tcp: remove false sharing in tcp_rcv_state_process()

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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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Eric Dumazet 2016-04-13 22:05:40 -07:00 • committed by David S. Miller

parent b3d051477c

commit 8804b2722d

1 changed files with 2 additions and 2 deletions

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net/ipv4/tcp_input.c

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