On Sun, 25 Feb 2001, Rafael R. Sevilla wrote:
..
> Your maximum bandwidth here is of the order of 50 kbytes/second, and both
> computers will be useless for anything other than the link's activity. I
> use this to transfer files between my laptop and desktop and notice that
> transferring a large file via FTP over PLIP will saturate both computers'
> CPU's nearly to the point of unusability. Both ends have ECP enabled and
> should be using DMA, nevertheless I get load averages of 4+ in the course
> of file transfer... Any help on this?
You are doing something wrong. My (imm) Zip Drive can hit
200Kbytes/second. I think you should enable ECP+EPP in the BIOS, *and*
assign an IRQ to the parallel port (via /proc/parport).
I tried using the Zip drive on a PC with no IRQ and ECP+EPP support and
yes, 50Kbytes per second was about the top transfer rate, *and* the
machine was sluggish. It's the CPU polling the parallel port that's
killing you.. that's why you need that IRQ.
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