linux-ext4 - Re: mmc: block: bonnie++ runs with errors on arc/hsdk board

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Date:   Thu, 15 Mar 2018 11:27:49 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Evgeniy Didin <Evgeniy.Didin@...opsys.com>
Cc:     "jh80.chung@...sung.com" <jh80.chung@...sung.com>,
        "Alexey.Brodkin@...opsys.com" <Alexey.Brodkin@...opsys.com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "adilger.kernel@...ger.ca" <adilger.kernel@...ger.ca>,
        "Eugeniy.Paltsev@...opsys.com" <Eugeniy.Paltsev@...opsys.com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
        "tytso@....edu" <tytso@....edu>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: mmc: block: bonnie++ runs with errors on arc/hsdk board

On 14/03/18 14:32, Evgeniy Didin wrote:
> Hi Adrian,
>>>
>>> Was the performance affected? i.e. the results from bonnie++
>>
>> I have run bonnie++ several times before and after mentioned commit. Here is output:
>> --------------------------------------------------<8-------------------------------------------------------------------------
>> Before commit:
>> ARCLinux,512M,6442,50,7211,0,5333,0,12954,99,345638,100,+++++,+++,16,22322,100,+++++,+++,32735,99,22921,100,+++++,+++,32211,100
>> ARCLinux,512M,6611,51,7248,0,5162,0,12951,99,344763,99,+++++,+++,16,22649,99,+++++,+++,32723,99,22572,100,+++++,+++,31697,100
>> ARCLinux,512M,6597,52,7307,0,5368,0,12934,99,343987,99,+++++,+++,16,22775,100,+++++,+++,32713,99,22832,100,+++++,+++,31899,99
>> After commit:
>> ARCLinux,512M,4453,36,6474,1,5852,0,12940,99,344329,100,+++++,+++,16,22168,98,+++++,+++,32760,99,22755,100,+++++,+++,32205,100
>> ARCLinux,512M,5159,42,6944,1,5658,0,12945,99,344290,100,+++++,+++,16,22295,100,+++++,+++,32715,99,22888,99,+++++,+++,32007,99
>> ARCLinux,512M,5170,42,6840,2,5315,0,12946,99,343889,100,+++++,+++,16,22445,100,+++++,+++,32681,99,22967,100,+++++,+++,32117,99
>> --------------------------------------------------<8------------------------------------------------------------------------
>>               ^^^^ 
>> If i understand correctly, in third column is shown "sequential output" per character speed (K/sec), which decreased.
>>
>>> What mount options did you use?
>>
>> I didn't use any options. Simply:
>> # mount /dev/mmcblk0p1 /mnt
> 
> Note that the file system on SDcard was ext4. 

Please try:

	perf record -a -e mmc:* -- bonnie++ -u root -r 256 -s 512 -x 1 -d /mnt

and share the resulting perf.data file when you are able
to reproduce the hung task message.

You may want to add this patch first:

	https://marc.info/?l=linux-mmc&m=152110580324200