[Linux-usb-users] mass-storage device throughput is lower on Linux 2.6.7 than WindowsXP ??

[Daniel Miller (IMI)]

We have a USB mass-storage tester running on Linux 2.6.7.  Our 
application uses libusb (11/18 distribution).  Some of our customers 
have been reporting that our system reports lower throughputs than a 
Windows system running Sandra 2004.  To analyze the situation, we ported 
our application to Windows XP (no minor task, that), and indeed we 
report read/write speeds that are comparable with Sandra's reports.  
Typical differences for one particular device are:

Windows:  write 17.5 MB/sec, read 21.5 MB/sec
Linux:        write  13.5 MB/sec, read 17MB/sec
This is a serious deficiency in the linux application.  I do my timing 
immediate around the calls the the bulk_read and bulk_write functions, 
on both platforms, so none of our application overhead is included in 
the timing.  Why are the linux results so much slower??  Is there 
anything I can do to speed things up??

   Dan Miller

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