Hi all,
The first chunk of work from the FreeBSD Foundation sponsored "Improving
the FreeBSD TCP Implementation" project [1] is ready for some public
review and testing. Being my first project related email, I'll point out
to anyone interested that you can track the overall project via [2,3].
TCP appropriate byte counting (ABC) [4] addresses a congestion control
related issue introduced by the early TCP specifications. It suggests
increasing the congestion window by the number of bytes acknowledged by
a TCP ACK, as opposed to the current scheme which relies on an
approximation driven by ACK clocking.
ABC will most commonly benefit FreeBSD by improving TCP sender
performance when communicating with a delayed acknowledgement enabled
receiver.
The patch against 8-CURRENT svn rev 186471 can be found at [5] along
with a readme [6] covering all the necessary juicy bits in more detail.
I welcome all feedback and reports of both success or failure. I'm
currently working on analysing the small-scale dynamic behaviour effects
of the patch in detail, so I'm not asking you to go into minute detail
with your testing.
I'd like to hear that running with an ABC enabled kernel allows TCP to
work as it did previously and is not negatively impacting throughput for
any particular TCP workloads you have available for testing.
I aim to commit this within the next week or so assuming nothing bad
turns up in this round of testing.
Cheers,
Lawrence
http://caia.swin.edu.au/
[1] http://www.freebsdfoundation.org/project%20announcements.shtml#Lawrence
[2] http://svn.freebsd.org/viewvc/base/projects/tcp_ffcaia2008_8.x/
[3] http://lists.freebsd.org/mailman/listinfo/svn-src-projects
[4] http://www.rfc-editor.org/rfc/rfc3465.txt
[5]
http://people.freebsd.org/~lstewart/patches/tcp_ffcaia2008/tcp_abc_8.x.r186471.patch
[6]
http://people.freebsd.org/~lstewart/patches/tcp_ffcaia2008/tcp_abc_8.x.r186471.patch.readme
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