Re: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6

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On 08/07/19 09:01:35, Ming Lei wrote:
> > > > > > > > 
> > > > > > > > commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6
> > > > > > > > 
> > > > > > > >  [...]    
> 
> 1) run the bcc biosnoop trace in one terminal after mounting the fs on the USB dirve
> 
> 2) start the write test in another teminal
> 
> 3) wait for 10 seconds, and stop the bcc trace via ctrl^ + C, then post the bcc biosnoop
> trace log
>

Done, attached.

Thanks,
Andrea
5.420198000    jbd2/sdf1-8    6775   sdf     W  29624320  4096       0.37
5.423601000    jbd2/sdf1-8    6775   sdf     W  29624328  12288      3.29
5.424009000    jbd2/sdf1-8    6775   sdf     W  29624352  4096       0.30
6.665732000    kworker/u8:0   6401   sdf     R  10248     4096     841.64
6.666891000    kworker/u8:0   6401   sdf     R  10256     4096       0.98
6.668141000    kworker/u8:0   6401   sdf     R  4196352   4096       1.07
6.669312000    kworker/u8:0   6401   sdf     R  8390656   4096       0.99
6.670568000    kworker/u8:0   6401   sdf     R  12584960  4096       1.06
6.674257000    kworker/u8:0   6401   sdf     R  16779264  4096       3.50
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6.686360000    kworker/u8:0   6401   sdf     R  41945088  4096       3.48
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6.793831000    kworker/u8:0   6401   sdf     W  47352768  122880     7.38
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6.821103000    kworker/u8:0   6401   sdf     W  47353728  118784     7.25
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6.842813000    kworker/u8:0   6401   sdf     W  47354440  122880     7.05
6.850184000    kworker/u8:0   6401   sdf     W  47354680  122880     7.32
6.857452000    kworker/u8:0   6401   sdf     W  47354920  122880     7.22
6.864874000    kworker/u8:0   6401   sdf     W  47355160  122880     7.38
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7.581802000    kworker/u8:0   6401   sdf     W  47379472  122880     6.87
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7.603224000    kworker/u8:0   6401   sdf     W  47380192  122880     6.84
7.608655000    kworker/u8:0   6401   sdf     W  47380432  122880     5.38
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7.630413000    kworker/u8:0   6401   sdf     W  47381152  122880     7.34
7.635223000    kworker/u8:0   6401   sdf     W  47381392  122880     4.75
7.642268000    kworker/u8:0   6401   sdf     W  47381632  122880     6.98
7.649383000    kworker/u8:0   6401   sdf     W  47381872  122880     7.04
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8.268039000    kworker/u8:0   6401   sdf     W  47382592  122880   606.07
8.280414000    kworker/u8:0   6401   sdf     W  47382832  122880    12.30
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8.293627000    kworker/u8:0   6401   sdf     W  47383312  122880     7.07
8.300777000    kworker/u8:0   6401   sdf     W  47383552  122880     7.08
8.307733000    kworker/u8:0   6401   sdf     W  47383792  122880     6.89
8.315212000    kworker/u8:0   6401   sdf     W  47384032  122880     7.43
8.320697000    kworker/u8:0   6401   sdf     W  47384272  122880     5.41
8.323335000    kworker/u8:0   6401   sdf     W  47384512  32768      2.58
8.331116000    kworker/u8:0   6401   sdf     W  47384576  122880     6.58
8.338586000    kworker/u8:0   6401   sdf     W  47384816  122880     7.40
8.346113000    kworker/u8:0   6401   sdf     W  47385056  122880     7.46
8.351558000    kworker/u8:0   6401   sdf     W  47385296  122880     5.37
8.359030000    kworker/u8:0   6401   sdf     W  47385536  122880     7.43
8.366425000    kworker/u8:0   6401   sdf     W  47385776  122880     7.34
8.373712000    kworker/u8:0   6401   sdf     W  47386016  122880     7.22
8.940689000    cp             6828   sdf     W  47400960  122880   566.92
9.614647000    kworker/u8:0   6401   sdf     W  47386256  122880   673.87
10.179120000   cp             6828   sdf     W  47401200  122880   564.38

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