freebsd-nq/sys/modules/cc/Makefile

# $FreeBSD$

SUBDIR=	cc_cubic \
	cc_hd \
	cc_htcp \
	cc_vegas

.include <bsd.subdir.mk>
Add build infrastructure for the forthcoming CC algorithm modules. Sponsored by: FreeBSD Foundation Submitted by: David Hayes <dahayes at swin edu au> MFC after: 3 months 2010-12-02 03:10:35 +00:00			`# $FreeBSD$`

Import a clean-room implementation of the experimental H-TCP congestion control algorithm based on the Internet-Draft "draft-leith-tcp-htcp-06.txt". It is implemented as a kernel module compatible with the recently committed modular congestion control framework. H-TCP was designed to provide increased throughput in fast and long-distance networks. It attempts to maintain fairness when competing with legacy NewReno TCP in lower speed scenarios where NewReno is able to operate adequately. The paper "H-TCP: A framework for congestion control in high-speed and long-distance networks" provides additional detail. In collaboration with: David Hayes <dahayes at swin edu au> and Grenville Armitage <garmitage at swin edu au> Sponsored by: FreeBSD Foundation Reviewed by: rpaulo (older patch from a few weeks ago) MFC after: 3 months 2010-12-02 06:40:21 +00:00			`SUBDIR= cc_cubic \`
Import a clean-room implementation of the Hamilton-Delay (HD) congestion control algorithm based on the paper "A strategy for fair coexistence of loss and delay-based congestion control algorithms" by Budzisz, Stanojevic, Shorten and Baker. It is implemented as a kernel module compatible with the recently committed modular congestion control framework. HD uses a probabilistic approach to reacting to delay-based congestion. The probability of reducing cwnd is zero when the queuing delay is very small, increasing to a maximum at a set threshold, then back down to zero again when the queuing delay is high. Normal operation keeps the queuing delay below the set threshold. However, since loss-based congestion control algorithms push the queuing delay high when probing for bandwidth, having the probability of reducing cwnd drop back to zero for high delays allows HD to compete with loss-based algorithms. In collaboration with: David Hayes <dahayes at swin edu au> and Grenville Armitage <garmitage at swin edu au> Sponsored by: FreeBSD Foundation Reviewed by: bz and others along the way MFC after: 3 months 2011-02-01 06:42:46 +00:00			`cc_hd \`
Import a clean-room implementation of the VEGAS congestion control algorithm based on the paper "TCP Vegas: end to end congestion avoidance on a global internet" by Brakmo and Peterson. It is implemented as a kernel module compatible with the recently committed modular congestion control framework. VEGAS uses network delay as a congestion indicator and unlike regular loss-based algorithms, attempts to keep the network operating with stable queuing delays and no congestion losses. By keeping network buffers used along the path within a set range, queuing delays are kept low while maintaining high throughput. In collaboration with: David Hayes <dahayes at swin edu au> and Grenville Armitage <garmitage at swin edu au> Sponsored by: FreeBSD Foundation Reviewed by: bz and others along the way MFC after: 3 months 2011-02-01 06:17:00 +00:00			`cc_htcp \`
			`cc_vegas`
Add build infrastructure for the forthcoming CC algorithm modules. Sponsored by: FreeBSD Foundation Submitted by: David Hayes <dahayes at swin edu au> MFC after: 3 months 2010-12-02 03:10:35 +00:00
			`.include <bsd.subdir.mk>`