freebsd-dev/sys/modules/cc/Makefile

# $FreeBSD$

SUBDIR=	cc_chd \
	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 an implementation of the CAIA-Hamilton-Delay (CHD) congestion control algorithm described in the paper "Improved coexistence and loss tolerance for delay based TCP congestion control" by Hayes and Armitage. It is implemented as a kernel module compatible with the recently committed modular congestion control framework. CHD enhances the approach taken by the Hamilton-Delay (HD) algorithm to provide tolerance to non-congestion related packet loss and improvements to coexistence with loss-based congestion control algorithms. A key idea in improving coexistence with loss-based congestion control algorithms is the use of a shadow window, which attempts to track how NewReno's congestion window (cwnd) would evolve. At the next packet loss congestion event, CHD uses the shadow window to correct cwnd in a way that reduces the amount of unfairness CHD experiences when competing 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 07:05:14 +00:00			`SUBDIR= cc_chd \`
			`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>`