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authorEric Dumazet <eric.dumazet@gmail.com>2009-06-05 04:04:16 +0000
committerDavid S. Miller <davem@davemloft.net>2009-06-08 00:21:48 -0700
commit042a53a9e437feaf2230dd2cadcecfae9c7bfe05 (patch)
treeae9078f61e390a3014aecb3fe80d3438ab25ee51 /drivers/net/wan/sealevel.c
parenteae3f29cc73f83cc3f1891d3ad40021b5172c630 (diff)
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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>
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