RE: [microblaze-uclinux] xenet_FifoSend(struct sk_buff *orig_skb,struct net_device *dev)

["Brettschneider Falk" <fbrettschneider@xxxxxxxxxxxxxxx>]

Hi,

John Williams wrote:
> If you can measure the time taken in other parts of FifoSend, 
> my guess 
> is a large part is the unavoidable memcpy / 
> skb_copy_and_csum_dev() calls.
unfortunately, yes. A short hack for avoiding the alloc showed the time hasn't changed significantly. :-( Though memory fragmentation may be reduced in hard-threaded systems.

> If you alloc the skb in the driver init function, and free it 
> in driver 
> shutdown, then it will not live forever (if e.g. loaded as a module).
good idea.

I saw the function pointer to xenet_FifoSend() is stored as dev->hard_start_xmit. Which higher layer uses it? Do you think it's worth to have a look if the address offset 2 can be fixed?

CU, Falk

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