linux-toradex.git/net/ipv4/tcp_highspeed.c, branch v4.4.136

tcp: add tcp_in_slow_start helper

2015-07-09T21:22:52+00:00

Add a helper to test the slow start condition in various congestion
control modules and other places. This is to prepare a slight improvement
in policy as to exactly when to slow start.

Signed-off-by: Yuchung Cheng 
Signed-off-by: Neal Cardwell 
Signed-off-by: Eric Dumazet 
Signed-off-by: Nandita Dukkipati 
Signed-off-by: David S. Miller

tcp: whitespace fixes

2014-09-02T01:12:45+00:00

Fix places where there is space before tab, long lines, and
awkward if(){, double spacing etc. Add blank line after declaration/initialization.

Signed-off-by: Stephen Hemminger 
Signed-off-by: David S. Miller

tcp: remove in_flight parameter from cong_avoid() methods

2014-05-03T23:23:07+00:00

Commit e114a710aa505 ("tcp: fix cwnd limited checking to improve
congestion control") obsoleted in_flight parameter from
tcp_is_cwnd_limited() and its callers.

This patch does the removal as promised.

Signed-off-by: Eric Dumazet 
Acked-by: Neal Cardwell 
Signed-off-by: David S. Miller

tcp: remove unused min_cwnd member of tcp_congestion_ops

2014-02-13T23:22:34+00:00

Commit 684bad110757 "tcp: use PRR to reduce cwin in CWR state" removed all
calls to min_cwnd, so we can safely remove it.
Also, remove tcp_reno_min_cwnd because it was only used for min_cwnd.

Signed-off-by: Stanislav Fomichev 
Acked-by: Yuchung Cheng 
Signed-off-by: David S. Miller

tcp: properly handle stretch acks in slow start

2013-11-05T00:57:59+00:00

Slow start now increases cwnd by 1 if an ACK acknowledges some packets,
regardless the number of packets. Consequently slow start performance
is highly dependent on the degree of the stretch ACKs caused by
receiver or network ACK compression mechanisms (e.g., delayed-ACK,
GRO, etc).  But slow start algorithm is to send twice the amount of
packets of packets left so it should process a stretch ACK of degree
N as if N ACKs of degree 1, then exits when cwnd exceeds ssthresh. A
follow up patch will use the remainder of the N (if greater than 1)
to adjust cwnd in the congestion avoidance phase.

In addition this patch retires the experimental limited slow start
(LSS) feature. LSS has multiple drawbacks but questionable benefit. The
fractional cwnd increase in LSS requires a loop in slow start even
though it's rarely used. Configuring such an increase step via a global
sysctl on different BDPS seems hard. Finally and most importantly the
slow start overshoot concern is now better covered by the Hybrid slow
start (hystart) enabled by default.

Signed-off-by: Yuchung Cheng 
Signed-off-by: Neal Cardwell 
Signed-off-by: Eric Dumazet 
Signed-off-by: David S. Miller

tcp: mark tcp_congestion_ops read_mostly

2011-03-10T08:40:17+00:00

Signed-off-by: Stephen Hemminger 
Signed-off-by: David S. Miller

[TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid

2008-01-28T22:55:41+00:00

Signed-off-by: Ilpo Järvinen 
Signed-off-by: Herbert Xu 
Signed-off-by: David S. Miller

[TCP]: remove unused argument to cong_avoid op

2007-07-18T08:46:58+00:00

None of the existing TCP congestion controls use the rtt value pased
in the ca_ops->cong_avoid interface.  Which is lucky because seq_rtt
could have been -1 when handling a duplicate ack.

Signed-off-by: Stephen Hemminger 
Signed-off-by: David S. Miller

[TCP] Highspeed: Limited slow-start is nowadays in tcp_slow_start

2007-05-03T20:28:35+00:00

Reuse limited slow-start (RFC3742) included into tcp_cong instead
of having another implementation in High Speed TCP.

Signed-off-by: Ilpo Järvinen 
Signed-off-by: David S. Miller

[NET] IPV4: Fix whitespace errors.

2007-02-11T07:19:39+00:00

Signed-off-by: YOSHIFUJI Hideaki 
Signed-off-by: David S. Miller