linux-kernel - Re: [LKP] [lkp] [f2fs] ec795418c4: fsmark.files_per

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Message-ID: <87bmy15hvy.fsf@yhuang-dev.intel.com>
Date:   Mon, 31 Oct 2016 11:14:57 +0800
From:   "Huang\, Ying" <ying.huang@...el.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     "Huang\, Ying" <ying.huang@...el.com>,
        Fengguang Wu <fengguang.wu@...el.com>, LKP ML <lkp@...org>,
        huang ying <huang.ying.caritas@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [LKP] [lkp] [f2fs] ec795418c4: fsmark.files_per_sec -36.3% regression

Hi, Kim,

Jaegeuk Kim <jaegeuk@...nel.org> writes:

> On Tue, Sep 27, 2016 at 08:50:02AM +0800, Huang, Ying wrote:
>> Jaegeuk Kim <jaegeuk@...nel.org> writes:
>> 
>> > On Mon, Sep 26, 2016 at 02:26:06PM +0800, Huang, Ying wrote:
>> >> Hi, Jaegeuk,
>> >> 
>> >> "Huang, Ying" <ying.huang@...el.com> writes:
>> >> 
>> >> > Jaegeuk Kim <jaegeuk@...nel.org> writes:
>> >> >
>> >> >> Hello,
>> >> >>
>> >> >> On Sat, Aug 27, 2016 at 10:13:34AM +0800, Fengguang Wu wrote:
>> >> >>> Hi Jaegeuk,
>> >> >>> 
>> >> >>> > > >> > - [lkp] [f2fs] b93f771286: aim7.jobs-per-min -81.2% regression
>> >> >>> > > >> >
>> >> >>> > > >> > The disk is 4 12G ram disk, and setup RAID0 on them via mdadm.  The
>> >> >>> > > >> > steps for aim7 is,
>> >> >>> > > >> >
>> >> >>> > > >> > cat > workfile <<EOF
>> >> >>> > > >> > FILESIZE: 1M
>> >> >>> > > >> > POOLSIZE: 10M
>> >> >>> > > >> > 10 sync_disk_rw
>> >> >>> > > >> > EOF
>> >> >>> > > >> >
>> >> >>> > > >> > (
>> >> >>> > > >> >     echo $HOSTNAME
>> >> >>> > > >> >     echo sync_disk_rw
>> >> >>> > > >> >
>> >> >>> > > >> >     echo 1
>> >> >>> > > >> >     echo 600
>> >> >>> > > >> >     echo 2
>> >> >>> > > >> >     echo 600
>> >> >>> > > >> >     echo 1
>> >> >>> > > >> > ) | ./multitask -t &
>> >> >>> > > >>
>> >> >>> > > >> Any update on these 2 regressions?  Is the information is enough for you
>> >> >>> > > >> to reproduce?
>> >> >>> > > >
>> >> >>> > > > Sorry, I've had no time to dig this due to business travel now.
>> >> >>> > > > I'll check that when back to US.
>> >> >>> > > 
>> >> >>> > > Any update?
>> >> >>> > 
>> >> >>> > Sorry, how can I get multitask binary?
>> >> >>> 
>> >> >>> It's part of aim7, which can be downloaded here:
>> >> >>> 
>> >> >>> http://nchc.dl.sourceforge.net/project/aimbench/aim-suite7/Initial%20release/s7110.tar.Z
>> >> >>
>> >> >> Thank you for the codes.
>> >> >>
>> >> >> I've run this workload on the latest f2fs and compared performance having
>> >> >> without the reported patch. (1TB nvme SSD, 16 cores, 16GB DRAM)
>> >> >> Interestingly, I could find slight performance improvement rather than
>> >> >> regression. :(
>> >> >> Not sure how to reproduce this.
>> >> >
>> >> > I think the difference lies on disk used.  The ramdisk is used in the
>> >> > original test, but it appears that your memory is too small to setup the
>> >> > RAM disk for test.  So it may be impossible for you to reproduce the
>> >> > test unless you can find more memory :)
>> >> >
>> >> > But we can help you to root cause the issue.  What additional data do
>> >> > you want?  perf-profile data before and after the patch?
>> >> 
>> >> Any update to this regression?
>> >
>> > Sorry, no. But meanwhile, I've purchased more DRAMs. :)
>> > Now I'm with 128GB DRAM. I can configure 64GB as pmem.
>> > Is it worth to try the test again?
>> 
>> I think you are the decision maker for this.  You can judge whether the
>> test is reasonable.  And we can adjust our test accordingly.
>> 
>> BTW: For this test, we use brd ram disk and raid to test.
>
> Okay, let me try this again.

Any update on this?

Best Regards,
Huang, Ying