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Message-ID: <96fa41bb-7e9f-ae47-bf34-accef5c36fa8@linux.intel.com>
Date: Tue, 30 Nov 2021 14:46:06 +0800
From: Xing Zhengjun <zhengjun.xing@...ux.intel.com>
To: kernel test robot <oliver.sang@...el.com>,
Dave Chinner <dchinner@...hat.com>
Cc: "Darrick J. Wong" <djwong@...nel.org>,
Chandan Babu R <chandanrlinux@...il.com>,
Brian Foster <bfoster@...hat.com>,
Allison Henderson <allison.henderson@...cle.com>,
LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
lkp@...el.com
Subject: Re: [LKP] Re: [xfs] bad77c375e: stress-ng.fallocate.ops_per_sec
-10.0% regression
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@...el.com>
>>
>>
>> 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 |-+ :
>> : |
>> |
>> :: |
>> 4 |-+
>> :: |
>> |
>> :: |
>> |
>> :: |
>> 2 |-+
>> : |
>> |
>> : |
>> 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@lists.01.org Intel
>> Corporation
>>
>> Thanks,
>> Oliver Sang
>>
>
--
Zhengjun Xing
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