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net: TCP thin dupack

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This patch enables fast retransmissions after one dupACK for
TCP if the stream is identified as thin. This will reduce
latencies for thin streams that are not able to trigger fast
retransmissions due to high packet interarrival time. This
mechanism is only active if enabled by iocontrol or syscontrol
and the stream is identified as thin.

Signed-off-by: Andreas Petlund <apetlund@simula.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andreas Petlund
2010-02-18 04:48:19 +00:00
committed by David S. Miller
parent 36e31b0af5
commit 7e38017557
6 changed files with 42 additions and 1 deletions
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7
net/ipv4/tcp.c
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@ -2236,6 +2236,13 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
tp->thin_lto = val;
break;
case TCP_THIN_DUPACK:
if (val < 0 || val > 1)
err = -EINVAL;
else
tp->thin_dupack = val;
break;
case TCP_CORK:
/* When set indicates to always queue non-full frames.
* Later the user clears this option and we transmit