[Linux-parport] ASYNC I/O Reason: Reverse transfers are _slow_

Johann Klammer klammerr at aon.at
Fri Jan 22 03:09:46 EST 2010


Joining a microcontroller to my parallel port and tying to transfer data 
at about 600 kbytes/sec, the observed performance turned out to be 
rather lousy. It was about one third of the above using a stock debian 
kernel 2.6.30. So I tried to hack parport_pc and ppdev to provide an 
async io path.
I would not want to reinvent the wheel and as my kernel hacking skills 
are not impressive either, I'd like to know whether anyone is already 
working at something similar or whether it probably already exists *hope*.


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