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authorEric Dumazet <edumazet@google.com>2016-04-14 05:05:40 (GMT)
committerDavid S. Miller <davem@davemloft.net>2016-04-15 20:45:44 (GMT)
commit8804b2722dc5d6f9b7ba0a9e812eae9ee5ce95bc (patch)
treefd1010fca7c152ca547f02d80a02dc9d1b9d7b20 /scripts/mkversion
parentb3d051477cf94e9d71d6acadb8a90de15237b9c1 (diff)
downloadlinux-8804b2722dc5d6f9b7ba0a9e812eae9ee5ce95bc.tar.xz
tcp: remove false sharing in tcp_rcv_state_process()
Last known hot point during SYNFLOOD attack is the clearing of rx_opt.saw_tstamp in tcp_rcv_state_process() It is not needed for a listener, so we move it where it matters. Performance while a SYNFLOOD hits a single listener socket went from 5 Mpps to 6 Mpps on my test server (24 cores, 8 NIC RX queues) Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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