linux-toradex.git/net/ipv4/tcp_hybla.c, branch v3.14.16

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: bool conversions

2012-05-17T18:59:59+00:00

bool conversions where possible.

__inline__ -> inline

space cleanups

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: tcp_hybla: Fix integer overflow in slow start increment

2010-06-02T14:15:48+00:00

For large values of rtt, 2^rho operation may overflow u32. Clamp down the increment to 2^16.

Signed-off-by: Daniele Lacamera 
Signed-off-by: David S. Miller

tcp: Fix tcp_hybla zero congestion window growth with small rho and large cwnd.

2008-10-07T22:58:17+00:00

Because of rounding, in certain conditions, i.e. when in congestion
avoidance state rho is smaller than 1/128 of the current cwnd, TCP
Hybla congestion control starves and the cwnd is kept constant
forever.

This patch forces an increment by one segment after #send_cwnd calls
without increments(newreno behavior).

Signed-off-by: Daniele Lacamera 
Signed-off-by: David S. Miller

net: fix returning void-valued expression warnings

2008-05-01T09:47:38+00:00

drivers/net/8390.c:37:2: warning: returning void-valued expression
drivers/net/bnx2.c:1635:3: warning: returning void-valued expression
drivers/net/xen-netfront.c:1806:2: warning: returning void-valued expression
net/ipv4/tcp_hybla.c:105:3: warning: returning void-valued expression
net/ipv4/tcp_vegas.c:171:3: warning: returning void-valued expression
net/ipv4/tcp_veno.c:123:3: warning: returning void-valued expression
net/sysctl_net.c:85:2: warning: returning void-valued expression

Signed-off-by: Harvey Harrison 
Acked-by: Alan Cox 
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]: whitespace cleanup

2007-04-26T05:24:13+00:00

Add whitespace around keywords.

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

[TCP] Congestion control (modulo lp, bic): use BUILD_BUG_ON

2006-09-22T22:18:13+00:00

Signed-off-by: Alexey Dobriyan 
Signed-off-by: David S. Miller