So it's a Good Thing that Linux allocates bandwidth only on demand ... :)
You mean at open() time right? :)
That's the driver's business. If they post URBs on open, that
would be how it works. If they post URBs on read/write, it'd be
a bit different.
Seriously, the way OHCI and EHCI does bandwidth reservation is broken.
Yet you haven't identified even one problem with them. Why
don't you use OHCI for your examples.
I know the EHCI periodic scheduling is barely there, mostly
because so few people are using it that I haven't bothered
to finish off several patches. So the only relevant thing
there is the fact that the TT scheduling data is collected
and ready for use, and there's some logic that starts to
use it.
- Dave
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