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authorYuchung Cheng <ycheng@google.com>2012-05-02 13:30:04 +0000
committerDavid S. Miller <davem@davemloft.net>2012-05-02 20:56:10 -0400
commit750ea2bafa55aaed208b2583470ecd7122225634 (patch)
tree7656d7697566b0cecc7fbbdd8dbae288bca6d7e3 /include/linux/tcp.h
parenteed530b6c67624db3f2cf477bac7c4d005d8f7ba (diff)
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tcp: early retransmit: delayed fast retransmit
Implementing the advanced early retransmit (sysctl_tcp_early_retrans==2). Delays the fast retransmit by an interval of RTT/4. We borrow the RTO timer to implement the delay. If we receive another ACK or send a new packet, the timer is cancelled and restored to original RTO value offset by time elapsed. When the delayed-ER timer fires, we enter fast recovery and perform fast retransmit. Signed-off-by: Yuchung Cheng <ycheng@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/tcp.h')
-rw-r--r--include/linux/tcp.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 7859b416d46e..d9b42c5be088 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -372,7 +372,8 @@ struct tcp_sock {
repair : 1,
unused : 1;
u8 repair_queue;
- u8 do_early_retrans:1;/* Enable RFC5827 early-retransmit */
+ u8 do_early_retrans:1,/* Enable RFC5827 early-retransmit */
+ early_retrans_delayed:1; /* Delayed ER timer installed */
/* RTT measurement */
u32 srtt; /* smoothed round trip time << 3 */