[Bug 202022] slow (780KB/s) USB2.0 + VT82xxxx + yenta (cardbus pcmcia)

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Summary: slow (780KB/s) USB2.0 + VT82xxxx + yenta (cardbus pcmcia)


https://bugzilla.redhat.com/show_bug.cgi?id=202022





------- Additional Comments From jreiser at bitwagon.com  2008-04-05 00:53 EST -------
What stands in the way of finding a more explicit cause for the slowness?  Does
changing the blocksize in the user application-level 'dd' command cause a change
in the blocksize that the driver requests from the device?  Is there any other
way I can test changing the blocksize that the driver requests?  How can I find
out the actual blocksize used by the driver<->device interface?  How can I
determine whether automatic buffered readahead is taking place?  Can I learn
useful information by poking around in the Device Manager of ControlPanel on
Windows?

The same slowness occurs with USB2.0 flash memory devices from four different
brands (PNY, SanDisk, Kingston, HP.)  

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