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
6.675510000    kworker/u8:0   6401   sdf     R  20973568  4096       1.06
6.678344000    kworker/u8:0   6401   sdf     R  25167872  4096       2.64
6.680384000    kworker/u8:0   6401   sdf     R  29362176  4096       1.83
6.681622000    kworker/u8:0   6401   sdf     R  33556480  4096       1.03
6.682713000    kworker/u8:0   6401   sdf     R  37750784  4096       0.92
6.686360000    kworker/u8:0   6401   sdf     R  41945088  4096       3.48
6.687589000    kworker/u8:0   6401   sdf     R  46139392  4096       1.04
6.688639000    kworker/u8:0   6401   sdf     R  46139424  4096       0.88
6.766336000    kworker/u8:0   6401   sdf     W  47351808  122880    77.17
6.773563000    kworker/u8:0   6401   sdf     W  47352048  122880     7.08
6.780980000    kworker/u8:0   6401   sdf     W  47352288  122880     7.29
6.786366000    kworker/u8:0   6401   sdf     W  47352528  122880     5.27
6.793831000    kworker/u8:0   6401   sdf     W  47352768  122880     7.38
6.801085000    kworker/u8:0   6401   sdf     W  47353008  122880     7.20
6.808405000    kworker/u8:0   6401   sdf     W  47353248  122880     7.27
6.813799000    kworker/u8:0   6401   sdf     W  47353488  122880     5.35
6.821103000    kworker/u8:0   6401   sdf     W  47353728  118784     7.25
6.828459000    kworker/u8:0   6401   sdf     W  47353960  122880     7.09
6.835722000    kworker/u8:0   6401   sdf     W  47354200  122880     7.20
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
6.871841000    kworker/u8:0   6401   sdf     W  47355400  122880     6.92
6.879380000    kworker/u8:0   6401   sdf     W  47355640  122880     7.50
6.886497000    kworker/u8:0   6401   sdf     W  47355880  122880     7.04
6.893940000    kworker/u8:0   6401   sdf     W  47356120  122880     7.40
6.899304000    kworker/u8:0   6401   sdf     W  47356360  122880     5.33
6.906635000    kworker/u8:0   6401   sdf     W  47356600  122880     7.29
6.913957000    kworker/u8:0   6401   sdf     W  47356840  122880     7.29
6.921308000    kworker/u8:0   6401   sdf     W  47357080  122880     7.31
6.924391000    kworker/u8:0   6401   sdf     W  47357320  53248      3.03
6.931971000    kworker/u8:0   6401   sdf     W  47357424  122880     7.22
6.939169000    kworker/u8:0   6401   sdf     W  47357664  122880     7.14
6.944985000    kworker/u8:0   6401   sdf     W  47357904  122880     5.76
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6.972393000    kworker/u8:0   6401   sdf     W  47358864  122880     5.53
6.979550000    kworker/u8:0   6401   sdf     W  47359104  122880     7.09
6.986879000    kworker/u8:0   6401   sdf     W  47359344  122880     7.28
6.994306000    kworker/u8:0   6401   sdf     W  47359584  122880     7.40
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7.008740000    kworker/u8:0   6401   sdf     W  47360064  122880     7.37
7.016114000    kworker/u8:0   6401   sdf     W  47360304  122880     7.31
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7.030437000    kworker/u8:0   6401   sdf     W  47360784  122880     6.82
7.037834000    kworker/u8:0   6401   sdf     W  47361024  122880     7.35
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7.151112000    kworker/u8:0   6401   sdf     W  47364864  122880     7.31
7.158509000    kworker/u8:0   6401   sdf     W  47365104  122880     7.33
7.165735000    kworker/u8:0   6401   sdf     W  47365344  122880     7.14
7.171205000    kworker/u8:0   6401   sdf     W  47365584  122880     5.40
7.178625000    kworker/u8:0   6401   sdf     W  47365824  122880     7.37
7.185980000    kworker/u8:0   6401   sdf     W  47366064  122880     7.31
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7.198674000    kworker/u8:0   6401   sdf     W  47366544  122880     5.02
7.205996000    kworker/u8:0   6401   sdf     W  47366784  122880     7.25
7.213419000    kworker/u8:0   6401   sdf     W  47367024  122880     7.37
7.221005000    kworker/u8:0   6401   sdf     W  47367264  122880     7.52
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7.235251000    kworker/u8:0   6401   sdf     W  47367744  122880     7.28
7.241892000    kworker/u8:0   6401   sdf     W  47367984  106496     6.59
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7.596343000    kworker/u8:0   6401   sdf     W  47379952  122880     7.30
7.603224000    kworker/u8:0   6401   sdf     W  47380192  122880     6.84
7.608655000    kworker/u8:0   6401   sdf     W  47380432  122880     5.38
7.615811000    kworker/u8:0   6401   sdf     W  47380672  122880     7.12
7.623028000    kworker/u8:0   6401   sdf     W  47380912  122880     7.18
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
7.656619000    kworker/u8:0   6401   sdf     W  47382112  122880     7.19
7.661918000    kworker/u8:0   6401   sdf     W  47382352  122880     5.25
8.268039000    kworker/u8:0   6401   sdf     W  47382592  122880   606.07
8.280414000    kworker/u8:0   6401   sdf     W  47382832  122880    12.30
8.286503000    kworker/u8:0   6401   sdf     W  47383072  122880     6.02
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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