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Date:   Sat, 31 Oct 2020 14:10:49 +0800
From:   Philip Li <philip.li@...el.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     "Chen, Rong A" <rong.a.chen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Hugh Dickins <hughd@...gle.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Matthew Auld <matthew.auld@...el.com>,
        William Kucharski <william.kucharski@...cle.com>,
        Qian Cai <cai@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
        lkp@...ts.01.org, lkp@...el.com, zhengjun.xing@...el.com
Subject: Re: [LKP] Re: [mm] e6e88712e4: stress-ng.tmpfs.ops_per_sec -69.7%
 regression

On Fri, Oct 30, 2020 at 02:58:35PM +0000, Matthew Wilcox wrote:
> On Fri, Oct 30, 2020 at 10:02:45PM +0800, Chen, Rong A wrote:
> > On 10/30/2020 9:17 PM, Matthew Wilcox wrote:
> > > On Fri, Oct 30, 2020 at 03:17:15PM +0800, kernel test robot wrote:
> > > > 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 run     job.yaml
> > > 
> > > Do you actually test these instructions before you send them out?
> > > 
> > > hdd_partitions: "/dev/disk/by-id/ata-WDC_WD2500BEKT-00PVMT0_WD-WX11A23L4840-part
> > > 1"
> > > ssd_partitions: "/dev/nvme1n1p1 /dev/nvme0n1p1"
> > > rootfs_partition: "/dev/disk/by-id/ata-INTEL_SSDSC2CW240A3_CVCV204303WP240CGN-part1"
> > > 
> > > That's _very_ specific to a given machine.  I'm not familiar with
> > > this test, so I don't know what I need to change.
> > 
> > 
> > Hi Matthew,
> > 
> > Sorry about that, I copied the job.yaml file from the server,
> > the right way to do is to set your disk partitions in the yaml,
> > please see https://github.com/intel/lkp-tests#run-your-own-disk-partitions.
> > 
> > there is another reproduce script attached in the original mail
> > for your reference.
> 
> Can you reproduce this?  Here's my results:
thanks for quick check, we will provide update right after the weekend. Sorry
for any inconvenience for the reproduction side so far. We need to improve
this part.

> 
> # stress-ng "--timeout" "100" "--times" "--verify" "--metrics-brief" "--sequential" "96" "--class" "memory" "--minimize" "--exclude" "spawn,exec,swap,stack,atomic,bad-altstack,bsearch,context,full,heapsort,hsearch,judy,lockbus,lsearch,malloc,matrix-3d,matrix,mcontend,membarrier,memcpy,memfd,memrate,memthrash,mergesort,mincore,null,numa,pipe,pipeherd,qsort,radixsort,remap,resources,rmap,shellsort,skiplist,stackmmap,str,stream,tlb-shootdown,tree,tsearch,vm-addr,vm-rw,vm-segv,vm,wcs,zero,zlib"
> stress-ng: info:  [7670] disabled 'oom-pipe' as it may hang or reboot the machine (enable it with the --pathological option)
> stress-ng: info:  [7670] dispatching hogs: 96 tmpfs
> stress-ng: info:  [7670] successful run completed in 100.23s (1 min, 40.23 secs)
> stress-ng: info:  [7670] stressor       bogo ops real time  usr time  sys time   bogo ops/s   bogo ops/s
> stress-ng: info:  [7670]                           (secs)    (secs)    (secs)   (real time) (usr+sys time)
> stress-ng: info:  [7670] tmpfs              8216    100.10    368.02    230.89        82.08        13.72
> stress-ng: info:  [7670] for a 100.23s run time:
> stress-ng: info:  [7670]     601.38s available CPU time
> stress-ng: info:  [7670]     368.71s user time   ( 61.31%)
> stress-ng: info:  [7670]     231.55s system time ( 38.50%)
> stress-ng: info:  [7670]     600.26s total time  ( 99.81%)
> stress-ng: info:  [7670] load average: 78.32 27.87 10.10
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