Am Mittwoch, 16. Mai 2007 19:33 schrieb Alan Stern:
> > All devices need to allocate some memory, even if they are not used. That
> > is
> > just the way it is. If you want to save memory, then USB has the advantage
> > that you can unplug the device and save resources.
>
> Of course all devices need memory. But there's a big difference
> between preallocating 4 KB and preallocating 512 KB. And if you start
> telling people they can save memory by unplugging their USB devices,
> they'll just laugh at you. Saving memory is the OS's job, not the
> user's.
If this is the problem do the allocation in usb_alloc_urb(). This way a driver
can choose to use preallocation by reusing URBs or not reusing them.
In any case allocating a single data structure is faster than at a minimum
two data structures.
Regards
Oliver
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