Thanks to each of you.
On Dec 18, 2007, at 4:55 AM, Andre Oppermann wrote:
Lawrence Stewart wrote:
Hi all,
We've been involved in a research project to implement and test an
emerging TCP congestion control algorithm under FreeBSD. As a part of
this, we've put together a patch for FreeBSD 7.0-BETA4 that
modularises
the congestion control code in the TCP stack. It allows for new
congestion control algorithms to be developed as loadable kernel
modules.
This improves FreeBSD's usefulness as a TCP research platform and
makes
it easier to customise the stack for specific scenarios like high
bandwidth, long delay paths.
There is an accompanying technical report "Light-Weight Modular
TCP Congestion Control for FreeBSD 7" [1] that covers the design,
features, kernel interface and usage of the framework. Also on our
website is
a beta release of a module that implements the H-TCP[2] congestion
control
algorithm proposed by the Hamilton Institute.
We believe that modular congestion control is a worthwhile
addition to
FreeBSD. We've performed significant internal testing and there are
currently no known issues or regressions with the implementation
compared to a 'vanilla' FreeBSD 7.0-BETA4 kernel. We would welcome
further review and testing from the wider community in the hope of
getting this
patch folded into FreeBSD 8-CURRENT.
SIFTR [3], our tool for monitoring FreeBSD kernel TCP connection
state, has also
received a minor update to v1.1.5, with the addition of 6 new,
useful variables.
All code and documentation is available on our website[3].
I've started to completely overhaul tcp_input and tcp_output
including separating out the congestion control. Actually it
is similiar to the way you seem to do it.
A quick glance at your patch shows a couple of style issues
and a complete lack of locking.
Let me get you a Perforce account so we can develop and complete
this work together. I'll create a Perforce branch and import my
code and work in progress.
--
Andre
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