Am Mittwoch, 16. Mai 2007 16:41 schrieb David Brownell:
> > in that when you have
> > pre-allocated all buffers and all USB host controller descriptors, you will
> > never get in the situation of not being able to allocate transfer
> > descriptors
> > on the fly, like done on Linux.
>
> That's not a failure mode that's been often observed on Linux. (Never,
> in my own experience... which I admit has not focussed on that particular
> type of stress load.) So it's hard to argue that it should motivate a
> redesign of core APIs.
We are seeing report of the networking stack exhausting the atomic
pool. They are rare these days, but do exist.
> Transfer descriptors are an artifact of one kind of host controller;
> it'd be wrong to assume all HCDs use them.
True.
> The related issue that's been discussed is how to shrink submit paths,
> giving lower overhead.
The obvious way would be to shift more work into usb_alloc_urb()
It would imply binding an URB to an endpoint at allocation.
Regards
Oliver
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