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authorAndreas Petlund <apetlund@simula.no>2010-02-18 02:47:01 +0000
committerDavid S. Miller <davem@davemloft.net>2010-02-18 15:43:08 -0800
commit36e31b0af58728071e8023cf8e20c5166b700717 (patch)
tree8b4d251bf78965ac7501bea9011786b8255a3312 /net/ipv4/tcp.c
parent5aa4b32fc86408705337e941ed716880c63d1590 (diff)
downloadop-kernel-dev-36e31b0af58728071e8023cf8e20c5166b700717.zip
op-kernel-dev-36e31b0af58728071e8023cf8e20c5166b700717.tar.gz
net: TCP thin linear timeouts
This patch will make TCP use only linear timeouts if the stream is thin. This will help to avoid the very high latencies that thin stream suffer because of exponential backoff. This mechanism is only active if enabled by iocontrol or syscontrol and the stream is identified as thin. A maximum of 6 linear timeouts is tried before exponential backoff is resumed. Signed-off-by: Andreas Petlund <apetlund@simula.no> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
-rw-r--r--net/ipv4/tcp.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index e471d03..21bae9a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2229,6 +2229,13 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
}
break;
+ case TCP_THIN_LINEAR_TIMEOUTS:
+ if (val < 0 || val > 1)
+ err = -EINVAL;
+ else
+ tp->thin_lto = val;
+ break;
+
case TCP_CORK:
/* When set indicates to always queue non-full frames.
* Later the user clears this option and we transmit
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