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| author | David S. Miller <davem@davemloft.net> | 2016-04-15 23:45:45 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-15 23:45:45 +0300 |
| commit | 125c8d1233b7dd4688f14dd992d724c20d055dee (patch) | |
| tree | fd1010fca7c152ca547f02d80a02dc9d1b9d7b20 /include | |
| parent | ac18dd9e842294377dbaf1e8d169493567a81fa1 (diff) | |
| parent | 8804b2722dc5d6f9b7ba0a9e812eae9ee5ce95bc (diff) | |
| download | linux-125c8d1233b7dd4688f14dd992d724c20d055dee.tar.xz | |
Merge branch 'tcp-synflood-perf'
Eric Dumazet says:
====================
tcp: final work on SYNFLOOD behavior
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)
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/tcp.h | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/include/net/tcp.h b/include/net/tcp.h index 74d3ed5eb219..fd40f8c64d5f 100644 --- a/include/net/tcp.h +++ b/include/net/tcp.h @@ -452,10 +452,15 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb, int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); int tcp_connect(struct sock *sk); +enum tcp_synack_type { + TCP_SYNACK_NORMAL, + TCP_SYNACK_FASTOPEN, + TCP_SYNACK_COOKIE, +}; struct sk_buff *tcp_make_synack(const struct sock *sk, struct dst_entry *dst, struct request_sock *req, struct tcp_fastopen_cookie *foc, - bool attach_req); + enum tcp_synack_type synack_type); int tcp_disconnect(struct sock *sk, int flags); void tcp_finish_connect(struct sock *sk, struct sk_buff *skb); @@ -1728,7 +1733,7 @@ struct tcp_request_sock_ops { int (*send_synack)(const struct sock *sk, struct dst_entry *dst, struct flowi *fl, struct request_sock *req, struct tcp_fastopen_cookie *foc, - bool attach_req); + enum tcp_synack_type synack_type); }; #ifdef CONFIG_SYN_COOKIES |