Gerrit Renker 113ced1f52 dccp ccid-2: Perform congestion-window validation ... CCID-2's cwnd increases like TCP during slow-start, which has implications for * the local Sequence Window value (should be > cwnd), * the Ack Ratio value. Hence an exponential growth, if it does not reflect the actual network conditions, can quickly lead to instability. This patch adds congestion-window validation (RFC2861) to CCID-2: * cwnd is constrained if the sender is application limited; * cwnd is reduced after a long idle period, as suggested in the '90 paper by Van Jacobson, in RFC 2581 (sec. 4.1); * cwnd is never reduced below the RFC 3390 initial window. As marked in the comments, the code is actually almost a direct copy of the TCP congestion-window-validation algorithms. By continuing this work, it may in future be possible to use the TCP code (not possible at the moment). The mechanism can be turned off using a module parameter. Sampling of the currently-used window (moving-maximum) is however done constantly; this is used to determine the expected window, which can be exploited to regulate DCCP's Sequence Window value. This patch also sets slow-start-after-idle (RFC 4341, 5.1), i.e. it behaves like TCP when net.ipv4.tcp_slow_start_after_idle = 1. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>		2011-07-04 12:37:49 -06:00
..
ccids	dccp ccid-2: Perform congestion-window validation	2011-07-04 12:37:49 -06:00
ackvec.c
ackvec.h
ccid.c	dccp: cosmetics of info message	2011-07-04 12:37:13 -06:00
ccid.h
dccp.h
diag.c
feat.c
feat.h
input.c	dccp: Clean up slow-path input processing	2011-07-04 12:36:33 -06:00
ipv4.c	ipv4: Make caller provide flowi4 key to inet_csk_route_req().	2011-05-18 18:32:03 -04:00
ipv6.c
ipv6.h
Kconfig
Makefile
minisocks.c
options.c
output.c	dccp: combine the functionality of enqeueing and cloning	2011-07-04 12:36:47 -06:00
probe.c
proto.c
qpolicy.c
sysctl.c
timer.c