4 commits

Author	SHA1	Message	Date
Eric Dumazet	042a53a9e4	net: skb_shared_info optimization ... skb_dma_unmap() is quite expensive for small packets, because we use two different cache lines from skb_shared_info. One to access nr_frags, one to access dma_maps[0] Instead of dma_maps being an array of MAX_SKB_FRAGS + 1 elements, let dma_head alone in a new dma_head field, close to nr_frags, to reduce cache lines misses. Tested on my dev machine (bnx2 & tg3 adapters), nice speedup ! Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>	2009-06-08 00:21:48 -07:00
Eric Dumazet	eae3f29cc7	net: num_dma_maps is not used ... Get rid of num_dma_maps in struct skb_shared_info, as it seems unused. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>	2009-06-08 00:20:23 -07:00
Dimitris Michailidis	ab396eb03f	net: Fix off-by-one in skb_dma_map ... The unwind loop iterates down to -1 instead of stopping at 0 and ends up accessing ->frags[-1]. Signed-off-by: Dimitris Michailidis <dm@chelsio.com> Signed-off-by: David S. Miller <davem@davemloft.net>	2008-10-12 21:07:34 -07:00
David S. Miller	a40c24a133	net: Add SKB DMA mapping helper functions. ... Signed-off-by: David S. Miller <davem@davemloft.net>	2008-09-11 04:51:14 -07:00