysvec_apic_timer_interrupt.sysvec_apic_timer_interrupt
0.08 ± 22% +0.1 0.17 ± 23%
perf-profile.children.cycles-pp.wait_for_completion
0.07 ± 17% +0.1 0.19 ± 64%
perf-profile.children.cycles-pp.submit_bio
0.07 ± 17% +0.1 0.19 ± 64%
perf-profile.children.cycles-pp.submit_bio_noacct
1.40 ± 8% +0.3 1.74 ± 12%
perf-profile.children.cycles-pp.perf_mux_hrtimer_handler
stress-ng.fallocate.ops_per_sec
12
+----------------------------------------------------------------------+
| |
10 |.+.++.+.+.+
+.+.+.++.+.+.++.+.+.+.++.+.+.++.+.+.++.+.+.+.++.+.+.++.+.|
| O : : O O OO O O O
OO |
| OO O :O : O O O
O |
8 |-+ O : : O O OO O O O O O O OO
O |
| :
: |
6 |-+ :
: |
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:: |
4 |-+
:: |
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:: |
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:: |
2 |-+
: |
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: |
0
+----------------------------------------------------------------------+
[*] 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/lkp@xxxxxxxxxxxx ; Intel
Corporation
Thanks,
Oliver Sang
--
Zhengjun Xing