Manuel Bouyer wrote:

> > uhci0: interrupting at irq 10
> > siop1: interrupting at irq 10
> >
> > But that's it, and uhci0 isn't doing much; I have no USB devices
> > plugged in.  ISTR that the uhci code polls a few times a second for
> > new devices, but it doesn't generate interrupts unless there are
> > devices plugged in.  I could be wrong, though.
>
> Hum, and if this was the problem this would affect both read and write
> performances.

If there are no USB devices plugged in the UHCI controller should
generate no interrupts at all.

    -- Lennart