tcp: adjust tail loss probe timeout

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This patch adjusts the timeout formula to schedule the TCP loss probe
(TLP). The previous formula uses 2*SRTT or 1.5*RTT + DelayACKMax if
only one packet is in flight. It keeps a lower bound of 10 msec which
is too large for short RTT connections (e.g. within a data-center).
The new formula = 2*RTT + (inflight == 1 ? 200ms : 2ticks) which
performs better for short and fast connections.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Yuchung Cheng 2017-07-19 15:41:26 -07:00 • committed by David S. Miller

parent c4b2bf6b4a

commit bb4d991a28

3 changed files with 12 additions and 10 deletions

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3

include/net/tcp.h

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17

net/ipv4/tcp_output.c

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2

net/ipv4/tcp_recovery.c

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