path: root/Documentation/networking
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authorAndreas Petlund <apetlund@simula.no>2010-02-18 02:47:01 (GMT)
committerDavid S. Miller <davem@davemloft.net>2010-02-18 23:43:08 (GMT)
commit36e31b0af58728071e8023cf8e20c5166b700717 (patch)
tree8b4d251bf78965ac7501bea9011786b8255a3312 /Documentation/networking
parent5aa4b32fc86408705337e941ed716880c63d1590 (diff)
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 'Documentation/networking')
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 2dc7a1d..f147310 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -487,6 +487,18 @@ tcp_dma_copybreak - INTEGER
and CONFIG_NET_DMA is enabled.
Default: 4096
+tcp_thin_linear_timeouts - BOOLEAN
+ Enable dynamic triggering of linear timeouts for thin streams.
+ If set, a check is performed upon retransmission by timeout to
+ determine if the stream is thin (less than 4 packets in flight).
+ As long as the stream is found to be thin, up to 6 linear
+ timeouts may be performed before exponential backoff mode is
+ initiated. This improves retransmission latency for
+ non-aggressive thin streams, often found to be time-dependent.
+ For more information on thin streams, see
+ Documentation/networking/tcp-thin.txt
+ Default: 0
UDP variables:
udp_mem - vector of 3 INTEGERs: min, pressure, max

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