Date: Sat, 28 May 2011 08:32:17 +0000 (UTC) From: Lawrence Stewart <lstewart@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/modules/cc Makefile src/sys/modules/cc/cc_hd Makefile src/sys/netinet/cc cc_hd.c Message-ID: <201105280832.p4S8WUGG020224@repoman.freebsd.org>
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lstewart 2011-05-28 08:32:17 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_8)
sys/modules/cc Makefile
Added files: (Branch: RELENG_8)
sys/modules/cc/cc_hd Makefile
sys/netinet/cc cc_hd.c
Log:
SVN rev 222412 on 2011-05-28 08:32:17Z by lstewart
MFC 218153:
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
Revision Changes Path
1.6.2.6 +1 -0 src/sys/modules/cc/Makefile
1.1.2.2 +9 -0 src/sys/modules/cc/cc_hd/Makefile (new)
1.2.2.2 +254 -0 src/sys/netinet/cc/cc_hd.c (new)
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