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authorEric Dumazet <edumazet@google.com>2016-04-01 08:52:21 -0700
committerDavid S. Miller <davem@davemloft.net>2016-04-04 22:11:20 -0400
commita9d6532b567489196dac4ce60c62343e43228759 (patch)
tree950186e21f38670eb26eca351a96970a613494ad /net/ipv4/tcp_ipv4.c
parent9caad864151e525929d323de96cad382da49c3b2 (diff)
downloadblackbird-op-linux-a9d6532b567489196dac4ce60c62343e43228759.tar.gz
blackbird-op-linux-a9d6532b567489196dac4ce60c62343e43228759.zip
ipv4: tcp: set SOCK_USE_WRITE_QUEUE for ip_send_unicast_reply()
TCP uses per cpu 'sockets' to send some packets : - RST packets ( tcp_v4_send_reset()) ) - ACK packets for SYN_RECV and TIMEWAIT sockets By setting SOCK_USE_WRITE_QUEUE flag, we tell sock_wfree() to not call sk_write_space() since these internal sockets do not care. This gives a small performance improvement, merely by allowing cpu to properly predict the sock_wfree() conditional branch, and avoiding one atomic operation. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index f3ce0afe70aa..456ff3d6a132 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2384,6 +2384,7 @@ static int __net_init tcp_sk_init(struct net *net)
IPPROTO_TCP, net);
if (res)
goto fail;
+ sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
*per_cpu_ptr(net->ipv4.tcp_sk, cpu) = sk;
}
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