In the first patch, I remove the costly association of SYNACK+COOKIES to a listener. I believe other parts of the stack should be ready.
The second patch removes a useless write into listener socket in tcp_rcv_state_process(), incurring false sharing in tcp_conn_request() Performance under SYNFLOOD goes from 3.2 Mpps to 6 Mpps. Test was using a single TCP listener, on a host with 8 RX queues on the NIC, and 24 cores (48 ht) Eric Dumazet (2): tcp: do not mess with listener sk_wmem_alloc tcp: remove false sharing in tcp_rcv_state_process() include/net/tcp.h | 9 +++++++-- net/ipv4/tcp_input.c | 11 ++++++----- net/ipv4/tcp_ipv4.c | 4 ++-- net/ipv4/tcp_output.c | 16 ++++++++++++---- net/ipv6/tcp_ipv6.c | 4 ++-- 5 files changed, 29 insertions(+), 15 deletions(-) -- 2.8.0.rc3.226.g39d4020
