> By the way, I have looked at the code for alloc_skb in
> linux-2.5.8-pre1/net/core/skbuff.c and have no idea how this can
> help alignment. Also, to my knowledge, all USB host controllers
> do DMA (I mean PCI bus mastering, not using the motherboard's DMA
> controllers). The driver seems to work fine without the skb_reserve
> calls.
> So, please delete them if you have not done so already. Thanks
> in advance.
And then please put them back again when Adam rereads the code 8)
alloc_skb will always get an skb->data object that is 4 byte aligned. The
reserve adds 2 bytes. This places the ethernet header at
allocation base 0
skb->data starts 16
skb->data after adjust 18
IP header starts 32
Neatly landing the IP header on a cache line start for most processors
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