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319182 |
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30-May-2017 |
ngie |
MFC r314651,r318439,r318440:
r314651:
sys/modules: normalize .CURDIR-relative paths to SRCTOP
This simplifies make output/logic
Tested with: `cd sys/modules; make ALL_MODULES=` on amd64
r318439:
Normalize .PATH on SRCTOP
This will help Jenkins dedupe 9 warnings between the static build and the module build of ipsec(4).
Missed in SRCTOP conversion in r314651.
MFC with: r314651
r318440:
Normalize SYSDIR on SRCTOP instead of .CURDIR
This is being done to simplify pathing for CFLAGS and source files.
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218153 |
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01-Feb-2011 |
lstewart |
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
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