extremely bad USB/msdos performance

Simon 'corecode' Schubert corecode at fs.ei.tum.de
Wed Sep 23 16:41:13 PDT 2009


The performance for writing to msdosfs on an ehci usb device is 
pathetic.  I'm getting ~500KB/sec, while other OS can do at least 6MB.

the rsync process is most of the time in "iowait", "biows", "biord".

vmstat:
 tin tout  KB/t tps   MB/s   KB/t tps   MB/s   KB/t tps   MB/s  us ni 
sy in id
   8  680 60.86   56  3.33   0.00    0  0.00  10.00    2  0.02   3  0 
5  0 93
   7  400 64.00    2  0.12   0.00    0  0.00  16.00    1  0.02   1  0 
5  0 94
  10  415 64.00    2  0.12   0.00    0  0.00   0.00    0  0.00   3  0 
5  0 92
   9  528  0.00    0  0.00   0.00    0  0.00  16.00    2  0.03   2  0 
3  0 95
   9  541 64.00    4  0.25   0.00    0  0.00  16.00   86  1.34   2  0 
6  0 92
  10  399  0.00    0  0.00   0.00    0  0.00  16.00  138  2.16   4  0 
6  0 90
   8  546 64.00    2  0.12   0.00    0  0.00  16.00    4  0.06   7  0 
8  0 85
   7  509 37.75   89  3.28   0.00    0  0.00  15.68   37  0.57   3  0 
8  0 89
  10  545  0.00    0  0.00   0.00    0  0.00  16.00  131  2.05   3  0 
8  0 89
   1  104  4.00    1  0.00   0.00    0  0.00  16.00   40  0.62   5  0 
7  0 87
   2  226 48.00   86  4.03   0.00    0  0.00  14.29    7  0.10   4  0 
6  0 90
 102  100 64.00    2  0.12   0.00    0  0.00  16.00  110  1.72   2  0 
5  0 93
 126  102 64.00    2  0.12   0.00    0  0.00  16.00   37  0.58   3  0 
6  0 91
  72  103 64.00    1  0.06   0.00    0  0.00  13.29  124  1.61   0  0 
4  0 95
  42   98 64.00    1  0.06   0.00    0  0.00   0.00    0  0.00   1  0 
3  0 96
 176  225 45.40   86  3.81   0.00    0  0.00  16.00    2  0.03   4  0 
6  0 90
 136  104 19.43   84  1.59   0.00    0  0.00  16.00   11  0.17   7  0 
8  0 85
  70  121  0.00    0  0.00   0.00    0  0.00  16.00   26  0.41   1  0 
10  0 89
  26  100 64.00    5  0.31   0.00    0  0.00  16.00  140  2.19   2  0 
5  0 93
   2  219 56.79   91  5.05   0.00    0  0.00  15.79   58  0.89   3  0 
6  0 91

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