Just thought I'd drop a quick status note. The current EHCI
driver is behaving with the In-System adapter that's found in
the current set of HighSpeed-capable USB storage units.
(And the NEC controller found in USB 2.0 PCI cards.)
This means is that you can get megabytes per second disk
transfer speed over USB, if you use newish products. I'm
assuming there's room for performance tuning (beyond the
obvious tweak of telling EHCI to signal interrupts sooner).
I've seen individual high speed devices do bulk traffic from
6-20 MBytes/sec sustained, YMMV depending on drivers.
The code is currently best gotten from CVS at sourceforge:
http://sourceforge.net/cvs/?group_id=3581
It's the "hcd" module in CVS; "ehci-hcd" is the driver, you
can also experiment with "ohci-hcd" (no known problems).
See the README; it needs an AC kernel.
- Dave
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