David Brownell wrote:
...
It'd be good if someone who can reproduce this would post a CATC
trace log too, but I'd expect that would just say the same thing.

Thanks for your analysis. It seems that the CATC USB tracers are very expensive, compared to an 35 EUR IDE->USB box.

Maybe the slowdown of the ehci traffic will be a good workaround
for the problem. In my case one machine works perfect now
(Kernel 2.6.1, SiS 960 chipset with VIA USB, P4 2.4GHz). The
other machine works with Alan Stern's storage patch (scsiglue.c
max_sectors = 128 instead of 240) plus usb-storage verbose
debug enabled.

Maybe there's a way to slowdown the ehci controller without
producing that much output. It's not a good solution, but at least
it makes the device a little bit more usable...

Eric

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