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Bug #1527

Updated by vsrinivas over 12 years ago

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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