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authorAlexey Kuznetsov <kuznet@ms2.inr.ac.ru>2006-09-19 12:52:50 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-09-22 15:19:05 -0700
commit1ef9696c909060ccdae3ade245ca88692b49285b (patch)
tree3a2df5bbd6b448a4f873125ab5dd7c7a0cc7ae05 /include/net/inet_connection_sock.h
parent4eb327b517cf85f6cb7dcd5691e7b748cbe8c343 (diff)
[TCP]: Send ACKs each 2nd received segment.
It does not affect either mss-sized connections (obviously) or connections controlled by Nagle (because there is only one small segment in flight). The idea is to record the fact that a small segment arrives on a connection, where one small segment has already been received and still not-ACKed. In this case ACK is forced after tcp_recvmsg() drains receive buffer. In other words, it is a "soft" each-2nd-segment ACK, which is enough to preserve ACK clock even when ABC is enabled. Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/inet_connection_sock.h')
-rw-r--r--include/net/inet_connection_sock.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
index 9bf73fe5094..de4e83b6da4 100644
--- a/include/net/inet_connection_sock.h
+++ b/include/net/inet_connection_sock.h
@@ -147,7 +147,8 @@ extern struct sock *inet_csk_clone(struct sock *sk,
enum inet_csk_ack_state_t {
ICSK_ACK_SCHED = 1,
ICSK_ACK_TIMER = 2,
- ICSK_ACK_PUSHED = 4
+ ICSK_ACK_PUSHED = 4,
+ ICSK_ACK_PUSHED2 = 8
};
extern void inet_csk_init_xmit_timers(struct sock *sk,