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(parent: d3aaeb3) | patch
ipv4: save cpu cycles from check_leaf()
authorEric Dumazet <eric.dumazet@gmail.com>
Mon, 18 Jul 2011 03:16:33 +0000 (03:16 +0000)
committerDavid S. Miller <davem@davemloft.net>
Mon, 18 Jul 2011 17:41:18 +0000 (10:41 -0700)
commit5c74501f76360ce6f410730b9b5e5976f38e8504
tree4965fe06affeaa121afa4a18b0644cbeb9e7d639tree | snapshot
parentd3aaeb38c40e5a6c08dd31a1b64da65c4352be36commit | diff
ipv4: save cpu cycles from check_leaf()

Compiler is not smart enough to avoid double BSWAP instructions in
ntohl(inet_make_mask(plen)).

Lets cache this value in struct leaf_info, (fill a hole on 64bit arches)

With route cache disabled, this saves ~2% of cpu in udpflood bench on
x86_64 machine.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/fib_trie.c diff | blob | history
Domain: System / Kernel;