From: Bjørn Mork
...
> > Since you are now copying the data out of the URB's skb before
> > passing the ethernet packet upstream, is there ever any real
> > requirement to use a small rx_max? or ever change rx_max?
>
> Yes. usbnet doesn't currently recycle skbs. Continuously allocating 32
> kB skbs (or even 64 kB truesize, which is the current cdc_ncm worst
> case) on memory constrained hosts is bound to fail eventually.
Getting usbnet to recycle skb shouldn't be too hard - and will
be an immediate gain for most of the drivers.
I think they would all benefit from copying frames to new skb.
David
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