linux-toradex.git/net/ipv4/tcp_hybla.c, branch v3.4.97 Linux kernel for Apalis and Colibri modules tcp: mark tcp_congestion_ops read_mostly 2011-03-10T08:40:17+00:00 Stephen Hemminger shemminger@vyatta.com 2011-03-10T08:40:17+00:00 a252bebe22155313ccdadc20b79f67a239dc9ecb Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
TCP: tcp_hybla: Fix integer overflow in slow start increment 2010-06-02T14:15:48+00:00 Daniele Lacamera root@danielinux.net 2010-06-02T02:02:04+00:00 edafe502404f3669d364b6e96d79b54067b634b4 For large values of rtt, 2^rho operation may overflow u32. Clamp down the increment to 2^16. Signed-off-by: Daniele Lacamera <root@danielinux.net> Signed-off-by: David S. Miller <davem@davemloft.net> 
For large values of rtt, 2^rho operation may overflow u32. Clamp down the increment to 2^16.

Signed-off-by: Daniele Lacamera <root@danielinux.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
tcp: Fix tcp_hybla zero congestion window growth with small rho and large cwnd. 2008-10-07T22:58:17+00:00 Daniele Lacamera root@danielinux.net 2008-10-07T22:58:17+00:00 9d2c27e17b7574023b5adb5c6a50d7aaeb915543 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 <root@danielinux.net> Signed-off-by: David S. Miller <davem@davemloft.net> 
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 <root@danielinux.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
net: fix returning void-valued expression warnings 2008-05-01T09:47:38+00:00 Harvey Harrison harvey.harrison@gmail.com 2008-05-01T09:47:38+00:00 ab59859de1946a098b091308380179e92dc7683b 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 <harvey.harrison@gmail.com> Acked-by: Alan Cox <alan@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
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 <harvey.harrison@gmail.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[TCP]: Cong.ctrl modules: remove unused good_ack from cong_avoid 2008-01-28T22:55:41+00:00 Ilpo Järvinen ilpo.jarvinen@helsinki.fi 2007-12-01T22:47:59+00:00 c3a05c6050a339c92e49fae0ba77dbba0d41fd99 Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net> 
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
[TCP]: remove unused argument to cong_avoid op 2007-07-18T08:46:58+00:00 Stephen Hemminger shemminger@linux-foundation.org 2007-07-17T01:35:52+00:00 16751347a060a10c09b11593bb179fd5b0240c04 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 <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
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 <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
[TCP]: whitespace cleanup 2007-04-26T05:24:13+00:00 Stephen Hemminger shemminger@linux-foundation.org 2007-03-09T04:45:19+00:00 2de979bd7da9c8b39cc0aabb0ab5aa1516d929eb Add whitespace around keywords. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
Add whitespace around keywords.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
[TCP] Congestion control (modulo lp, bic): use BUILD_BUG_ON 2006-09-22T22:18:13+00:00 Alexey Dobriyan adobriyan@gmail.com 2006-08-26T00:10:33+00:00 74975d40b16fd4bad24a2e2630dc7957d8cba013 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> 
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Remove obsolete #include <linux/config.h> 2006-06-30T17:25:36+00:00 Jörn Engel joern@wohnheim.fh-wedel.de 2006-06-30T17:25:36+00:00 6ab3d5624e172c553004ecc862bfeac16d9d68b7 Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de> Signed-off-by: Adrian Bunk <bunk@stusta.de> 
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
[TCP]: fix congestion window update when using TSO deferal 2005-11-11T00:53:30+00:00 Stephen Hemminger shemminger@osdl.org 2005-11-11T00:53:30+00:00 f4805eded7d38c4e42bf473dc5eb2f34853beb06 TCP peformance with TSO over networks with delay is awful. On a 100Mbit link with 150ms delay, we get 4Mbits/sec with TSO and 50Mbits/sec without TSO. The problem is with TSO, we intentionally do not keep the maximum number of packets in flight to fill the window, we hold out to until we can send a MSS chunk. But, we also don't update the congestion window unless we have filled, as per RFC2861. This patch replaces the check for the congestion window being full with something smarter that accounts for TSO. Signed-off-by: Stephen Hemminger <shemminger@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net> 
TCP peformance with TSO over networks with delay is awful.
On a 100Mbit link with 150ms delay, we get 4Mbits/sec with TSO and
50Mbits/sec without TSO.

The problem is with TSO, we intentionally do not keep the maximum
number of packets in flight to fill the window, we hold out to until 
we can send a MSS chunk. But, we also don't update the congestion window 
unless we have filled, as per RFC2861.

This patch replaces the check for the congestion window being full
with something smarter that accounts for TSO.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>