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Date: Fri, 3 Sep 2021 15:40:39 +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, ying.huang@...el.com, feng.tang@...el.com
Subject: Re: [xfs] bad77c375e: stress-ng.fallocate.ops_per_sec -10.0%
regression
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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