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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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12
Documentation/networking/ip-sysctl.txt
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@@ -499,6 +499,18 @@ tcp_thin_linear_timeouts - BOOLEAN
Documentation/networking/tcp-thin.txt
Default: 0
tcp_thin_dupack - BOOLEAN
Enable dynamic triggering of retransmissions after one dupACK
for thin streams. If set, a check is performed upon reception
of a dupACK to determine if the stream is thin (less than 4
packets in flight). As long as the stream is found to be thin,
data is retransmitted on the first received dupACK. 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